{"version":3,"file":"index.js","sources":["../src/util/whitespace.js","../src/util/location.js","../src/parser/base.js","../src/parser/comments.js","../src/parser/error-codes.js","../src/parser/error-message.js","../src/parser/error.js","../src/plugins/estree.js","../src/tokenizer/context.js","../src/tokenizer/types.js","../../babel-helper-validator-identifier/src/identifier.ts","../../babel-helper-validator-identifier/src/keyword.ts","../src/util/identifier.js","../src/util/scopeflags.js","../src/util/scope.js","../src/plugins/flow/scope.js","../src/tokenizer/state.js","../src/tokenizer/index.js","../src/util/class-scope.js","../src/util/expression-scope.js","../src/util/production-parameter.js","../src/parser/util.js","../src/parser/node.js","../src/plugins/flow/index.js","../src/plugins/jsx/xhtml.js","../src/plugins/jsx/index.js","../src/plugins/typescript/scope.js","../src/plugins/typescript/index.js","../src/plugins/placeholders.js","../src/plugins/v8intrinsic.js","../src/plugin-utils.js","../src/options.js","../src/parser/lval.js","../src/parser/expression.js","../src/parser/statement.js","../src/parser/index.js","../src/index.js"],"sourcesContent":["// @flow\n\nimport * as charCodes from \"charcodes\";\n\n// Matches a whole line break (where CRLF is considered a single\n// line break). Used to count lines.\nexport const lineBreak = /\\r\\n?|[\\n\\u2028\\u2029]/;\nexport const lineBreakG = new RegExp(lineBreak.source, \"g\");\n\n// https://tc39.github.io/ecma262/#sec-line-terminators\nexport function isNewLine(code: number): boolean {\n switch (code) {\n case charCodes.lineFeed:\n case charCodes.carriageReturn:\n case charCodes.lineSeparator:\n case charCodes.paragraphSeparator:\n return true;\n\n default:\n return false;\n }\n}\n\nexport const skipWhiteSpace = /(?:\\s|\\/\\/.*|\\/\\*[^]*?\\*\\/)*/g;\n\nexport const skipWhiteSpaceInLine =\n /(?:[^\\S\\n\\r\\u2028\\u2029]|\\/\\/.*|\\/\\*.*?\\*\\/)*/y;\n\n// Skip whitespace and single-line comments, including /* no newline here */.\n// After this RegExp matches, its lastIndex points to a line terminator, or\n// the start of multi-line comment (which is effectively a line terminator),\n// or the end of string.\nexport const skipWhiteSpaceToLineBreak = new RegExp(\n // Unfortunately JS doesn't support Perl's atomic /(?>pattern)/ or\n // possessive quantifiers, so we use a trick to prevent backtracking\n // when the look-ahead for line terminator fails.\n \"(?=(\" +\n // Capture the whitespace and comments that should be skipped inside\n // a look-ahead assertion, and then re-match the group as a unit.\n skipWhiteSpaceInLine.source +\n \"))\\\\1\" +\n // Look-ahead for either line terminator, start of multi-line comment,\n // or end of string.\n /(?=[\\n\\r\\u2028\\u2029]|\\/\\*(?!.*?\\*\\/)|$)/.source,\n \"y\", // sticky\n);\n\n// https://tc39.github.io/ecma262/#sec-white-space\nexport function isWhitespace(code: number): boolean {\n switch (code) {\n case 0x0009: // CHARACTER TABULATION\n case 0x000b: // LINE TABULATION\n case 0x000c: // FORM FEED\n case charCodes.space:\n case charCodes.nonBreakingSpace:\n case charCodes.oghamSpaceMark:\n case 0x2000: // EN QUAD\n case 0x2001: // EM QUAD\n case 0x2002: // EN SPACE\n case 0x2003: // EM SPACE\n case 0x2004: // THREE-PER-EM SPACE\n case 0x2005: // FOUR-PER-EM SPACE\n case 0x2006: // SIX-PER-EM SPACE\n case 0x2007: // FIGURE SPACE\n case 0x2008: // PUNCTUATION SPACE\n case 0x2009: // THIN SPACE\n case 0x200a: // HAIR SPACE\n case 0x202f: // NARROW NO-BREAK SPACE\n case 0x205f: // MEDIUM MATHEMATICAL SPACE\n case 0x3000: // IDEOGRAPHIC SPACE\n case 0xfeff: // ZERO WIDTH NO-BREAK SPACE\n return true;\n\n default:\n return false;\n }\n}\n","// @flow\n\nimport { lineBreakG } from \"./whitespace\";\n\nexport type Pos = {\n start: number,\n};\n\n// These are used when `options.locations` is on, for the\n// `startLoc` and `endLoc` properties.\n\nexport class Position {\n line: number;\n column: number;\n\n constructor(line: number, col: number) {\n this.line = line;\n this.column = col;\n }\n}\n\nexport class SourceLocation {\n start: Position;\n end: Position;\n filename: string;\n identifierName: ?string;\n\n constructor(start: Position, end?: Position) {\n this.start = start;\n // $FlowIgnore (may start as null, but initialized later)\n this.end = end;\n }\n}\n\n// The `getLineInfo` function is mostly useful when the\n// `locations` option is off (for performance reasons) and you\n// want to find the line/column position for a given character\n// offset. `input` should be the code string that the offset refers\n// into.\n\nexport function getLineInfo(input: string, offset: number): Position {\n let line = 1;\n let lineStart = 0;\n let match;\n lineBreakG.lastIndex = 0;\n while ((match = lineBreakG.exec(input)) && match.index < offset) {\n line++;\n lineStart = lineBreakG.lastIndex;\n }\n\n return new Position(line, offset - lineStart);\n}\n","// @flow\n\nimport type { Options } from \"../options\";\nimport type State from \"../tokenizer/state\";\nimport type { PluginsMap } from \"./index\";\nimport type ScopeHandler from \"../util/scope\";\nimport type ExpressionScopeHandler from \"../util/expression-scope\";\nimport type ClassScopeHandler from \"../util/class-scope\";\nimport type ProductionParameterHandler from \"../util/production-parameter\";\n\nexport default class BaseParser {\n // Properties set by constructor in index.js\n declare options: Options;\n declare inModule: boolean;\n declare scope: ScopeHandler<*>;\n declare classScope: ClassScopeHandler;\n declare prodParam: ProductionParameterHandler;\n declare expressionScope: ExpressionScopeHandler;\n declare plugins: PluginsMap;\n declare filename: ?string;\n // Names of exports store. `default` is stored as a name for both\n // `export default foo;` and `export { foo as default };`.\n declare exportedIdentifiers: Set;\n sawUnambiguousESM: boolean = false;\n ambiguousScriptDifferentAst: boolean = false;\n\n // Initialized by Tokenizer\n declare state: State;\n // input and length are not in state as they are constant and we do\n // not want to ever copy them, which happens if state gets cloned\n declare input: string;\n declare length: number;\n\n hasPlugin(name: string): boolean {\n return this.plugins.has(name);\n }\n\n getPluginOption(plugin: string, name: string) {\n // $FlowIssue\n if (this.hasPlugin(plugin)) return this.plugins.get(plugin)[name];\n }\n}\n","// @flow\n\n/*:: declare var invariant; */\n\nimport BaseParser from \"./base\";\nimport type { Comment, Node } from \"../types\";\nimport * as charCodes from \"charcodes\";\n\n/**\n * A whitespace token containing comments\n * @typedef CommentWhitespace\n * @type {object}\n * @property {number} start - the start of the whitespace token.\n * @property {number} end - the end of the whitespace token.\n * @property {Array} comments - the containing comments\n * @property {Node | null} leadingNode - the immediately preceding AST node of the whitespace token\n * @property {Node | null} trailingNode - the immediately following AST node of the whitespace token\n * @property {Node | null} containingNode - the innermost AST node containing the whitespace\n * with minimal size (|end - start|)\n */\nexport type CommentWhitespace = {\n start: number,\n end: number,\n comments: Array,\n leadingNode: Node | null,\n trailingNode: Node | null,\n containingNode: Node | null,\n};\n\n/**\n * Merge comments with node's trailingComments or assign comments to be\n * trailingComments. New comments will be placed before old comments\n * because the commentStack is enumerated reversely.\n *\n * @param {Node} node\n * @param {Array} comments\n */\nfunction setTrailingComments(node: Node, comments: Array) {\n if (node.trailingComments === undefined) {\n node.trailingComments = comments;\n } else {\n node.trailingComments.unshift(...comments);\n }\n}\n\n/**\n * Merge comments with node's leadingComments or assign comments to be\n * leadingComments. New comments will be placed before old comments\n * because the commentStack is enumerated reversely.\n *\n * @param {Node} node\n * @param {Array} comments\n */\nfunction setLeadingComments(node: Node, comments: Array) {\n if (node.leadingComments === undefined) {\n node.leadingComments = comments;\n } else {\n node.leadingComments.unshift(...comments);\n }\n}\n\n/**\n * Merge comments with node's innerComments or assign comments to be\n * innerComments. New comments will be placed before old comments\n * because the commentStack is enumerated reversely.\n *\n * @param {Node} node\n * @param {Array} comments\n */\nexport function setInnerComments(node: Node, comments: Array) {\n if (node.innerComments === undefined) {\n node.innerComments = comments;\n } else {\n node.innerComments.unshift(...comments);\n }\n}\n\n/**\n * Given node and elements array, if elements has non-null element,\n * merge comments to its trailingComments, otherwise merge comments\n * to node's innerComments\n *\n * @param {Node} node\n * @param {Array} elements\n * @param {Array} comments\n */\nfunction adjustInnerComments(\n node: Node,\n elements: Array,\n commentWS: CommentWhitespace,\n) {\n let lastElement = null;\n let i = elements.length;\n while (lastElement === null && i > 0) {\n lastElement = elements[--i];\n }\n if (lastElement === null || lastElement.start > commentWS.start) {\n setInnerComments(node, commentWS.comments);\n } else {\n setTrailingComments(lastElement, commentWS.comments);\n }\n}\n\n/** @class CommentsParser */\nexport default class CommentsParser extends BaseParser {\n addComment(comment: Comment): void {\n if (this.filename) comment.loc.filename = this.filename;\n this.state.comments.push(comment);\n }\n\n /**\n * Given a newly created AST node _n_, attach _n_ to a comment whitespace _w_ if applicable\n * {@see {@link CommentWhitespace}}\n *\n * @param {Node} node\n * @returns {void}\n * @memberof CommentsParser\n */\n processComment(node: Node): void {\n const { commentStack } = this.state;\n const commentStackLength = commentStack.length;\n if (commentStackLength === 0) return;\n let i = commentStackLength - 1;\n const lastCommentWS = commentStack[i];\n\n if (lastCommentWS.start === node.end) {\n lastCommentWS.leadingNode = node;\n i--;\n }\n\n const { start: nodeStart } = node;\n // invariant: for all 0 <= j <= i, let c = commentStack[j], c must satisfy c.end < node.end\n for (; i >= 0; i--) {\n const commentWS = commentStack[i];\n const commentEnd = commentWS.end;\n if (commentEnd > nodeStart) {\n // by definition of commentWhiteSpace, this implies commentWS.start > nodeStart\n // so node can be a containingNode candidate. At this time we can finalize the comment\n // whitespace, because\n // 1) its leadingNode or trailingNode, if exists, will not change\n // 2) its containingNode have been assigned and will not change because it is the\n // innermost minimal-sized AST node\n commentWS.containingNode = node;\n this.finalizeComment(commentWS);\n commentStack.splice(i, 1);\n } else {\n if (commentEnd === nodeStart) {\n commentWS.trailingNode = node;\n }\n // stop the loop when commentEnd <= nodeStart\n break;\n }\n }\n }\n\n /**\n * Assign the comments of comment whitespaces to related AST nodes.\n * Also adjust innerComments following trailing comma.\n *\n * @memberof CommentsParser\n */\n finalizeComment(commentWS: CommentWhitespace) {\n const { comments } = commentWS;\n if (commentWS.leadingNode !== null || commentWS.trailingNode !== null) {\n if (commentWS.leadingNode !== null) {\n setTrailingComments(commentWS.leadingNode, comments);\n }\n if (commentWS.trailingNode !== null) {\n setLeadingComments(commentWS.trailingNode, comments);\n }\n } else {\n /*:: invariant(commentWS.containingNode !== null) */\n const { containingNode: node, start: commentStart } = commentWS;\n if (this.input.charCodeAt(commentStart - 1) === charCodes.comma) {\n // If a commentWhitespace follows a comma and the containingNode allows\n // list structures with trailing comma, merge it to the trailingComment\n // of the last non-null list element\n switch (node.type) {\n case \"ObjectExpression\":\n case \"ObjectPattern\":\n case \"RecordExpression\":\n adjustInnerComments(node, node.properties, commentWS);\n break;\n case \"CallExpression\":\n case \"OptionalCallExpression\":\n adjustInnerComments(node, node.arguments, commentWS);\n break;\n case \"FunctionDeclaration\":\n case \"FunctionExpression\":\n case \"ArrowFunctionExpression\":\n case \"ObjectMethod\":\n case \"ClassMethod\":\n case \"ClassPrivateMethod\":\n adjustInnerComments(node, node.params, commentWS);\n break;\n case \"ArrayExpression\":\n case \"ArrayPattern\":\n case \"TupleExpression\":\n adjustInnerComments(node, node.elements, commentWS);\n break;\n case \"ExportNamedDeclaration\":\n case \"ImportDeclaration\":\n adjustInnerComments(node, node.specifiers, commentWS);\n break;\n default: {\n setInnerComments(node, comments);\n }\n }\n } else {\n setInnerComments(node, comments);\n }\n }\n }\n\n /**\n * Drains remaning commentStack and applies finalizeComment\n * to each comment whitespace. Used only in parseExpression\n * where the top level AST node is _not_ Program\n * {@see {@link CommentsParser#finalizeComment}}\n *\n * @memberof CommentsParser\n */\n finalizeRemainingComments() {\n const { commentStack } = this.state;\n for (let i = commentStack.length - 1; i >= 0; i--) {\n this.finalizeComment(commentStack[i]);\n }\n this.state.commentStack = [];\n }\n\n /**\n * Reset previous node trailing comments. Used in object / class\n * property parsing. We parse `async`, `static`, `set` and `get`\n * as an identifier but may reinterepret it into an async/static/accessor\n * method later. In this case the identifier is not part of the AST and we\n * should sync the knowledge to commentStacks\n *\n * For example, when parsing */\n // async /* 1 */ function f() {}\n /*\n * the comment whitespace \"* 1 *\" has leading node Identifier(async). When\n * we see the function token, we create a Function node and mark \"* 1 *\" as\n * inner comments. So \"* 1 *\" should be detached from the Identifier node.\n *\n * @param {N.Node} node the last finished AST node _before_ current token\n * @returns\n * @memberof CommentsParser\n */\n resetPreviousNodeTrailingComments(node: Node) {\n const { commentStack } = this.state;\n const { length } = commentStack;\n if (length === 0) return;\n const commentWS = commentStack[length - 1];\n if (commentWS.leadingNode === node) {\n commentWS.leadingNode = null;\n }\n }\n\n /**\n * Attach a node to the comment whitespaces right before/after\n * the given range.\n *\n * This is used to properly attach comments around parenthesized\n * expressions as leading/trailing comments of the inner expression.\n *\n * @param {Node} node\n * @param {number} start\n * @param {number} end\n */\n takeSurroundingComments(node: Node, start: number, end: number) {\n const { commentStack } = this.state;\n const commentStackLength = commentStack.length;\n if (commentStackLength === 0) return;\n let i = commentStackLength - 1;\n\n for (; i >= 0; i--) {\n const commentWS = commentStack[i];\n const commentEnd = commentWS.end;\n const commentStart = commentWS.start;\n\n if (commentStart === end) {\n commentWS.leadingNode = node;\n } else if (commentEnd === start) {\n commentWS.trailingNode = node;\n } else if (commentEnd < start) {\n break;\n }\n }\n }\n}\n","// @flow\n\nexport const ErrorCodes = Object.freeze({\n SyntaxError: \"BABEL_PARSER_SYNTAX_ERROR\",\n SourceTypeModuleError: \"BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED\",\n});\n\nexport type ErrorCode = $Values;\n","// @flow\n\nimport { makeErrorTemplates, ErrorCodes } from \"./error\";\n\n/* eslint sort-keys: \"error\" */\n\n/**\n * @module parser/error-message\n */\n\n// The Errors key follows https://cs.chromium.org/chromium/src/v8/src/common/message-template.h unless it does not exist\nexport const ErrorMessages = makeErrorTemplates(\n {\n AccessorIsGenerator: \"A %0ter cannot be a generator.\",\n ArgumentsInClass:\n \"'arguments' is only allowed in functions and class methods.\",\n AsyncFunctionInSingleStatementContext:\n \"Async functions can only be declared at the top level or inside a block.\",\n AwaitBindingIdentifier:\n \"Can not use 'await' as identifier inside an async function.\",\n AwaitBindingIdentifierInStaticBlock:\n \"Can not use 'await' as identifier inside a static block.\",\n AwaitExpressionFormalParameter:\n \"'await' is not allowed in async function parameters.\",\n AwaitNotInAsyncContext:\n \"'await' is only allowed within async functions and at the top levels of modules.\",\n AwaitNotInAsyncFunction: \"'await' is only allowed within async functions.\",\n BadGetterArity: \"A 'get' accesor must not have any formal parameters.\",\n BadSetterArity: \"A 'set' accesor must have exactly one formal parameter.\",\n BadSetterRestParameter:\n \"A 'set' accesor function argument must not be a rest parameter.\",\n ConstructorClassField: \"Classes may not have a field named 'constructor'.\",\n ConstructorClassPrivateField:\n \"Classes may not have a private field named '#constructor'.\",\n ConstructorIsAccessor: \"Class constructor may not be an accessor.\",\n ConstructorIsAsync: \"Constructor can't be an async function.\",\n ConstructorIsGenerator: \"Constructor can't be a generator.\",\n DeclarationMissingInitializer: \"'%0' require an initialization value.\",\n DecoratorBeforeExport:\n \"Decorators must be placed *before* the 'export' keyword. You can set the 'decoratorsBeforeExport' option to false to use the 'export @decorator class {}' syntax.\",\n DecoratorConstructor:\n \"Decorators can't be used with a constructor. Did you mean '@dec class { ... }'?\",\n DecoratorExportClass:\n \"Using the export keyword between a decorator and a class is not allowed. Please use `export @dec class` instead.\",\n DecoratorSemicolon: \"Decorators must not be followed by a semicolon.\",\n DecoratorStaticBlock: \"Decorators can't be used with a static block.\",\n DeletePrivateField: \"Deleting a private field is not allowed.\",\n DestructureNamedImport:\n \"ES2015 named imports do not destructure. Use another statement for destructuring after the import.\",\n DuplicateConstructor: \"Duplicate constructor in the same class.\",\n DuplicateDefaultExport: \"Only one default export allowed per module.\",\n DuplicateExport:\n \"`%0` has already been exported. Exported identifiers must be unique.\",\n DuplicateProto: \"Redefinition of __proto__ property.\",\n DuplicateRegExpFlags: \"Duplicate regular expression flag.\",\n ElementAfterRest: \"Rest element must be last element.\",\n EscapedCharNotAnIdentifier: \"Invalid Unicode escape.\",\n ExportBindingIsString:\n \"A string literal cannot be used as an exported binding without `from`.\\n- Did you mean `export { '%0' as '%1' } from 'some-module'`?\",\n ExportDefaultFromAsIdentifier:\n \"'from' is not allowed as an identifier after 'export default'.\",\n ForInOfLoopInitializer:\n \"'%0' loop variable declaration may not have an initializer.\",\n ForOfAsync: \"The left-hand side of a for-of loop may not be 'async'.\",\n ForOfLet: \"The left-hand side of a for-of loop may not start with 'let'.\",\n GeneratorInSingleStatementContext:\n \"Generators can only be declared at the top level or inside a block.\",\n IllegalBreakContinue: \"Unsyntactic %0.\",\n IllegalLanguageModeDirective:\n \"Illegal 'use strict' directive in function with non-simple parameter list.\",\n IllegalReturn: \"'return' outside of function.\",\n ImportBindingIsString:\n 'A string literal cannot be used as an imported binding.\\n- Did you mean `import { \"%0\" as foo }`?',\n ImportCallArgumentTrailingComma:\n \"Trailing comma is disallowed inside import(...) arguments.\",\n ImportCallArity: \"`import()` requires exactly %0.\",\n ImportCallNotNewExpression: \"Cannot use new with import(...).\",\n ImportCallSpreadArgument: \"`...` is not allowed in `import()`.\",\n InvalidBigIntLiteral: \"Invalid BigIntLiteral.\",\n InvalidCodePoint: \"Code point out of bounds.\",\n InvalidDecimal: \"Invalid decimal.\",\n InvalidDigit: \"Expected number in radix %0.\",\n InvalidEscapeSequence: \"Bad character escape sequence.\",\n InvalidEscapeSequenceTemplate: \"Invalid escape sequence in template.\",\n InvalidEscapedReservedWord: \"Escape sequence in keyword %0.\",\n InvalidIdentifier: \"Invalid identifier %0.\",\n InvalidLhs: \"Invalid left-hand side in %0.\",\n InvalidLhsBinding: \"Binding invalid left-hand side in %0.\",\n InvalidNumber: \"Invalid number.\",\n InvalidOrMissingExponent:\n \"Floating-point numbers require a valid exponent after the 'e'.\",\n InvalidOrUnexpectedToken: \"Unexpected character '%0'.\",\n InvalidParenthesizedAssignment: \"Invalid parenthesized assignment pattern.\",\n InvalidPrivateFieldResolution: \"Private name #%0 is not defined.\",\n InvalidPropertyBindingPattern: \"Binding member expression.\",\n InvalidRecordProperty:\n \"Only properties and spread elements are allowed in record definitions.\",\n InvalidRestAssignmentPattern: \"Invalid rest operator's argument.\",\n LabelRedeclaration: \"Label '%0' is already declared.\",\n LetInLexicalBinding:\n \"'let' is not allowed to be used as a name in 'let' or 'const' declarations.\",\n LineTerminatorBeforeArrow: \"No line break is allowed before '=>'.\",\n MalformedRegExpFlags: \"Invalid regular expression flag.\",\n MissingClassName: \"A class name is required.\",\n MissingEqInAssignment:\n \"Only '=' operator can be used for specifying default value.\",\n MissingSemicolon: \"Missing semicolon.\",\n MissingUnicodeEscape: \"Expecting Unicode escape sequence \\\\uXXXX.\",\n MixingCoalesceWithLogical:\n \"Nullish coalescing operator(??) requires parens when mixing with logical operators.\",\n ModuleAttributeDifferentFromType:\n \"The only accepted module attribute is `type`.\",\n ModuleAttributeInvalidValue:\n \"Only string literals are allowed as module attribute values.\",\n ModuleAttributesWithDuplicateKeys:\n 'Duplicate key \"%0\" is not allowed in module attributes.',\n ModuleExportNameHasLoneSurrogate:\n \"An export name cannot include a lone surrogate, found '\\\\u%0'.\",\n ModuleExportUndefined: \"Export '%0' is not defined.\",\n MultipleDefaultsInSwitch: \"Multiple default clauses.\",\n NewlineAfterThrow: \"Illegal newline after throw.\",\n NoCatchOrFinally: \"Missing catch or finally clause.\",\n NumberIdentifier: \"Identifier directly after number.\",\n NumericSeparatorInEscapeSequence:\n \"Numeric separators are not allowed inside unicode escape sequences or hex escape sequences.\",\n ObsoleteAwaitStar:\n \"'await*' has been removed from the async functions proposal. Use Promise.all() instead.\",\n OptionalChainingNoNew:\n \"Constructors in/after an Optional Chain are not allowed.\",\n OptionalChainingNoTemplate:\n \"Tagged Template Literals are not allowed in optionalChain.\",\n OverrideOnConstructor:\n \"'override' modifier cannot appear on a constructor declaration.\",\n ParamDupe: \"Argument name clash.\",\n PatternHasAccessor: \"Object pattern can't contain getter or setter.\",\n PatternHasMethod: \"Object pattern can't contain methods.\",\n // This error is only used by the smart-mix proposal\n PipeBodyIsTighter:\n \"Unexpected %0 after pipeline body; any %0 expression acting as Hack-style pipe body must be parenthesized due to its loose operator precedence.\",\n PipeTopicRequiresHackPipes:\n 'Topic reference is used, but the pipelineOperator plugin was not passed a \"proposal\": \"hack\" or \"smart\" option.',\n PipeTopicUnbound:\n \"Topic reference is unbound; it must be inside a pipe body.\",\n PipeTopicUnconfiguredToken:\n 'Invalid topic token %0. In order to use %0 as a topic reference, the pipelineOperator plugin must be configured with { \"proposal\": \"hack\", \"topicToken\": \"%0\" }.',\n PipeTopicUnused:\n \"Hack-style pipe body does not contain a topic reference; Hack-style pipes must use topic at least once.\",\n PipeUnparenthesizedBody:\n \"Hack-style pipe body cannot be an unparenthesized %0 expression; please wrap it in parentheses.\",\n\n // Messages whose codes start with “Pipeline” or “PrimaryTopic”\n // are retained for backwards compatibility\n // with the deprecated smart-mix pipe operator proposal plugin.\n // They are subject to removal in a future major version.\n PipelineBodyNoArrow:\n 'Unexpected arrow \"=>\" after pipeline body; arrow function in pipeline body must be parenthesized.',\n PipelineBodySequenceExpression:\n \"Pipeline body may not be a comma-separated sequence expression.\",\n PipelineHeadSequenceExpression:\n \"Pipeline head should not be a comma-separated sequence expression.\",\n PipelineTopicUnused:\n \"Pipeline is in topic style but does not use topic reference.\",\n PrimaryTopicNotAllowed:\n \"Topic reference was used in a lexical context without topic binding.\",\n PrimaryTopicRequiresSmartPipeline:\n 'Topic reference is used, but the pipelineOperator plugin was not passed a \"proposal\": \"hack\" or \"smart\" option.',\n\n PrivateInExpectedIn:\n \"Private names are only allowed in property accesses (`obj.#%0`) or in `in` expressions (`#%0 in obj`).\",\n PrivateNameRedeclaration: \"Duplicate private name #%0.\",\n RecordExpressionBarIncorrectEndSyntaxType:\n \"Record expressions ending with '|}' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'.\",\n RecordExpressionBarIncorrectStartSyntaxType:\n \"Record expressions starting with '{|' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'.\",\n RecordExpressionHashIncorrectStartSyntaxType:\n \"Record expressions starting with '#{' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'hash'.\",\n RecordNoProto: \"'__proto__' is not allowed in Record expressions.\",\n RestTrailingComma: \"Unexpected trailing comma after rest element.\",\n SloppyFunction:\n \"In non-strict mode code, functions can only be declared at top level, inside a block, or as the body of an if statement.\",\n StaticPrototype: \"Classes may not have static property named prototype.\",\n StrictDelete: \"Deleting local variable in strict mode.\",\n StrictEvalArguments: \"Assigning to '%0' in strict mode.\",\n StrictEvalArgumentsBinding: \"Binding '%0' in strict mode.\",\n StrictFunction:\n \"In strict mode code, functions can only be declared at top level or inside a block.\",\n StrictNumericEscape:\n \"The only valid numeric escape in strict mode is '\\\\0'.\",\n StrictOctalLiteral: \"Legacy octal literals are not allowed in strict mode.\",\n StrictWith: \"'with' in strict mode.\",\n SuperNotAllowed:\n \"`super()` is only valid inside a class constructor of a subclass. Maybe a typo in the method name ('constructor') or not extending another class?\",\n SuperPrivateField: \"Private fields can't be accessed on super.\",\n TrailingDecorator: \"Decorators must be attached to a class element.\",\n TupleExpressionBarIncorrectEndSyntaxType:\n \"Tuple expressions ending with '|]' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'.\",\n TupleExpressionBarIncorrectStartSyntaxType:\n \"Tuple expressions starting with '[|' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'.\",\n TupleExpressionHashIncorrectStartSyntaxType:\n \"Tuple expressions starting with '#[' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'hash'.\",\n UnexpectedArgumentPlaceholder: \"Unexpected argument placeholder.\",\n UnexpectedAwaitAfterPipelineBody:\n 'Unexpected \"await\" after pipeline body; await must have parentheses in minimal proposal.',\n UnexpectedDigitAfterHash: \"Unexpected digit after hash token.\",\n UnexpectedImportExport:\n \"'import' and 'export' may only appear at the top level.\",\n UnexpectedKeyword: \"Unexpected keyword '%0'.\",\n UnexpectedLeadingDecorator:\n \"Leading decorators must be attached to a class declaration.\",\n UnexpectedLexicalDeclaration:\n \"Lexical declaration cannot appear in a single-statement context.\",\n UnexpectedNewTarget:\n \"`new.target` can only be used in functions or class properties.\",\n UnexpectedNumericSeparator:\n \"A numeric separator is only allowed between two digits.\",\n UnexpectedPrivateField:\n \"Private names can only be used as the name of a class element (i.e. class C { #p = 42; #m() {} } )\\n or a property of member expression (i.e. this.#p).\",\n UnexpectedReservedWord: \"Unexpected reserved word '%0'.\",\n UnexpectedSuper: \"'super' is only allowed in object methods and classes.\",\n UnexpectedToken: \"Unexpected token '%0'.\",\n UnexpectedTokenUnaryExponentiation:\n \"Illegal expression. Wrap left hand side or entire exponentiation in parentheses.\",\n UnsupportedBind: \"Binding should be performed on object property.\",\n UnsupportedDecoratorExport:\n \"A decorated export must export a class declaration.\",\n UnsupportedDefaultExport:\n \"Only expressions, functions or classes are allowed as the `default` export.\",\n UnsupportedImport:\n \"`import` can only be used in `import()` or `import.meta`.\",\n UnsupportedMetaProperty: \"The only valid meta property for %0 is %0.%1.\",\n UnsupportedParameterDecorator:\n \"Decorators cannot be used to decorate parameters.\",\n UnsupportedPropertyDecorator:\n \"Decorators cannot be used to decorate object literal properties.\",\n UnsupportedSuper:\n \"'super' can only be used with function calls (i.e. super()) or in property accesses (i.e. super.prop or super[prop]).\",\n UnterminatedComment: \"Unterminated comment.\",\n UnterminatedRegExp: \"Unterminated regular expression.\",\n UnterminatedString: \"Unterminated string constant.\",\n UnterminatedTemplate: \"Unterminated template.\",\n VarRedeclaration: \"Identifier '%0' has already been declared.\",\n YieldBindingIdentifier:\n \"Can not use 'yield' as identifier inside a generator.\",\n YieldInParameter: \"Yield expression is not allowed in formal parameters.\",\n ZeroDigitNumericSeparator:\n \"Numeric separator can not be used after leading 0.\",\n },\n /* code */ ErrorCodes.SyntaxError,\n);\n\nexport const SourceTypeModuleErrorMessages = makeErrorTemplates(\n {\n ImportMetaOutsideModule: `import.meta may appear only with 'sourceType: \"module\"'`,\n ImportOutsideModule: `'import' and 'export' may appear only with 'sourceType: \"module\"'`,\n },\n /* code */ ErrorCodes.SourceTypeModuleError,\n);\n","// @flow\n/* eslint sort-keys: \"error\" */\nimport { getLineInfo, type Position } from \"../util/location\";\nimport CommentsParser from \"./comments\";\nimport { type ErrorCode, ErrorCodes } from \"./error-codes\";\n\n// This function is used to raise exceptions on parse errors. It\n// takes an offset integer (into the current `input`) to indicate\n// the location of the error, attaches the position to the end\n// of the error message, and then raises a `SyntaxError` with that\n// message.\n\ntype ErrorContext = {\n pos: number,\n loc: Position,\n missingPlugin?: Array,\n code?: string,\n reasonCode?: String,\n};\nexport type ParsingError = SyntaxError & ErrorContext;\n\nexport type ErrorTemplate = {\n code: ErrorCode,\n template: string,\n reasonCode: string,\n};\nexport type ErrorTemplates = {\n [key: string]: ErrorTemplate,\n};\n\ntype SyntaxPlugin = \"flow\" | \"typescript\" | \"jsx\" | typeof undefined;\n\nfunction keepReasonCodeCompat(reasonCode: string, syntaxPlugin: SyntaxPlugin) {\n if (!process.env.BABEL_8_BREAKING) {\n // For consistency in TypeScript and Flow error codes\n if (syntaxPlugin === \"flow\" && reasonCode === \"PatternIsOptional\") {\n return \"OptionalBindingPattern\";\n }\n }\n return reasonCode;\n}\n\nexport function makeErrorTemplates(\n messages: {\n [key: string]: string,\n },\n code: ErrorCode,\n syntaxPlugin?: SyntaxPlugin,\n): ErrorTemplates {\n const templates: ErrorTemplates = {};\n Object.keys(messages).forEach(reasonCode => {\n templates[reasonCode] = Object.freeze({\n code,\n reasonCode: keepReasonCodeCompat(reasonCode, syntaxPlugin),\n template: messages[reasonCode],\n });\n });\n return Object.freeze(templates);\n}\n\nexport { ErrorCodes };\nexport {\n ErrorMessages as Errors,\n SourceTypeModuleErrorMessages as SourceTypeModuleErrors,\n} from \"./error-message\";\n\nexport type raiseFunction = (number, ErrorTemplate, ...any) => void;\n\nexport default class ParserError extends CommentsParser {\n // Forward-declaration: defined in tokenizer/index.js\n /*::\n +isLookahead: boolean;\n */\n\n getLocationForPosition(pos: number): Position {\n let loc;\n if (pos === this.state.start) loc = this.state.startLoc;\n else if (pos === this.state.lastTokStart) loc = this.state.lastTokStartLoc;\n else if (pos === this.state.end) loc = this.state.endLoc;\n else if (pos === this.state.lastTokEnd) loc = this.state.lastTokEndLoc;\n else loc = getLineInfo(this.input, pos);\n\n return loc;\n }\n\n raise(\n pos: number,\n { code, reasonCode, template }: ErrorTemplate,\n ...params: any\n ): Error | empty {\n return this.raiseWithData(pos, { code, reasonCode }, template, ...params);\n }\n\n /**\n * Raise a parsing error on given position pos. If errorRecovery is true,\n * it will first search current errors and overwrite the error thrown on the exact\n * position before with the new error message. If errorRecovery is false, it\n * fallbacks to `raise`.\n *\n * @param {number} pos\n * @param {string} errorTemplate\n * @param {...any} params\n * @returns {(Error | empty)}\n * @memberof ParserError\n */\n raiseOverwrite(\n pos: number,\n { code, template }: ErrorTemplate,\n ...params: any\n ): Error | empty {\n const loc = this.getLocationForPosition(pos);\n const message =\n template.replace(/%(\\d+)/g, (_, i: number) => params[i]) +\n ` (${loc.line}:${loc.column})`;\n if (this.options.errorRecovery) {\n const errors = this.state.errors;\n for (let i = errors.length - 1; i >= 0; i--) {\n const error = errors[i];\n if (error.pos === pos) {\n return Object.assign(error, { message });\n } else if (error.pos < pos) {\n break;\n }\n }\n }\n return this._raise({ code, loc, pos }, message);\n }\n\n raiseWithData(\n pos: number,\n data?: {\n missingPlugin?: Array,\n code?: string,\n },\n errorTemplate: string,\n ...params: any\n ): Error | empty {\n const loc = this.getLocationForPosition(pos);\n const message =\n errorTemplate.replace(/%(\\d+)/g, (_, i: number) => params[i]) +\n ` (${loc.line}:${loc.column})`;\n return this._raise(Object.assign(({ loc, pos }: Object), data), message);\n }\n\n _raise(errorContext: ErrorContext, message: string): Error | empty {\n // $FlowIgnore\n const err: SyntaxError & ErrorContext = new SyntaxError(message);\n Object.assign(err, errorContext);\n if (this.options.errorRecovery) {\n if (!this.isLookahead) this.state.errors.push(err);\n return err;\n } else {\n throw err;\n }\n }\n}\n","// @flow\n\nimport { type TokenType } from \"../tokenizer/types\";\nimport type Parser from \"../parser\";\nimport type { ExpressionErrors } from \"../parser/util\";\nimport * as N from \"../types\";\nimport type { Position } from \"../util/location\";\nimport { Errors } from \"../parser/error\";\n\nexport default (superClass: Class): Class =>\n class extends superClass {\n parseRegExpLiteral({ pattern, flags }): N.Node {\n let regex = null;\n try {\n regex = new RegExp(pattern, flags);\n } catch (e) {\n // In environments that don't support these flags value will\n // be null as the regex can't be represented natively.\n }\n const node = this.estreeParseLiteral(regex);\n node.regex = { pattern, flags };\n\n return node;\n }\n\n parseBigIntLiteral(value: any): N.Node {\n // https://github.com/estree/estree/blob/master/es2020.md#bigintliteral\n let bigInt;\n try {\n // $FlowIgnore\n bigInt = BigInt(value);\n } catch {\n bigInt = null;\n }\n const node = this.estreeParseLiteral(bigInt);\n node.bigint = String(node.value || value);\n\n return node;\n }\n\n parseDecimalLiteral(value: any): N.Node {\n // https://github.com/estree/estree/blob/master/experimental/decimal.md\n // todo: use BigDecimal when node supports it.\n const decimal = null;\n const node = this.estreeParseLiteral(decimal);\n node.decimal = String(node.value || value);\n\n return node;\n }\n\n estreeParseLiteral(value: any) {\n return this.parseLiteral(value, \"Literal\");\n }\n\n parseStringLiteral(value: any): N.Node {\n return this.estreeParseLiteral(value);\n }\n\n parseNumericLiteral(value: any): any {\n return this.estreeParseLiteral(value);\n }\n\n parseNullLiteral(): N.Node {\n return this.estreeParseLiteral(null);\n }\n\n parseBooleanLiteral(value: boolean): N.BooleanLiteral {\n return this.estreeParseLiteral(value);\n }\n\n directiveToStmt(directive: N.Directive): N.ExpressionStatement {\n const directiveLiteral = directive.value;\n\n const stmt = this.startNodeAt(directive.start, directive.loc.start);\n const expression = this.startNodeAt(\n directiveLiteral.start,\n directiveLiteral.loc.start,\n );\n\n expression.value = directiveLiteral.extra.expressionValue;\n expression.raw = directiveLiteral.extra.raw;\n\n stmt.expression = this.finishNodeAt(\n expression,\n \"Literal\",\n directiveLiteral.end,\n directiveLiteral.loc.end,\n );\n stmt.directive = directiveLiteral.extra.raw.slice(1, -1);\n\n return this.finishNodeAt(\n stmt,\n \"ExpressionStatement\",\n directive.end,\n directive.loc.end,\n );\n }\n\n // ==================================\n // Overrides\n // ==================================\n\n initFunction(\n node: N.BodilessFunctionOrMethodBase,\n isAsync: ?boolean,\n ): void {\n super.initFunction(node, isAsync);\n node.expression = false;\n }\n\n checkDeclaration(node: N.Pattern | N.ObjectProperty): void {\n if (node != null && this.isObjectProperty(node)) {\n this.checkDeclaration(((node: any): N.EstreeProperty).value);\n } else {\n super.checkDeclaration(node);\n }\n }\n\n getObjectOrClassMethodParams(method: N.ObjectMethod | N.ClassMethod) {\n return ((method: any): N.EstreeProperty | N.EstreeMethodDefinition).value\n .params;\n }\n\n isValidDirective(stmt: N.Statement): boolean {\n return (\n stmt.type === \"ExpressionStatement\" &&\n stmt.expression.type === \"Literal\" &&\n typeof stmt.expression.value === \"string\" &&\n !stmt.expression.extra?.parenthesized\n );\n }\n\n stmtToDirective(stmt: N.Statement): N.Directive {\n const value = stmt.expression.value;\n const directive = super.stmtToDirective(stmt);\n\n // Record the expression value as in estree mode we want\n // the stmt to have the real value e.g. (\"use strict\") and\n // not the raw value e.g. (\"use\\\\x20strict\")\n this.addExtra(directive.value, \"expressionValue\", value);\n\n return directive;\n }\n\n parseBlockBody(\n node: N.BlockStatementLike,\n ...args: [?boolean, boolean, TokenType, void | (boolean => void)]\n ): void {\n super.parseBlockBody(node, ...args);\n\n const directiveStatements = node.directives.map(d =>\n this.directiveToStmt(d),\n );\n node.body = directiveStatements.concat(node.body);\n // $FlowIgnore - directives isn't optional in the type definition\n delete node.directives;\n }\n\n pushClassMethod(\n classBody: N.ClassBody,\n method: N.ClassMethod,\n isGenerator: boolean,\n isAsync: boolean,\n isConstructor: boolean,\n allowsDirectSuper: boolean,\n ): void {\n this.parseMethod(\n method,\n isGenerator,\n isAsync,\n isConstructor,\n allowsDirectSuper,\n \"ClassMethod\",\n true,\n );\n if (method.typeParameters) {\n // $FlowIgnore\n method.value.typeParameters = method.typeParameters;\n delete method.typeParameters;\n }\n classBody.body.push(method);\n }\n\n parsePrivateName(): any {\n const node = super.parsePrivateName();\n if (!process.env.BABEL_8_BREAKING) {\n if (!this.getPluginOption(\"estree\", \"classFeatures\")) {\n return node;\n }\n }\n return this.convertPrivateNameToPrivateIdentifier(node);\n }\n\n convertPrivateNameToPrivateIdentifier(\n node: N.PrivateName,\n ): N.EstreePrivateIdentifier {\n const name = super.getPrivateNameSV(node);\n node = (node: any);\n delete node.id;\n node.name = name;\n node.type = \"PrivateIdentifier\";\n return node;\n }\n\n isPrivateName(node: N.Node): boolean {\n if (!process.env.BABEL_8_BREAKING) {\n if (!this.getPluginOption(\"estree\", \"classFeatures\")) {\n return super.isPrivateName(node);\n }\n }\n return node.type === \"PrivateIdentifier\";\n }\n\n getPrivateNameSV(node: N.Node): string {\n if (!process.env.BABEL_8_BREAKING) {\n if (!this.getPluginOption(\"estree\", \"classFeatures\")) {\n return super.getPrivateNameSV(node);\n }\n }\n return node.name;\n }\n\n parseLiteral(value: any, type: $ElementType): T {\n const node = super.parseLiteral(value, type);\n node.raw = node.extra.raw;\n delete node.extra;\n\n return node;\n }\n\n parseFunctionBody(\n node: N.Function,\n allowExpression: ?boolean,\n isMethod?: boolean = false,\n ): void {\n super.parseFunctionBody(node, allowExpression, isMethod);\n node.expression = node.body.type !== \"BlockStatement\";\n }\n\n parseMethod(\n node: T,\n isGenerator: boolean,\n isAsync: boolean,\n isConstructor: boolean,\n allowDirectSuper: boolean,\n type: string,\n inClassScope: boolean = false,\n ): T {\n let funcNode = this.startNode();\n funcNode.kind = node.kind; // provide kind, so super method correctly sets state\n funcNode = super.parseMethod(\n funcNode,\n isGenerator,\n isAsync,\n isConstructor,\n allowDirectSuper,\n type,\n inClassScope,\n );\n funcNode.type = \"FunctionExpression\";\n delete funcNode.kind;\n // $FlowIgnore\n node.value = funcNode;\n if (type === \"ClassPrivateMethod\") {\n // $FlowIgnore\n node.computed = false;\n }\n type = \"MethodDefinition\";\n return this.finishNode(node, type);\n }\n\n parseClassProperty(...args: [N.ClassProperty]): any {\n const propertyNode = (super.parseClassProperty(...args): any);\n if (!process.env.BABEL_8_BREAKING) {\n if (!this.getPluginOption(\"estree\", \"classFeatures\")) {\n return (propertyNode: N.EstreePropertyDefinition);\n }\n }\n propertyNode.type = \"PropertyDefinition\";\n return (propertyNode: N.EstreePropertyDefinition);\n }\n\n parseClassPrivateProperty(...args: [N.ClassPrivateProperty]): any {\n const propertyNode = (super.parseClassPrivateProperty(...args): any);\n if (!process.env.BABEL_8_BREAKING) {\n if (!this.getPluginOption(\"estree\", \"classFeatures\")) {\n return (propertyNode: N.EstreePropertyDefinition);\n }\n }\n propertyNode.type = \"PropertyDefinition\";\n propertyNode.computed = false;\n return (propertyNode: N.EstreePropertyDefinition);\n }\n\n parseObjectMethod(\n prop: N.ObjectMethod,\n isGenerator: boolean,\n isAsync: boolean,\n isPattern: boolean,\n isAccessor: boolean,\n ): ?N.ObjectMethod {\n const node: N.EstreeProperty = (super.parseObjectMethod(\n prop,\n isGenerator,\n isAsync,\n isPattern,\n isAccessor,\n ): any);\n\n if (node) {\n node.type = \"Property\";\n if (((node: any): N.ClassMethod).kind === \"method\") node.kind = \"init\";\n node.shorthand = false;\n }\n\n return (node: any);\n }\n\n parseObjectProperty(\n prop: N.ObjectProperty,\n startPos: ?number,\n startLoc: ?Position,\n isPattern: boolean,\n refExpressionErrors: ?ExpressionErrors,\n ): ?N.ObjectProperty {\n const node: N.EstreeProperty = (super.parseObjectProperty(\n prop,\n startPos,\n startLoc,\n isPattern,\n refExpressionErrors,\n ): any);\n\n if (node) {\n node.kind = \"init\";\n node.type = \"Property\";\n }\n\n return (node: any);\n }\n\n isAssignable(node: N.Node, isBinding?: boolean): boolean {\n if (node != null && this.isObjectProperty(node)) {\n return this.isAssignable(node.value, isBinding);\n }\n return super.isAssignable(node, isBinding);\n }\n\n toAssignable(node: N.Node, isLHS: boolean = false): N.Node {\n if (node != null && this.isObjectProperty(node)) {\n this.toAssignable(node.value, isLHS);\n\n return node;\n }\n\n return super.toAssignable(node, isLHS);\n }\n\n toAssignableObjectExpressionProp(prop: N.Node, ...args) {\n if (prop.kind === \"get\" || prop.kind === \"set\") {\n this.raise(prop.key.start, Errors.PatternHasAccessor);\n } else if (prop.method) {\n this.raise(prop.key.start, Errors.PatternHasMethod);\n } else {\n super.toAssignableObjectExpressionProp(prop, ...args);\n }\n }\n\n finishCallExpression(\n node: T,\n optional: boolean,\n ): N.Expression {\n super.finishCallExpression(node, optional);\n\n if (node.callee.type === \"Import\") {\n ((node: N.Node): N.EstreeImportExpression).type = \"ImportExpression\";\n ((node: N.Node): N.EstreeImportExpression).source = node.arguments[0];\n if (this.hasPlugin(\"importAssertions\")) {\n ((node: N.Node): N.EstreeImportExpression).attributes =\n node.arguments[1] ?? null;\n }\n // $FlowIgnore - arguments isn't optional in the type definition\n delete node.arguments;\n // $FlowIgnore - callee isn't optional in the type definition\n delete node.callee;\n }\n\n return node;\n }\n\n toReferencedArguments(\n node:\n | N.CallExpression\n | N.OptionalCallExpression\n | N.EstreeImportExpression,\n /* isParenthesizedExpr?: boolean, */\n ) {\n // ImportExpressions do not have an arguments array.\n if (node.type === \"ImportExpression\") {\n return;\n }\n\n super.toReferencedArguments(node);\n }\n\n parseExport(node: N.Node) {\n super.parseExport(node);\n\n switch (node.type) {\n case \"ExportAllDeclaration\":\n node.exported = null;\n break;\n\n case \"ExportNamedDeclaration\":\n if (\n node.specifiers.length === 1 &&\n node.specifiers[0].type === \"ExportNamespaceSpecifier\"\n ) {\n node.type = \"ExportAllDeclaration\";\n node.exported = node.specifiers[0].exported;\n delete node.specifiers;\n }\n\n break;\n }\n\n return node;\n }\n\n parseSubscript(\n base: N.Expression,\n startPos: number,\n startLoc: Position,\n noCalls: ?boolean,\n state: N.ParseSubscriptState,\n ) {\n const node = super.parseSubscript(\n base,\n startPos,\n startLoc,\n noCalls,\n state,\n );\n\n if (state.optionalChainMember) {\n // https://github.com/estree/estree/blob/master/es2020.md#chainexpression\n if (\n node.type === \"OptionalMemberExpression\" ||\n node.type === \"OptionalCallExpression\"\n ) {\n node.type = node.type.substring(8); // strip Optional prefix\n }\n if (state.stop) {\n const chain = this.startNodeAtNode(node);\n chain.expression = node;\n return this.finishNode(chain, \"ChainExpression\");\n }\n } else if (\n node.type === \"MemberExpression\" ||\n node.type === \"CallExpression\"\n ) {\n node.optional = false;\n }\n\n return node;\n }\n\n hasPropertyAsPrivateName(node: N.Node): boolean {\n if (node.type === \"ChainExpression\") {\n node = node.expression;\n }\n return super.hasPropertyAsPrivateName(node);\n }\n\n isOptionalChain(node: N.Node): boolean {\n return node.type === \"ChainExpression\";\n }\n\n isObjectProperty(node: N.Node): boolean {\n return node.type === \"Property\" && node.kind === \"init\" && !node.method;\n }\n\n isObjectMethod(node: N.Node): boolean {\n return node.method || node.kind === \"get\" || node.kind === \"set\";\n }\n };\n","// @flow\n\n// The token context is used to track whether the apostrophe \"`\"\n// starts or ends a string template\n\nexport class TokContext {\n constructor(token: string, preserveSpace?: boolean) {\n this.token = token;\n this.preserveSpace = !!preserveSpace;\n }\n\n token: string;\n preserveSpace: boolean;\n}\n\nexport const types: {\n [key: string]: TokContext,\n} = {\n brace: new TokContext(\"{\"),\n template: new TokContext(\"`\", true),\n};\n","// @flow\nimport { types as tc, type TokContext } from \"./context\";\n// ## Token types\n\n// The assignment of fine-grained, information-carrying type objects\n// allows the tokenizer to store the information it has about a\n// token in a way that is very cheap for the parser to look up.\n\n// All token type variables start with an underscore, to make them\n// easy to recognize.\n\n// The `beforeExpr` property is used to disambiguate between 1) binary\n// expression (<) and JSX Tag start (); 2) object literal and JSX\n// texts. It is set on the `updateContext` function in the JSX plugin.\n\n// The `startsExpr` property is used to determine whether an expression\n// may be the “argument” subexpression of a `yield` expression or\n// `yield` statement. It is set on all token types that may be at the\n// start of a subexpression.\n\n// `isLoop` marks a keyword as starting a loop, which is important\n// to know when parsing a label, in order to allow or disallow\n// continue jumps to that label.\n\nconst beforeExpr = true;\nconst startsExpr = true;\nconst isLoop = true;\nconst isAssign = true;\nconst prefix = true;\nconst postfix = true;\n\ntype TokenOptions = {\n keyword?: string,\n beforeExpr?: boolean,\n startsExpr?: boolean,\n rightAssociative?: boolean,\n isLoop?: boolean,\n isAssign?: boolean,\n prefix?: boolean,\n postfix?: boolean,\n binop?: ?number,\n};\n\n// Internally the tokenizer stores token as a number\nexport opaque type TokenType = number;\n\n// The `ExportedTokenType` is exported via `tokTypes` and accessible\n// when `tokens: true` is enabled. Unlike internal token type, it provides\n// metadata of the tokens.\nexport class ExportedTokenType {\n label: string;\n keyword: ?string;\n beforeExpr: boolean;\n startsExpr: boolean;\n rightAssociative: boolean;\n isLoop: boolean;\n isAssign: boolean;\n prefix: boolean;\n postfix: boolean;\n binop: ?number;\n // todo(Babel 8): remove updateContext from exposed token layout\n declare updateContext: ?(context: Array) => void;\n\n constructor(label: string, conf: TokenOptions = {}) {\n this.label = label;\n this.keyword = conf.keyword;\n this.beforeExpr = !!conf.beforeExpr;\n this.startsExpr = !!conf.startsExpr;\n this.rightAssociative = !!conf.rightAssociative;\n this.isLoop = !!conf.isLoop;\n this.isAssign = !!conf.isAssign;\n this.prefix = !!conf.prefix;\n this.postfix = !!conf.postfix;\n this.binop = conf.binop != null ? conf.binop : null;\n if (!process.env.BABEL_8_BREAKING) {\n this.updateContext = null;\n }\n }\n}\n\n// A map from keyword/keyword-like string value to the token type\nexport const keywords = new Map();\n\nfunction createKeyword(name: string, options: TokenOptions = {}): TokenType {\n options.keyword = name;\n const token = createToken(name, options);\n keywords.set(name, token);\n return token;\n}\n\nfunction createBinop(name: string, binop: number) {\n return createToken(name, { beforeExpr, binop });\n}\n\nlet tokenTypeCounter = -1;\nexport const tokenTypes: ExportedTokenType[] = [];\nconst tokenLabels: string[] = [];\nconst tokenBinops: number[] = [];\nconst tokenBeforeExprs: boolean[] = [];\nconst tokenStartsExprs: boolean[] = [];\nconst tokenPrefixes: boolean[] = [];\n\nfunction createToken(name: string, options: TokenOptions = {}): TokenType {\n ++tokenTypeCounter;\n tokenLabels.push(name);\n tokenBinops.push(options.binop ?? -1);\n tokenBeforeExprs.push(options.beforeExpr ?? false);\n tokenStartsExprs.push(options.startsExpr ?? false);\n tokenPrefixes.push(options.prefix ?? false);\n tokenTypes.push(new ExportedTokenType(name, options));\n\n return tokenTypeCounter;\n}\n\nfunction createKeywordLike(\n name: string,\n options: TokenOptions = {},\n): TokenType {\n ++tokenTypeCounter;\n keywords.set(name, tokenTypeCounter);\n tokenLabels.push(name);\n tokenBinops.push(options.binop ?? -1);\n tokenBeforeExprs.push(options.beforeExpr ?? false);\n tokenStartsExprs.push(options.startsExpr ?? false);\n tokenPrefixes.push(options.prefix ?? false);\n // In the exported token type, we set the label as \"name\" for backward compatibility with Babel 7\n tokenTypes.push(new ExportedTokenType(\"name\", options));\n\n return tokenTypeCounter;\n}\n\n// For performance the token type helpers depend on the following declarations order.\n// When adding new token types, please also check if the token helpers need update.\n\nexport const tt: { [name: string]: TokenType } = {\n // Punctuation token types.\n bracketL: createToken(\"[\", { beforeExpr, startsExpr }),\n bracketHashL: createToken(\"#[\", { beforeExpr, startsExpr }),\n bracketBarL: createToken(\"[|\", { beforeExpr, startsExpr }),\n bracketR: createToken(\"]\"),\n bracketBarR: createToken(\"|]\"),\n braceL: createToken(\"{\", { beforeExpr, startsExpr }),\n braceBarL: createToken(\"{|\", { beforeExpr, startsExpr }),\n braceHashL: createToken(\"#{\", { beforeExpr, startsExpr }),\n braceR: createToken(\"}\", { beforeExpr }),\n braceBarR: createToken(\"|}\"),\n parenL: createToken(\"(\", { beforeExpr, startsExpr }),\n parenR: createToken(\")\"),\n comma: createToken(\",\", { beforeExpr }),\n semi: createToken(\";\", { beforeExpr }),\n colon: createToken(\":\", { beforeExpr }),\n doubleColon: createToken(\"::\", { beforeExpr }),\n dot: createToken(\".\"),\n question: createToken(\"?\", { beforeExpr }),\n questionDot: createToken(\"?.\"),\n arrow: createToken(\"=>\", { beforeExpr }),\n template: createToken(\"template\"),\n ellipsis: createToken(\"...\", { beforeExpr }),\n backQuote: createToken(\"`\", { startsExpr }),\n dollarBraceL: createToken(\"${\", { beforeExpr, startsExpr }),\n at: createToken(\"@\"),\n hash: createToken(\"#\", { startsExpr }),\n\n // Special hashbang token.\n interpreterDirective: createToken(\"#!...\"),\n\n // Operators. These carry several kinds of properties to help the\n // parser use them properly (the presence of these properties is\n // what categorizes them as operators).\n //\n // `binop`, when present, specifies that this operator is a binary\n // operator, and will refer to its precedence.\n //\n // `prefix` and `postfix` mark the operator as a prefix or postfix\n // unary operator.\n //\n // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as\n // binary operators with a very low precedence, that should result\n // in AssignmentExpression nodes.\n\n // start: isAssign\n eq: createToken(\"=\", { beforeExpr, isAssign }),\n assign: createToken(\"_=\", { beforeExpr, isAssign }),\n slashAssign: createToken(\"_=\", { beforeExpr, isAssign }),\n // These are only needed to support % and ^ as a Hack-pipe topic token. When the\n // proposal settles on a token, the others can be merged with tt.assign.\n xorAssign: createToken(\"_=\", { beforeExpr, isAssign }),\n moduloAssign: createToken(\"_=\", { beforeExpr, isAssign }),\n // end: isAssign\n\n incDec: createToken(\"++/--\", { prefix, postfix, startsExpr }),\n bang: createToken(\"!\", { beforeExpr, prefix, startsExpr }),\n tilde: createToken(\"~\", { beforeExpr, prefix, startsExpr }),\n // start: isBinop\n pipeline: createBinop(\"|>\", 0),\n nullishCoalescing: createBinop(\"??\", 1),\n logicalOR: createBinop(\"||\", 1),\n logicalAND: createBinop(\"&&\", 2),\n bitwiseOR: createBinop(\"|\", 3),\n bitwiseXOR: createBinop(\"^\", 4),\n bitwiseAND: createBinop(\"&\", 5),\n equality: createBinop(\"==/!=/===/!==\", 6),\n relational: createBinop(\"/<=/>=\", 7),\n bitShift: createBinop(\"<>/>>>\", 8),\n plusMin: createToken(\"+/-\", { beforeExpr, binop: 9, prefix, startsExpr }),\n // startsExpr: required by v8intrinsic plugin\n modulo: createToken(\"%\", { binop: 10, startsExpr }),\n // unset `beforeExpr` as it can be `function *`\n star: createToken(\"*\", { binop: 10 }),\n slash: createBinop(\"/\", 10),\n exponent: createToken(\"**\", {\n beforeExpr,\n binop: 11,\n rightAssociative: true,\n }),\n\n // Keywords\n // Don't forget to update packages/babel-helper-validator-identifier/src/keyword.js\n // when new keywords are added\n // start: isLiteralPropertyName\n // start: isKeyword\n _in: createKeyword(\"in\", { beforeExpr, binop: 7 }),\n _instanceof: createKeyword(\"instanceof\", { beforeExpr, binop: 7 }),\n // end: isBinop\n _break: createKeyword(\"break\"),\n _case: createKeyword(\"case\", { beforeExpr }),\n _catch: createKeyword(\"catch\"),\n _continue: createKeyword(\"continue\"),\n _debugger: createKeyword(\"debugger\"),\n _default: createKeyword(\"default\", { beforeExpr }),\n _else: createKeyword(\"else\", { beforeExpr }),\n _finally: createKeyword(\"finally\"),\n _function: createKeyword(\"function\", { startsExpr }),\n _if: createKeyword(\"if\"),\n _return: createKeyword(\"return\", { beforeExpr }),\n _switch: createKeyword(\"switch\"),\n _throw: createKeyword(\"throw\", { beforeExpr, prefix, startsExpr }),\n _try: createKeyword(\"try\"),\n _var: createKeyword(\"var\"),\n _const: createKeyword(\"const\"),\n _with: createKeyword(\"with\"),\n _new: createKeyword(\"new\", { beforeExpr, startsExpr }),\n _this: createKeyword(\"this\", { startsExpr }),\n _super: createKeyword(\"super\", { startsExpr }),\n _class: createKeyword(\"class\", { startsExpr }),\n _extends: createKeyword(\"extends\", { beforeExpr }),\n _export: createKeyword(\"export\"),\n _import: createKeyword(\"import\", { startsExpr }),\n _null: createKeyword(\"null\", { startsExpr }),\n _true: createKeyword(\"true\", { startsExpr }),\n _false: createKeyword(\"false\", { startsExpr }),\n _typeof: createKeyword(\"typeof\", { beforeExpr, prefix, startsExpr }),\n _void: createKeyword(\"void\", { beforeExpr, prefix, startsExpr }),\n _delete: createKeyword(\"delete\", { beforeExpr, prefix, startsExpr }),\n // start: isLoop\n _do: createKeyword(\"do\", { isLoop, beforeExpr }),\n _for: createKeyword(\"for\", { isLoop }),\n _while: createKeyword(\"while\", { isLoop }),\n // end: isLoop\n // end: isKeyword\n\n // Primary literals\n // start: isIdentifier\n _as: createKeywordLike(\"as\", { startsExpr }),\n _assert: createKeywordLike(\"assert\", { startsExpr }),\n _async: createKeywordLike(\"async\", { startsExpr }),\n _await: createKeywordLike(\"await\", { startsExpr }),\n _from: createKeywordLike(\"from\", { startsExpr }),\n _get: createKeywordLike(\"get\", { startsExpr }),\n _let: createKeywordLike(\"let\", { startsExpr }),\n _meta: createKeywordLike(\"meta\", { startsExpr }),\n _of: createKeywordLike(\"of\", { startsExpr }),\n _sent: createKeywordLike(\"sent\", { startsExpr }),\n _set: createKeywordLike(\"set\", { startsExpr }),\n _static: createKeywordLike(\"static\", { startsExpr }),\n _yield: createKeywordLike(\"yield\", { startsExpr }),\n\n // Flow and TypeScript Keywordlike\n _asserts: createKeywordLike(\"asserts\", { startsExpr }),\n _checks: createKeywordLike(\"checks\", { startsExpr }),\n _exports: createKeywordLike(\"exports\", { startsExpr }),\n _global: createKeywordLike(\"global\", { startsExpr }),\n _implements: createKeywordLike(\"implements\", { startsExpr }),\n _intrinsic: createKeywordLike(\"intrinsic\", { startsExpr }),\n _infer: createKeywordLike(\"infer\", { startsExpr }),\n _is: createKeywordLike(\"is\", { startsExpr }),\n _mixins: createKeywordLike(\"mixins\", { startsExpr }),\n _proto: createKeywordLike(\"proto\", { startsExpr }),\n _require: createKeywordLike(\"require\", { startsExpr }),\n // start: isTSTypeOperator\n _keyof: createKeywordLike(\"keyof\", { startsExpr }),\n _readonly: createKeywordLike(\"readonly\", { startsExpr }),\n _unique: createKeywordLike(\"unique\", { startsExpr }),\n // end: isTSTypeOperator\n // start: isTSDeclarationStart\n _abstract: createKeywordLike(\"abstract\", { startsExpr }),\n _declare: createKeywordLike(\"declare\", { startsExpr }),\n _enum: createKeywordLike(\"enum\", { startsExpr }),\n _module: createKeywordLike(\"module\", { startsExpr }),\n _namespace: createKeywordLike(\"namespace\", { startsExpr }),\n // start: isFlowInterfaceOrTypeOrOpaque\n _interface: createKeywordLike(\"interface\", { startsExpr }),\n _type: createKeywordLike(\"type\", { startsExpr }),\n // end: isTSDeclarationStart\n _opaque: createKeywordLike(\"opaque\", { startsExpr }),\n // end: isFlowInterfaceOrTypeOrOpaque\n name: createToken(\"name\", { startsExpr }),\n // end: isIdentifier\n\n string: createToken(\"string\", { startsExpr }),\n num: createToken(\"num\", { startsExpr }),\n bigint: createToken(\"bigint\", { startsExpr }),\n decimal: createToken(\"decimal\", { startsExpr }),\n // end: isLiteralPropertyName\n regexp: createToken(\"regexp\", { startsExpr }),\n privateName: createToken(\"#name\", { startsExpr }),\n eof: createToken(\"eof\"),\n\n // jsx plugin\n jsxName: createToken(\"jsxName\"),\n jsxText: createToken(\"jsxText\", { beforeExpr: true }),\n jsxTagStart: createToken(\"jsxTagStart\", { startsExpr: true }),\n jsxTagEnd: createToken(\"jsxTagEnd\"),\n\n // placeholder plugin\n placeholder: createToken(\"%%\", { startsExpr: true }),\n};\n\nexport function tokenIsIdentifier(token: TokenType): boolean {\n return token >= tt._as && token <= tt.name;\n}\n\nexport function tokenIsKeywordOrIdentifier(token: TokenType): boolean {\n return token >= tt._in && token <= tt.name;\n}\n\nexport function tokenIsLiteralPropertyName(token: TokenType): boolean {\n return token >= tt._in && token <= tt.decimal;\n}\n\nexport function tokenComesBeforeExpression(token: TokenType): boolean {\n return tokenBeforeExprs[token];\n}\n\nexport function tokenCanStartExpression(token: TokenType): boolean {\n return tokenStartsExprs[token];\n}\n\nexport function tokenIsAssignment(token: TokenType): boolean {\n return token >= tt.eq && token <= tt.moduloAssign;\n}\n\nexport function tokenIsFlowInterfaceOrTypeOrOpaque(token: TokenType): boolean {\n return token >= tt._interface && token <= tt._opaque;\n}\n\nexport function tokenIsLoop(token: TokenType): boolean {\n return token >= tt._do && token <= tt._while;\n}\n\nexport function tokenIsKeyword(token: TokenType): boolean {\n return token >= tt._in && token <= tt._while;\n}\n\nexport function tokenIsOperator(token: TokenType): boolean {\n return token >= tt.pipeline && token <= tt._instanceof;\n}\n\nexport function tokenIsPostfix(token: TokenType): boolean {\n return token === tt.incDec;\n}\n\nexport function tokenIsPrefix(token: TokenType): boolean {\n return tokenPrefixes[token];\n}\n\nexport function tokenIsTSTypeOperator(token: TokenType): boolean {\n return token >= tt._keyof && token <= tt._unique;\n}\n\nexport function tokenIsTSDeclarationStart(token: TokenType): boolean {\n return token >= tt._abstract && token <= tt._type;\n}\n\nexport function tokenLabelName(token: TokenType): string {\n return tokenLabels[token];\n}\n\nexport function tokenOperatorPrecedence(token: TokenType): number {\n return tokenBinops[token];\n}\n\nexport function tokenIsRightAssociative(token: TokenType): boolean {\n return token === tt.exponent;\n}\n\nexport function getExportedToken(token: TokenType): ExportedTokenType {\n return tokenTypes[token];\n}\n\nexport function isTokenType(obj: any): boolean {\n return typeof obj === \"number\";\n}\n\nif (!process.env.BABEL_8_BREAKING) {\n tokenTypes[tt.braceR].updateContext = context => {\n context.pop();\n };\n\n tokenTypes[tt.braceL].updateContext =\n tokenTypes[tt.braceHashL].updateContext =\n tokenTypes[tt.dollarBraceL].updateContext =\n context => {\n context.push(tc.brace);\n };\n\n tokenTypes[tt.backQuote].updateContext = context => {\n if (context[context.length - 1] === tc.template) {\n context.pop();\n } else {\n context.push(tc.template);\n }\n };\n\n tokenTypes[tt.jsxTagStart].updateContext = context => {\n context.push(tc.j_expr, tc.j_oTag);\n };\n}\n","import * as charCodes from \"charcodes\";\n\n// ## Character categories\n\n// Big ugly regular expressions that match characters in the\n// whitespace, identifier, and identifier-start categories. These\n// are only applied when a character is found to actually have a\n// code point between 0x80 and 0xffff.\n// Generated by `scripts/generate-identifier-regex.js`.\n\n/* prettier-ignore */\nlet nonASCIIidentifierStartChars = \"\\xaa\\xb5\\xba\\xc0-\\xd6\\xd8-\\xf6\\xf8-\\u02c1\\u02c6-\\u02d1\\u02e0-\\u02e4\\u02ec\\u02ee\\u0370-\\u0374\\u0376\\u0377\\u037a-\\u037d\\u037f\\u0386\\u0388-\\u038a\\u038c\\u038e-\\u03a1\\u03a3-\\u03f5\\u03f7-\\u0481\\u048a-\\u052f\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05d0-\\u05ea\\u05ef-\\u05f2\\u0620-\\u064a\\u066e\\u066f\\u0671-\\u06d3\\u06d5\\u06e5\\u06e6\\u06ee\\u06ef\\u06fa-\\u06fc\\u06ff\\u0710\\u0712-\\u072f\\u074d-\\u07a5\\u07b1\\u07ca-\\u07ea\\u07f4\\u07f5\\u07fa\\u0800-\\u0815\\u081a\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086a\\u0870-\\u0887\\u0889-\\u088e\\u08a0-\\u08c9\\u0904-\\u0939\\u093d\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098c\\u098f\\u0990\\u0993-\\u09a8\\u09aa-\\u09b0\\u09b2\\u09b6-\\u09b9\\u09bd\\u09ce\\u09dc\\u09dd\\u09df-\\u09e1\\u09f0\\u09f1\\u09fc\\u0a05-\\u0a0a\\u0a0f\\u0a10\\u0a13-\\u0a28\\u0a2a-\\u0a30\\u0a32\\u0a33\\u0a35\\u0a36\\u0a38\\u0a39\\u0a59-\\u0a5c\\u0a5e\\u0a72-\\u0a74\\u0a85-\\u0a8d\\u0a8f-\\u0a91\\u0a93-\\u0aa8\\u0aaa-\\u0ab0\\u0ab2\\u0ab3\\u0ab5-\\u0ab9\\u0abd\\u0ad0\\u0ae0\\u0ae1\\u0af9\\u0b05-\\u0b0c\\u0b0f\\u0b10\\u0b13-\\u0b28\\u0b2a-\\u0b30\\u0b32\\u0b33\\u0b35-\\u0b39\\u0b3d\\u0b5c\\u0b5d\\u0b5f-\\u0b61\\u0b71\\u0b83\\u0b85-\\u0b8a\\u0b8e-\\u0b90\\u0b92-\\u0b95\\u0b99\\u0b9a\\u0b9c\\u0b9e\\u0b9f\\u0ba3\\u0ba4\\u0ba8-\\u0baa\\u0bae-\\u0bb9\\u0bd0\\u0c05-\\u0c0c\\u0c0e-\\u0c10\\u0c12-\\u0c28\\u0c2a-\\u0c39\\u0c3d\\u0c58-\\u0c5a\\u0c5d\\u0c60\\u0c61\\u0c80\\u0c85-\\u0c8c\\u0c8e-\\u0c90\\u0c92-\\u0ca8\\u0caa-\\u0cb3\\u0cb5-\\u0cb9\\u0cbd\\u0cdd\\u0cde\\u0ce0\\u0ce1\\u0cf1\\u0cf2\\u0d04-\\u0d0c\\u0d0e-\\u0d10\\u0d12-\\u0d3a\\u0d3d\\u0d4e\\u0d54-\\u0d56\\u0d5f-\\u0d61\\u0d7a-\\u0d7f\\u0d85-\\u0d96\\u0d9a-\\u0db1\\u0db3-\\u0dbb\\u0dbd\\u0dc0-\\u0dc6\\u0e01-\\u0e30\\u0e32\\u0e33\\u0e40-\\u0e46\\u0e81\\u0e82\\u0e84\\u0e86-\\u0e8a\\u0e8c-\\u0ea3\\u0ea5\\u0ea7-\\u0eb0\\u0eb2\\u0eb3\\u0ebd\\u0ec0-\\u0ec4\\u0ec6\\u0edc-\\u0edf\\u0f00\\u0f40-\\u0f47\\u0f49-\\u0f6c\\u0f88-\\u0f8c\\u1000-\\u102a\\u103f\\u1050-\\u1055\\u105a-\\u105d\\u1061\\u1065\\u1066\\u106e-\\u1070\\u1075-\\u1081\\u108e\\u10a0-\\u10c5\\u10c7\\u10cd\\u10d0-\\u10fa\\u10fc-\\u1248\\u124a-\\u124d\\u1250-\\u1256\\u1258\\u125a-\\u125d\\u1260-\\u1288\\u128a-\\u128d\\u1290-\\u12b0\\u12b2-\\u12b5\\u12b8-\\u12be\\u12c0\\u12c2-\\u12c5\\u12c8-\\u12d6\\u12d8-\\u1310\\u1312-\\u1315\\u1318-\\u135a\\u1380-\\u138f\\u13a0-\\u13f5\\u13f8-\\u13fd\\u1401-\\u166c\\u166f-\\u167f\\u1681-\\u169a\\u16a0-\\u16ea\\u16ee-\\u16f8\\u1700-\\u1711\\u171f-\\u1731\\u1740-\\u1751\\u1760-\\u176c\\u176e-\\u1770\\u1780-\\u17b3\\u17d7\\u17dc\\u1820-\\u1878\\u1880-\\u18a8\\u18aa\\u18b0-\\u18f5\\u1900-\\u191e\\u1950-\\u196d\\u1970-\\u1974\\u1980-\\u19ab\\u19b0-\\u19c9\\u1a00-\\u1a16\\u1a20-\\u1a54\\u1aa7\\u1b05-\\u1b33\\u1b45-\\u1b4c\\u1b83-\\u1ba0\\u1bae\\u1baf\\u1bba-\\u1be5\\u1c00-\\u1c23\\u1c4d-\\u1c4f\\u1c5a-\\u1c7d\\u1c80-\\u1c88\\u1c90-\\u1cba\\u1cbd-\\u1cbf\\u1ce9-\\u1cec\\u1cee-\\u1cf3\\u1cf5\\u1cf6\\u1cfa\\u1d00-\\u1dbf\\u1e00-\\u1f15\\u1f18-\\u1f1d\\u1f20-\\u1f45\\u1f48-\\u1f4d\\u1f50-\\u1f57\\u1f59\\u1f5b\\u1f5d\\u1f5f-\\u1f7d\\u1f80-\\u1fb4\\u1fb6-\\u1fbc\\u1fbe\\u1fc2-\\u1fc4\\u1fc6-\\u1fcc\\u1fd0-\\u1fd3\\u1fd6-\\u1fdb\\u1fe0-\\u1fec\\u1ff2-\\u1ff4\\u1ff6-\\u1ffc\\u2071\\u207f\\u2090-\\u209c\\u2102\\u2107\\u210a-\\u2113\\u2115\\u2118-\\u211d\\u2124\\u2126\\u2128\\u212a-\\u2139\\u213c-\\u213f\\u2145-\\u2149\\u214e\\u2160-\\u2188\\u2c00-\\u2ce4\\u2ceb-\\u2cee\\u2cf2\\u2cf3\\u2d00-\\u2d25\\u2d27\\u2d2d\\u2d30-\\u2d67\\u2d6f\\u2d80-\\u2d96\\u2da0-\\u2da6\\u2da8-\\u2dae\\u2db0-\\u2db6\\u2db8-\\u2dbe\\u2dc0-\\u2dc6\\u2dc8-\\u2dce\\u2dd0-\\u2dd6\\u2dd8-\\u2dde\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303c\\u3041-\\u3096\\u309b-\\u309f\\u30a1-\\u30fa\\u30fc-\\u30ff\\u3105-\\u312f\\u3131-\\u318e\\u31a0-\\u31bf\\u31f0-\\u31ff\\u3400-\\u4dbf\\u4e00-\\ua48c\\ua4d0-\\ua4fd\\ua500-\\ua60c\\ua610-\\ua61f\\ua62a\\ua62b\\ua640-\\ua66e\\ua67f-\\ua69d\\ua6a0-\\ua6ef\\ua717-\\ua71f\\ua722-\\ua788\\ua78b-\\ua7ca\\ua7d0\\ua7d1\\ua7d3\\ua7d5-\\ua7d9\\ua7f2-\\ua801\\ua803-\\ua805\\ua807-\\ua80a\\ua80c-\\ua822\\ua840-\\ua873\\ua882-\\ua8b3\\ua8f2-\\ua8f7\\ua8fb\\ua8fd\\ua8fe\\ua90a-\\ua925\\ua930-\\ua946\\ua960-\\ua97c\\ua984-\\ua9b2\\ua9cf\\ua9e0-\\ua9e4\\ua9e6-\\ua9ef\\ua9fa-\\ua9fe\\uaa00-\\uaa28\\uaa40-\\uaa42\\uaa44-\\uaa4b\\uaa60-\\uaa76\\uaa7a\\uaa7e-\\uaaaf\\uaab1\\uaab5\\uaab6\\uaab9-\\uaabd\\uaac0\\uaac2\\uaadb-\\uaadd\\uaae0-\\uaaea\\uaaf2-\\uaaf4\\uab01-\\uab06\\uab09-\\uab0e\\uab11-\\uab16\\uab20-\\uab26\\uab28-\\uab2e\\uab30-\\uab5a\\uab5c-\\uab69\\uab70-\\uabe2\\uac00-\\ud7a3\\ud7b0-\\ud7c6\\ud7cb-\\ud7fb\\uf900-\\ufa6d\\ufa70-\\ufad9\\ufb00-\\ufb06\\ufb13-\\ufb17\\ufb1d\\ufb1f-\\ufb28\\ufb2a-\\ufb36\\ufb38-\\ufb3c\\ufb3e\\ufb40\\ufb41\\ufb43\\ufb44\\ufb46-\\ufbb1\\ufbd3-\\ufd3d\\ufd50-\\ufd8f\\ufd92-\\ufdc7\\ufdf0-\\ufdfb\\ufe70-\\ufe74\\ufe76-\\ufefc\\uff21-\\uff3a\\uff41-\\uff5a\\uff66-\\uffbe\\uffc2-\\uffc7\\uffca-\\uffcf\\uffd2-\\uffd7\\uffda-\\uffdc\";\n/* prettier-ignore */\nlet nonASCIIidentifierChars = \"\\u200c\\u200d\\xb7\\u0300-\\u036f\\u0387\\u0483-\\u0487\\u0591-\\u05bd\\u05bf\\u05c1\\u05c2\\u05c4\\u05c5\\u05c7\\u0610-\\u061a\\u064b-\\u0669\\u0670\\u06d6-\\u06dc\\u06df-\\u06e4\\u06e7\\u06e8\\u06ea-\\u06ed\\u06f0-\\u06f9\\u0711\\u0730-\\u074a\\u07a6-\\u07b0\\u07c0-\\u07c9\\u07eb-\\u07f3\\u07fd\\u0816-\\u0819\\u081b-\\u0823\\u0825-\\u0827\\u0829-\\u082d\\u0859-\\u085b\\u0898-\\u089f\\u08ca-\\u08e1\\u08e3-\\u0903\\u093a-\\u093c\\u093e-\\u094f\\u0951-\\u0957\\u0962\\u0963\\u0966-\\u096f\\u0981-\\u0983\\u09bc\\u09be-\\u09c4\\u09c7\\u09c8\\u09cb-\\u09cd\\u09d7\\u09e2\\u09e3\\u09e6-\\u09ef\\u09fe\\u0a01-\\u0a03\\u0a3c\\u0a3e-\\u0a42\\u0a47\\u0a48\\u0a4b-\\u0a4d\\u0a51\\u0a66-\\u0a71\\u0a75\\u0a81-\\u0a83\\u0abc\\u0abe-\\u0ac5\\u0ac7-\\u0ac9\\u0acb-\\u0acd\\u0ae2\\u0ae3\\u0ae6-\\u0aef\\u0afa-\\u0aff\\u0b01-\\u0b03\\u0b3c\\u0b3e-\\u0b44\\u0b47\\u0b48\\u0b4b-\\u0b4d\\u0b55-\\u0b57\\u0b62\\u0b63\\u0b66-\\u0b6f\\u0b82\\u0bbe-\\u0bc2\\u0bc6-\\u0bc8\\u0bca-\\u0bcd\\u0bd7\\u0be6-\\u0bef\\u0c00-\\u0c04\\u0c3c\\u0c3e-\\u0c44\\u0c46-\\u0c48\\u0c4a-\\u0c4d\\u0c55\\u0c56\\u0c62\\u0c63\\u0c66-\\u0c6f\\u0c81-\\u0c83\\u0cbc\\u0cbe-\\u0cc4\\u0cc6-\\u0cc8\\u0cca-\\u0ccd\\u0cd5\\u0cd6\\u0ce2\\u0ce3\\u0ce6-\\u0cef\\u0d00-\\u0d03\\u0d3b\\u0d3c\\u0d3e-\\u0d44\\u0d46-\\u0d48\\u0d4a-\\u0d4d\\u0d57\\u0d62\\u0d63\\u0d66-\\u0d6f\\u0d81-\\u0d83\\u0dca\\u0dcf-\\u0dd4\\u0dd6\\u0dd8-\\u0ddf\\u0de6-\\u0def\\u0df2\\u0df3\\u0e31\\u0e34-\\u0e3a\\u0e47-\\u0e4e\\u0e50-\\u0e59\\u0eb1\\u0eb4-\\u0ebc\\u0ec8-\\u0ecd\\u0ed0-\\u0ed9\\u0f18\\u0f19\\u0f20-\\u0f29\\u0f35\\u0f37\\u0f39\\u0f3e\\u0f3f\\u0f71-\\u0f84\\u0f86\\u0f87\\u0f8d-\\u0f97\\u0f99-\\u0fbc\\u0fc6\\u102b-\\u103e\\u1040-\\u1049\\u1056-\\u1059\\u105e-\\u1060\\u1062-\\u1064\\u1067-\\u106d\\u1071-\\u1074\\u1082-\\u108d\\u108f-\\u109d\\u135d-\\u135f\\u1369-\\u1371\\u1712-\\u1715\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17b4-\\u17d3\\u17dd\\u17e0-\\u17e9\\u180b-\\u180d\\u180f-\\u1819\\u18a9\\u1920-\\u192b\\u1930-\\u193b\\u1946-\\u194f\\u19d0-\\u19da\\u1a17-\\u1a1b\\u1a55-\\u1a5e\\u1a60-\\u1a7c\\u1a7f-\\u1a89\\u1a90-\\u1a99\\u1ab0-\\u1abd\\u1abf-\\u1ace\\u1b00-\\u1b04\\u1b34-\\u1b44\\u1b50-\\u1b59\\u1b6b-\\u1b73\\u1b80-\\u1b82\\u1ba1-\\u1bad\\u1bb0-\\u1bb9\\u1be6-\\u1bf3\\u1c24-\\u1c37\\u1c40-\\u1c49\\u1c50-\\u1c59\\u1cd0-\\u1cd2\\u1cd4-\\u1ce8\\u1ced\\u1cf4\\u1cf7-\\u1cf9\\u1dc0-\\u1dff\\u203f\\u2040\\u2054\\u20d0-\\u20dc\\u20e1\\u20e5-\\u20f0\\u2cef-\\u2cf1\\u2d7f\\u2de0-\\u2dff\\u302a-\\u302f\\u3099\\u309a\\ua620-\\ua629\\ua66f\\ua674-\\ua67d\\ua69e\\ua69f\\ua6f0\\ua6f1\\ua802\\ua806\\ua80b\\ua823-\\ua827\\ua82c\\ua880\\ua881\\ua8b4-\\ua8c5\\ua8d0-\\ua8d9\\ua8e0-\\ua8f1\\ua8ff-\\ua909\\ua926-\\ua92d\\ua947-\\ua953\\ua980-\\ua983\\ua9b3-\\ua9c0\\ua9d0-\\ua9d9\\ua9e5\\ua9f0-\\ua9f9\\uaa29-\\uaa36\\uaa43\\uaa4c\\uaa4d\\uaa50-\\uaa59\\uaa7b-\\uaa7d\\uaab0\\uaab2-\\uaab4\\uaab7\\uaab8\\uaabe\\uaabf\\uaac1\\uaaeb-\\uaaef\\uaaf5\\uaaf6\\uabe3-\\uabea\\uabec\\uabed\\uabf0-\\uabf9\\ufb1e\\ufe00-\\ufe0f\\ufe20-\\ufe2f\\ufe33\\ufe34\\ufe4d-\\ufe4f\\uff10-\\uff19\\uff3f\";\n\nconst nonASCIIidentifierStart = new RegExp(\n \"[\" + nonASCIIidentifierStartChars + \"]\",\n);\nconst nonASCIIidentifier = new RegExp(\n \"[\" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + \"]\",\n);\n\nnonASCIIidentifierStartChars = nonASCIIidentifierChars = null;\n\n// These are a run-length and offset-encoded representation of the\n// >0xffff code points that are a valid part of identifiers. The\n// offset starts at 0x10000, and each pair of numbers represents an\n// offset to the next range, and then a size of the range. They were\n// generated by `scripts/generate-identifier-regex.js`.\n/* prettier-ignore */\nconst astralIdentifierStartCodes = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,13,10,2,14,2,6,2,1,2,10,2,14,2,6,2,1,68,310,10,21,11,7,25,5,2,41,2,8,70,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,349,41,7,1,79,28,11,0,9,21,43,17,47,20,28,22,13,52,58,1,3,0,14,44,33,24,27,35,30,0,3,0,9,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,21,2,31,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,14,0,72,26,38,6,186,43,117,63,32,7,3,0,3,7,2,1,2,23,16,0,2,0,95,7,3,38,17,0,2,0,29,0,11,39,8,0,22,0,12,45,20,0,19,72,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,190,0,80,921,103,110,18,195,2637,96,16,1070,4050,582,8634,568,8,30,18,78,18,29,19,47,17,3,32,20,6,18,689,63,129,74,6,0,67,12,65,1,2,0,29,6135,9,1237,43,8,8936,3,2,6,2,1,2,290,46,2,18,3,9,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,1845,30,482,44,11,6,17,0,322,29,19,43,1269,6,2,3,2,1,2,14,2,196,60,67,8,0,1205,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42719,33,4152,8,221,3,5761,15,7472,3104,541,1507,4938];\n/* prettier-ignore */\nconst astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,370,1,154,10,50,3,123,2,54,14,32,10,3,1,11,3,46,10,8,0,46,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,2,11,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,71,5,2,1,3,3,2,0,2,1,13,9,120,6,3,6,4,0,29,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,87,9,39,4,60,6,26,9,1014,0,2,54,8,3,82,0,12,1,19628,1,4706,45,3,22,543,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,262,6,10,9,357,0,62,13,1495,6,110,6,6,9,4759,9,787719,239];\n\n// This has a complexity linear to the value of the code. The\n// assumption is that looking up astral identifier characters is\n// rare.\nfunction isInAstralSet(code: number, set: readonly number[]): boolean {\n let pos = 0x10000;\n for (let i = 0, length = set.length; i < length; i += 2) {\n pos += set[i];\n if (pos > code) return false;\n\n pos += set[i + 1];\n if (pos >= code) return true;\n }\n return false;\n}\n\n// Test whether a given character code starts an identifier.\n\nexport function isIdentifierStart(code: number): boolean {\n if (code < charCodes.uppercaseA) return code === charCodes.dollarSign;\n if (code <= charCodes.uppercaseZ) return true;\n if (code < charCodes.lowercaseA) return code === charCodes.underscore;\n if (code <= charCodes.lowercaseZ) return true;\n if (code <= 0xffff) {\n return (\n code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code))\n );\n }\n return isInAstralSet(code, astralIdentifierStartCodes);\n}\n\n// Test whether a given character is part of an identifier.\n\nexport function isIdentifierChar(code: number): boolean {\n if (code < charCodes.digit0) return code === charCodes.dollarSign;\n if (code < charCodes.colon) return true;\n if (code < charCodes.uppercaseA) return false;\n if (code <= charCodes.uppercaseZ) return true;\n if (code < charCodes.lowercaseA) return code === charCodes.underscore;\n if (code <= charCodes.lowercaseZ) return true;\n if (code <= 0xffff) {\n return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));\n }\n return (\n isInAstralSet(code, astralIdentifierStartCodes) ||\n isInAstralSet(code, astralIdentifierCodes)\n );\n}\n\n// Test whether a given string is a valid identifier name\n\nexport function isIdentifierName(name: string): boolean {\n let isFirst = true;\n for (let i = 0; i < name.length; i++) {\n // The implementation is based on\n // https://source.chromium.org/chromium/chromium/src/+/master:v8/src/builtins/builtins-string-gen.cc;l=1455;drc=221e331b49dfefadbc6fa40b0c68e6f97606d0b3;bpv=0;bpt=1\n // We reimplement `codePointAt` because `codePointAt` is a V8 builtin which is not inlined by TurboFan (as of M91)\n // since `name` is mostly ASCII, an inlined `charCodeAt` wins here\n let cp = name.charCodeAt(i);\n if ((cp & 0xfc00) === 0xd800 && i + 1 < name.length) {\n const trail = name.charCodeAt(++i);\n if ((trail & 0xfc00) === 0xdc00) {\n cp = 0x10000 + ((cp & 0x3ff) << 10) + (trail & 0x3ff);\n }\n }\n if (isFirst) {\n isFirst = false;\n if (!isIdentifierStart(cp)) {\n return false;\n }\n } else if (!isIdentifierChar(cp)) {\n return false;\n }\n }\n return !isFirst;\n}\n","const reservedWords = {\n keyword: [\n \"break\",\n \"case\",\n \"catch\",\n \"continue\",\n \"debugger\",\n \"default\",\n \"do\",\n \"else\",\n \"finally\",\n \"for\",\n \"function\",\n \"if\",\n \"return\",\n \"switch\",\n \"throw\",\n \"try\",\n \"var\",\n \"const\",\n \"while\",\n \"with\",\n \"new\",\n \"this\",\n \"super\",\n \"class\",\n \"extends\",\n \"export\",\n \"import\",\n \"null\",\n \"true\",\n \"false\",\n \"in\",\n \"instanceof\",\n \"typeof\",\n \"void\",\n \"delete\",\n ],\n strict: [\n \"implements\",\n \"interface\",\n \"let\",\n \"package\",\n \"private\",\n \"protected\",\n \"public\",\n \"static\",\n \"yield\",\n ],\n strictBind: [\"eval\", \"arguments\"],\n};\nconst keywords = new Set(reservedWords.keyword);\nconst reservedWordsStrictSet = new Set(reservedWords.strict);\nconst reservedWordsStrictBindSet = new Set(reservedWords.strictBind);\n\n/**\n * Checks if word is a reserved word in non-strict mode\n */\nexport function isReservedWord(word: string, inModule: boolean): boolean {\n return (inModule && word === \"await\") || word === \"enum\";\n}\n\n/**\n * Checks if word is a reserved word in non-binding strict mode\n *\n * Includes non-strict reserved words\n */\nexport function isStrictReservedWord(word: string, inModule: boolean): boolean {\n return isReservedWord(word, inModule) || reservedWordsStrictSet.has(word);\n}\n\n/**\n * Checks if word is a reserved word in binding strict mode, but it is allowed as\n * a normal identifier.\n */\nexport function isStrictBindOnlyReservedWord(word: string): boolean {\n return reservedWordsStrictBindSet.has(word);\n}\n\n/**\n * Checks if word is a reserved word in binding strict mode\n *\n * Includes non-strict reserved words and non-binding strict reserved words\n */\nexport function isStrictBindReservedWord(\n word: string,\n inModule: boolean,\n): boolean {\n return (\n isStrictReservedWord(word, inModule) || isStrictBindOnlyReservedWord(word)\n );\n}\n\nexport function isKeyword(word: string): boolean {\n return keywords.has(word);\n}\n","/* eslint max-len: 0 */\n\n// @flow\n\nimport * as charCodes from \"charcodes\";\n\nexport {\n isIdentifierStart,\n isIdentifierChar,\n isReservedWord,\n isStrictBindOnlyReservedWord,\n isStrictBindReservedWord,\n isStrictReservedWord,\n isKeyword,\n} from \"@babel/helper-validator-identifier\";\n\nexport const keywordRelationalOperator = /^in(stanceof)?$/;\n\n// Test whether a current state character code and next character code is @\n\nexport function isIteratorStart(current: number, next: number): boolean {\n return current === charCodes.atSign && next === charCodes.atSign;\n}\n\n// This is the comprehensive set of JavaScript reserved words\n// If a word is in this set, it could be a reserved word,\n// depending on sourceType/strictMode/binding info. In other words\n// if a word is not in this set, it is not a reserved word under\n// any circumstance.\nconst reservedWordLikeSet = new Set([\n \"break\",\n \"case\",\n \"catch\",\n \"continue\",\n \"debugger\",\n \"default\",\n \"do\",\n \"else\",\n \"finally\",\n \"for\",\n \"function\",\n \"if\",\n \"return\",\n \"switch\",\n \"throw\",\n \"try\",\n \"var\",\n \"const\",\n \"while\",\n \"with\",\n \"new\",\n \"this\",\n \"super\",\n \"class\",\n \"extends\",\n \"export\",\n \"import\",\n \"null\",\n \"true\",\n \"false\",\n \"in\",\n \"instanceof\",\n \"typeof\",\n \"void\",\n \"delete\",\n // strict\n \"implements\",\n \"interface\",\n \"let\",\n \"package\",\n \"private\",\n \"protected\",\n \"public\",\n \"static\",\n \"yield\",\n // strictBind\n \"eval\",\n \"arguments\",\n // reservedWorkLike\n \"enum\",\n \"await\",\n]);\n\nexport function canBeReservedWord(word: string): boolean {\n return reservedWordLikeSet.has(word);\n}\n","// @flow\n\n// Each scope gets a bitset that may contain these flags\n// prettier-ignore\nexport const SCOPE_OTHER = 0b000000000,\n SCOPE_PROGRAM = 0b000000001,\n SCOPE_FUNCTION = 0b000000010,\n SCOPE_ARROW = 0b000000100,\n SCOPE_SIMPLE_CATCH = 0b000001000,\n SCOPE_SUPER = 0b000010000,\n SCOPE_DIRECT_SUPER = 0b000100000,\n SCOPE_CLASS = 0b001000000,\n SCOPE_STATIC_BLOCK = 0b010000000,\n SCOPE_TS_MODULE = 0b100000000,\n SCOPE_VAR = SCOPE_PROGRAM | SCOPE_FUNCTION | SCOPE_TS_MODULE;\n\nexport type ScopeFlags =\n | typeof SCOPE_OTHER\n | typeof SCOPE_PROGRAM\n | typeof SCOPE_FUNCTION\n | typeof SCOPE_VAR\n | typeof SCOPE_ARROW\n | typeof SCOPE_SIMPLE_CATCH\n | typeof SCOPE_SUPER\n | typeof SCOPE_DIRECT_SUPER\n | typeof SCOPE_CLASS\n | typeof SCOPE_STATIC_BLOCK;\n\n// These flags are meant to be _only_ used inside the Scope class (or subclasses).\n// prettier-ignore\nexport const BIND_KIND_VALUE = 0b000000_0000_01,\n BIND_KIND_TYPE = 0b000000_0000_10,\n // Used in checkLVal and declareName to determine the type of a binding\n BIND_SCOPE_VAR = 0b000000_0001_00, // Var-style binding\n BIND_SCOPE_LEXICAL = 0b000000_0010_00, // Let- or const-style binding\n BIND_SCOPE_FUNCTION = 0b000000_0100_00, // Function declaration\n BIND_SCOPE_OUTSIDE = 0b000000_1000_00, // Special case for function names as\n // bound inside the function\n // Misc flags\n BIND_FLAGS_NONE = 0b000001_0000_00,\n BIND_FLAGS_CLASS = 0b000010_0000_00,\n BIND_FLAGS_TS_ENUM = 0b000100_0000_00,\n BIND_FLAGS_TS_CONST_ENUM = 0b001000_0000_00,\n BIND_FLAGS_TS_EXPORT_ONLY = 0b010000_0000_00,\n BIND_FLAGS_FLOW_DECLARE_FN = 0b100000_0000_00;\n\n// These flags are meant to be _only_ used by Scope consumers\n// prettier-ignore\n/* = is value? | is type? | scope | misc flags */\nexport const BIND_CLASS = BIND_KIND_VALUE | BIND_KIND_TYPE | BIND_SCOPE_LEXICAL | BIND_FLAGS_CLASS ,\n BIND_LEXICAL = BIND_KIND_VALUE | 0 | BIND_SCOPE_LEXICAL | 0 ,\n BIND_VAR = BIND_KIND_VALUE | 0 | BIND_SCOPE_VAR | 0 ,\n BIND_FUNCTION = BIND_KIND_VALUE | 0 | BIND_SCOPE_FUNCTION | 0 ,\n BIND_TS_INTERFACE = 0 | BIND_KIND_TYPE | 0 | BIND_FLAGS_CLASS ,\n BIND_TS_TYPE = 0 | BIND_KIND_TYPE | 0 | 0 ,\n BIND_TS_ENUM = BIND_KIND_VALUE | BIND_KIND_TYPE | BIND_SCOPE_LEXICAL | BIND_FLAGS_TS_ENUM,\n BIND_TS_AMBIENT = 0 | 0 | 0 | BIND_FLAGS_TS_EXPORT_ONLY,\n // These bindings don't introduce anything in the scope. They are used for assignments and\n // function expressions IDs.\n BIND_NONE = 0 | 0 | 0 | BIND_FLAGS_NONE ,\n BIND_OUTSIDE = BIND_KIND_VALUE | 0 | 0 | BIND_FLAGS_NONE ,\n\n BIND_TS_CONST_ENUM = BIND_TS_ENUM | BIND_FLAGS_TS_CONST_ENUM,\n BIND_TS_NAMESPACE = 0 | 0 | 0 | BIND_FLAGS_TS_EXPORT_ONLY,\n\n BIND_FLOW_DECLARE_FN = BIND_FLAGS_FLOW_DECLARE_FN;\n\nexport type BindingTypes =\n | typeof BIND_NONE\n | typeof BIND_OUTSIDE\n | typeof BIND_VAR\n | typeof BIND_LEXICAL\n | typeof BIND_CLASS\n | typeof BIND_FUNCTION\n | typeof BIND_TS_INTERFACE\n | typeof BIND_TS_TYPE\n | typeof BIND_TS_ENUM\n | typeof BIND_TS_AMBIENT\n | typeof BIND_TS_NAMESPACE;\n\n// prettier-ignore\nexport const CLASS_ELEMENT_FLAG_STATIC = 0b1_00,\n CLASS_ELEMENT_KIND_GETTER = 0b0_10,\n CLASS_ELEMENT_KIND_SETTER = 0b0_01,\n CLASS_ELEMENT_KIND_ACCESSOR = CLASS_ELEMENT_KIND_GETTER | CLASS_ELEMENT_KIND_SETTER;\n\n// prettier-ignore\nexport const CLASS_ELEMENT_STATIC_GETTER = CLASS_ELEMENT_KIND_GETTER | CLASS_ELEMENT_FLAG_STATIC,\n CLASS_ELEMENT_STATIC_SETTER = CLASS_ELEMENT_KIND_SETTER | CLASS_ELEMENT_FLAG_STATIC,\n CLASS_ELEMENT_INSTANCE_GETTER = CLASS_ELEMENT_KIND_GETTER,\n CLASS_ELEMENT_INSTANCE_SETTER = CLASS_ELEMENT_KIND_SETTER,\n CLASS_ELEMENT_OTHER = 0;\n\nexport type ClassElementTypes =\n | typeof CLASS_ELEMENT_STATIC_GETTER\n | typeof CLASS_ELEMENT_STATIC_SETTER\n | typeof CLASS_ELEMENT_INSTANCE_GETTER\n | typeof CLASS_ELEMENT_INSTANCE_SETTER\n | typeof CLASS_ELEMENT_OTHER;\n","// @flow\nimport {\n SCOPE_ARROW,\n SCOPE_DIRECT_SUPER,\n SCOPE_FUNCTION,\n SCOPE_SIMPLE_CATCH,\n SCOPE_SUPER,\n SCOPE_PROGRAM,\n SCOPE_VAR,\n SCOPE_CLASS,\n SCOPE_STATIC_BLOCK,\n BIND_SCOPE_FUNCTION,\n BIND_SCOPE_VAR,\n BIND_SCOPE_LEXICAL,\n BIND_KIND_VALUE,\n type ScopeFlags,\n type BindingTypes,\n} from \"./scopeflags\";\nimport * as N from \"../types\";\nimport { Errors, type raiseFunction } from \"../parser/error\";\n\n// Start an AST node, attaching a start offset.\nexport class Scope {\n declare flags: ScopeFlags;\n // A set of var-declared names in the current lexical scope\n var: Set = new Set();\n // A set of lexically-declared names in the current lexical scope\n lexical: Set = new Set();\n // A set of lexically-declared FunctionDeclaration names in the current lexical scope\n functions: Set = new Set();\n\n constructor(flags: ScopeFlags) {\n this.flags = flags;\n }\n}\n\n// The functions in this module keep track of declared variables in the\n// current scope in order to detect duplicate variable names.\nexport default class ScopeHandler {\n scopeStack: Array = [];\n declare raise: raiseFunction;\n declare inModule: boolean;\n undefinedExports: Map = new Map();\n undefinedPrivateNames: Map = new Map();\n\n constructor(raise: raiseFunction, inModule: boolean) {\n this.raise = raise;\n this.inModule = inModule;\n }\n\n get inFunction() {\n return (this.currentVarScopeFlags() & SCOPE_FUNCTION) > 0;\n }\n get allowSuper() {\n return (this.currentThisScopeFlags() & SCOPE_SUPER) > 0;\n }\n get allowDirectSuper() {\n return (this.currentThisScopeFlags() & SCOPE_DIRECT_SUPER) > 0;\n }\n get inClass() {\n return (this.currentThisScopeFlags() & SCOPE_CLASS) > 0;\n }\n get inClassAndNotInNonArrowFunction() {\n const flags = this.currentThisScopeFlags();\n return (flags & SCOPE_CLASS) > 0 && (flags & SCOPE_FUNCTION) === 0;\n }\n get inStaticBlock() {\n for (let i = this.scopeStack.length - 1; ; i--) {\n const { flags } = this.scopeStack[i];\n if (flags & SCOPE_STATIC_BLOCK) {\n return true;\n }\n if (flags & (SCOPE_VAR | SCOPE_CLASS)) {\n // function body, module body, class property initializers\n return false;\n }\n }\n }\n get inNonArrowFunction() {\n return (this.currentThisScopeFlags() & SCOPE_FUNCTION) > 0;\n }\n get treatFunctionsAsVar() {\n return this.treatFunctionsAsVarInScope(this.currentScope());\n }\n\n createScope(flags: ScopeFlags): Scope {\n return new Scope(flags);\n }\n // This method will be overwritten by subclasses\n /*:: +createScope: (flags: ScopeFlags) => IScope; */\n\n enter(flags: ScopeFlags) {\n this.scopeStack.push(this.createScope(flags));\n }\n\n exit() {\n this.scopeStack.pop();\n }\n\n // The spec says:\n // > At the top level of a function, or script, function declarations are\n // > treated like var declarations rather than like lexical declarations.\n treatFunctionsAsVarInScope(scope: IScope): boolean {\n return !!(\n scope.flags & SCOPE_FUNCTION ||\n (!this.inModule && scope.flags & SCOPE_PROGRAM)\n );\n }\n\n declareName(name: string, bindingType: BindingTypes, pos: number) {\n let scope = this.currentScope();\n if (bindingType & BIND_SCOPE_LEXICAL || bindingType & BIND_SCOPE_FUNCTION) {\n this.checkRedeclarationInScope(scope, name, bindingType, pos);\n\n if (bindingType & BIND_SCOPE_FUNCTION) {\n scope.functions.add(name);\n } else {\n scope.lexical.add(name);\n }\n\n if (bindingType & BIND_SCOPE_LEXICAL) {\n this.maybeExportDefined(scope, name);\n }\n } else if (bindingType & BIND_SCOPE_VAR) {\n for (let i = this.scopeStack.length - 1; i >= 0; --i) {\n scope = this.scopeStack[i];\n this.checkRedeclarationInScope(scope, name, bindingType, pos);\n scope.var.add(name);\n this.maybeExportDefined(scope, name);\n\n if (scope.flags & SCOPE_VAR) break;\n }\n }\n if (this.inModule && scope.flags & SCOPE_PROGRAM) {\n this.undefinedExports.delete(name);\n }\n }\n\n maybeExportDefined(scope: IScope, name: string) {\n if (this.inModule && scope.flags & SCOPE_PROGRAM) {\n this.undefinedExports.delete(name);\n }\n }\n\n checkRedeclarationInScope(\n scope: IScope,\n name: string,\n bindingType: BindingTypes,\n pos: number,\n ) {\n if (this.isRedeclaredInScope(scope, name, bindingType)) {\n this.raise(pos, Errors.VarRedeclaration, name);\n }\n }\n\n isRedeclaredInScope(\n scope: IScope,\n name: string,\n bindingType: BindingTypes,\n ): boolean {\n if (!(bindingType & BIND_KIND_VALUE)) return false;\n\n if (bindingType & BIND_SCOPE_LEXICAL) {\n return (\n scope.lexical.has(name) ||\n scope.functions.has(name) ||\n scope.var.has(name)\n );\n }\n\n if (bindingType & BIND_SCOPE_FUNCTION) {\n return (\n scope.lexical.has(name) ||\n (!this.treatFunctionsAsVarInScope(scope) && scope.var.has(name))\n );\n }\n\n return (\n (scope.lexical.has(name) &&\n !(\n scope.flags & SCOPE_SIMPLE_CATCH &&\n scope.lexical.values().next().value === name\n )) ||\n (!this.treatFunctionsAsVarInScope(scope) && scope.functions.has(name))\n );\n }\n\n checkLocalExport(id: N.Identifier) {\n const { name } = id;\n const topLevelScope = this.scopeStack[0];\n if (\n !topLevelScope.lexical.has(name) &&\n !topLevelScope.var.has(name) &&\n // In strict mode, scope.functions will always be empty.\n // Modules are strict by default, but the `scriptMode` option\n // can overwrite this behavior.\n !topLevelScope.functions.has(name)\n ) {\n this.undefinedExports.set(name, id.start);\n }\n }\n\n currentScope(): IScope {\n return this.scopeStack[this.scopeStack.length - 1];\n }\n\n // $FlowIgnore\n currentVarScopeFlags(): ScopeFlags {\n for (let i = this.scopeStack.length - 1; ; i--) {\n const { flags } = this.scopeStack[i];\n if (flags & SCOPE_VAR) {\n return flags;\n }\n }\n }\n\n // Could be useful for `arguments`, `this`, `new.target`, `super()`, `super.property`, and `super[property]`.\n // $FlowIgnore\n currentThisScopeFlags(): ScopeFlags {\n for (let i = this.scopeStack.length - 1; ; i--) {\n const { flags } = this.scopeStack[i];\n if (flags & (SCOPE_VAR | SCOPE_CLASS) && !(flags & SCOPE_ARROW)) {\n return flags;\n }\n }\n }\n}\n","// @flow\n\nimport ScopeHandler, { Scope } from \"../../util/scope\";\nimport {\n BIND_FLAGS_FLOW_DECLARE_FN,\n type ScopeFlags,\n type BindingTypes,\n} from \"../../util/scopeflags\";\nimport * as N from \"../../types\";\n\n// Reference implementation: https://github.com/facebook/flow/blob/23aeb2a2ef6eb4241ce178fde5d8f17c5f747fb5/src/typing/env.ml#L536-L584\nclass FlowScope extends Scope {\n // declare function foo(): type;\n declareFunctions: Set = new Set();\n}\n\nexport default class FlowScopeHandler extends ScopeHandler {\n createScope(flags: ScopeFlags): FlowScope {\n return new FlowScope(flags);\n }\n\n declareName(name: string, bindingType: BindingTypes, pos: number) {\n const scope = this.currentScope();\n if (bindingType & BIND_FLAGS_FLOW_DECLARE_FN) {\n this.checkRedeclarationInScope(scope, name, bindingType, pos);\n this.maybeExportDefined(scope, name);\n scope.declareFunctions.add(name);\n return;\n }\n\n super.declareName(...arguments);\n }\n\n isRedeclaredInScope(\n scope: FlowScope,\n name: string,\n bindingType: BindingTypes,\n ): boolean {\n if (super.isRedeclaredInScope(...arguments)) return true;\n\n if (bindingType & BIND_FLAGS_FLOW_DECLARE_FN) {\n return (\n !scope.declareFunctions.has(name) &&\n (scope.lexical.has(name) || scope.functions.has(name))\n );\n }\n\n return false;\n }\n\n checkLocalExport(id: N.Identifier) {\n if (!this.scopeStack[0].declareFunctions.has(id.name)) {\n super.checkLocalExport(id);\n }\n }\n}\n","// @flow\n\nimport type { Options } from \"../options\";\nimport * as N from \"../types\";\nimport type { CommentWhitespace } from \"../parser/comments\";\nimport { Position } from \"../util/location\";\n\nimport { types as ct, type TokContext } from \"./context\";\nimport { tt, type TokenType } from \"./types\";\nimport type { ParsingError, ErrorTemplate } from \"../parser/error\";\n\ntype TopicContextState = {\n // When a topic binding has been currently established,\n // then this is 1. Otherwise, it is 0. This is forwards compatible\n // with a future plugin for multiple lexical topics.\n maxNumOfResolvableTopics: number,\n\n // When a topic binding has been currently established, and if that binding\n // has been used as a topic reference `#`, then this is 0. Otherwise, it is\n // `null`. This is forwards compatible with a future plugin for multiple\n // lexical topics.\n maxTopicIndex: null | 0,\n};\n\nexport default class State {\n strict: boolean;\n curLine: number;\n lineStart: number;\n\n // And, if locations are used, the {line, column} object\n // corresponding to those offsets\n startLoc: Position;\n endLoc: Position;\n\n init({ strictMode, sourceType, startLine, startColumn }: Options): void {\n this.strict =\n strictMode === false\n ? false\n : strictMode === true\n ? true\n : sourceType === \"module\";\n\n this.curLine = startLine;\n this.lineStart = -startColumn;\n this.startLoc = this.endLoc = new Position(startLine, startColumn);\n }\n\n errors: ParsingError[] = [];\n\n // Used to signify the start of a potential arrow function\n potentialArrowAt: number = -1;\n\n // Used to signify the start of an expression which looks like a\n // typed arrow function, but it isn't\n // e.g. a ? (b) : c => d\n // ^\n noArrowAt: number[] = [];\n\n // Used to signify the start of an expression whose params, if it looks like\n // an arrow function, shouldn't be converted to assignable nodes.\n // This is used to defer the validation of typed arrow functions inside\n // conditional expressions.\n // e.g. a ? (b) : c => d\n // ^\n noArrowParamsConversionAt: number[] = [];\n\n // Flags to track\n maybeInArrowParameters: boolean = false;\n inType: boolean = false;\n noAnonFunctionType: boolean = false;\n inPropertyName: boolean = false;\n hasFlowComment: boolean = false;\n isAmbientContext: boolean = false;\n inAbstractClass: boolean = false;\n\n // For the Hack-style pipelines plugin\n topicContext: TopicContextState = {\n maxNumOfResolvableTopics: 0,\n maxTopicIndex: null,\n };\n\n // For the F#-style pipelines plugin\n soloAwait: boolean = false;\n inFSharpPipelineDirectBody: boolean = false;\n\n // Labels in scope.\n labels: Array<{\n kind: ?(\"loop\" | \"switch\"),\n name?: ?string,\n statementStart?: number,\n }> = [];\n\n // Leading decorators. Last element of the stack represents the decorators in current context.\n // Supports nesting of decorators, e.g. @foo(@bar class inner {}) class outer {}\n // where @foo belongs to the outer class and @bar to the inner\n decoratorStack: Array> = [[]];\n\n // Comment store for Program.comments\n comments: Array = [];\n\n // Comment attachment store\n commentStack: Array = [];\n\n // The current position of the tokenizer in the input.\n pos: number = 0;\n\n // Properties of the current token:\n // Its type\n type: TokenType = tt.eof;\n\n // For tokens that include more information than their type, the value\n value: any = null;\n\n // Its start and end offset\n start: number = 0;\n end: number = 0;\n\n // Position information for the previous token\n // $FlowIgnore this is initialized when generating the second token.\n lastTokEndLoc: Position = null;\n // $FlowIgnore this is initialized when generating the second token.\n lastTokStartLoc: Position = null;\n lastTokStart: number = 0;\n lastTokEnd: number = 0;\n\n // The context stack is used to track whether the apostrophe \"`\" starts\n // or ends a string template\n context: Array = [ct.brace];\n // Used to track whether a JSX element is allowed to form\n exprAllowed: boolean = true;\n\n // Used to signal to callers of `readWord1` whether the word\n // contained any escape sequences. This is needed because words with\n // escape sequences must not be interpreted as keywords.\n containsEsc: boolean = false;\n\n // This property is used to track the following errors\n // - StrictNumericEscape\n // - StrictOctalLiteral\n //\n // in a literal that occurs prior to/immediately after a \"use strict\" directive.\n\n // todo(JLHwung): set strictErrors to null and avoid recording string errors\n // after a non-directive is parsed\n strictErrors: Map = new Map();\n\n // Tokens length in token store\n tokensLength: number = 0;\n\n curPosition(): Position {\n return new Position(this.curLine, this.pos - this.lineStart);\n }\n\n clone(skipArrays?: boolean): State {\n const state = new State();\n const keys = Object.keys(this);\n for (let i = 0, length = keys.length; i < length; i++) {\n const key = keys[i];\n // $FlowIgnore\n let val = this[key];\n\n if (!skipArrays && Array.isArray(val)) {\n val = val.slice();\n }\n\n // $FlowIgnore\n state[key] = val;\n }\n\n return state;\n }\n}\n\nexport type LookaheadState = {\n pos: number,\n value: any,\n type: TokenType,\n start: number,\n end: number,\n /* Used only in readToken_mult_modulo */\n inType: boolean,\n};\n","// @flow\n\n/*:: declare var invariant; */\n\nimport type { Options } from \"../options\";\nimport * as N from \"../types\";\nimport * as charCodes from \"charcodes\";\nimport { isIdentifierStart, isIdentifierChar } from \"../util/identifier\";\nimport {\n tokenIsKeyword,\n tokenLabelName,\n tt,\n keywords as keywordTypes,\n type TokenType,\n} from \"./types\";\nimport { type TokContext, types as ct } from \"./context\";\nimport ParserErrors, { Errors, type ErrorTemplate } from \"../parser/error\";\nimport { SourceLocation } from \"../util/location\";\nimport {\n lineBreakG,\n isNewLine,\n isWhitespace,\n skipWhiteSpace,\n} from \"../util/whitespace\";\nimport State from \"./state\";\nimport type { LookaheadState } from \"./state\";\n\nconst VALID_REGEX_FLAGS = new Set([\n charCodes.lowercaseG,\n charCodes.lowercaseM,\n charCodes.lowercaseS,\n charCodes.lowercaseI,\n charCodes.lowercaseY,\n charCodes.lowercaseU,\n charCodes.lowercaseD,\n]);\n\n// The following character codes are forbidden from being\n// an immediate sibling of NumericLiteralSeparator _\n\nconst forbiddenNumericSeparatorSiblings = {\n decBinOct: [\n charCodes.dot,\n charCodes.uppercaseB,\n charCodes.uppercaseE,\n charCodes.uppercaseO,\n charCodes.underscore, // multiple separators are not allowed\n charCodes.lowercaseB,\n charCodes.lowercaseE,\n charCodes.lowercaseO,\n ],\n hex: [\n charCodes.dot,\n charCodes.uppercaseX,\n charCodes.underscore, // multiple separators are not allowed\n charCodes.lowercaseX,\n ],\n};\n\nconst allowedNumericSeparatorSiblings = {};\nallowedNumericSeparatorSiblings.bin = [\n // 0 - 1\n charCodes.digit0,\n charCodes.digit1,\n];\nallowedNumericSeparatorSiblings.oct = [\n // 0 - 7\n ...allowedNumericSeparatorSiblings.bin,\n\n charCodes.digit2,\n charCodes.digit3,\n charCodes.digit4,\n charCodes.digit5,\n charCodes.digit6,\n charCodes.digit7,\n];\nallowedNumericSeparatorSiblings.dec = [\n // 0 - 9\n ...allowedNumericSeparatorSiblings.oct,\n\n charCodes.digit8,\n charCodes.digit9,\n];\n\nallowedNumericSeparatorSiblings.hex = [\n // 0 - 9, A - F, a - f,\n ...allowedNumericSeparatorSiblings.dec,\n\n charCodes.uppercaseA,\n charCodes.uppercaseB,\n charCodes.uppercaseC,\n charCodes.uppercaseD,\n charCodes.uppercaseE,\n charCodes.uppercaseF,\n\n charCodes.lowercaseA,\n charCodes.lowercaseB,\n charCodes.lowercaseC,\n charCodes.lowercaseD,\n charCodes.lowercaseE,\n charCodes.lowercaseF,\n];\n\n// Object type used to represent tokens. Note that normally, tokens\n// simply exist as properties on the parser object. This is only\n// used for the onToken callback and the external tokenizer.\n\nexport class Token {\n constructor(state: State) {\n this.type = state.type;\n this.value = state.value;\n this.start = state.start;\n this.end = state.end;\n this.loc = new SourceLocation(state.startLoc, state.endLoc);\n }\n\n declare type: TokenType;\n declare value: any;\n declare start: number;\n declare end: number;\n declare loc: SourceLocation;\n}\n\n// ## Tokenizer\n\nexport default class Tokenizer extends ParserErrors {\n // Forward-declarations\n // parser/util.js\n /*::\n +hasPrecedingLineBreak: () => boolean;\n +unexpected: (pos?: ?number, messageOrType?: ErrorTemplate | TokenType) => empty;\n +expectPlugin: (name: string, pos?: ?number) => true;\n */\n\n isLookahead: boolean;\n\n // Token store.\n tokens: Array = [];\n\n constructor(options: Options, input: string) {\n super();\n this.state = new State();\n this.state.init(options);\n this.input = input;\n this.length = input.length;\n this.isLookahead = false;\n }\n\n pushToken(token: Token | N.Comment) {\n // Pop out invalid tokens trapped by try-catch parsing.\n // Those parsing branches are mainly created by typescript and flow plugins.\n this.tokens.length = this.state.tokensLength;\n this.tokens.push(token);\n ++this.state.tokensLength;\n }\n\n // Move to the next token\n\n next(): void {\n this.checkKeywordEscapes();\n if (this.options.tokens) {\n this.pushToken(new Token(this.state));\n }\n\n this.state.lastTokEnd = this.state.end;\n this.state.lastTokStart = this.state.start;\n this.state.lastTokEndLoc = this.state.endLoc;\n this.state.lastTokStartLoc = this.state.startLoc;\n this.nextToken();\n }\n\n // TODO\n\n eat(type: TokenType): boolean {\n if (this.match(type)) {\n this.next();\n return true;\n } else {\n return false;\n }\n }\n\n /**\n * Whether current token matches given type\n *\n * @param {TokenType} type\n * @returns {boolean}\n * @memberof Tokenizer\n */\n match(type: TokenType): boolean {\n return this.state.type === type;\n }\n\n /**\n * Create a LookaheadState from current parser state\n *\n * @param {State} state\n * @returns {LookaheadState}\n * @memberof Tokenizer\n */\n createLookaheadState(state: State): LookaheadState {\n return {\n pos: state.pos,\n value: null,\n type: state.type,\n start: state.start,\n end: state.end,\n lastTokEnd: state.end,\n context: [this.curContext()],\n inType: state.inType,\n };\n }\n\n /**\n * lookahead peeks the next token, skipping changes to token context and\n * comment stack. For performance it returns a limited LookaheadState\n * instead of full parser state.\n *\n * The { column, line } Loc info is not included in lookahead since such usage\n * is rare. Although it may return other location properties e.g. `curLine` and\n * `lineStart`, these properties are not listed in the LookaheadState interface\n * and thus the returned value is _NOT_ reliable.\n *\n * The tokenizer should make best efforts to avoid using any parser state\n * other than those defined in LookaheadState\n *\n * @returns {LookaheadState}\n * @memberof Tokenizer\n */\n lookahead(): LookaheadState {\n const old = this.state;\n // For performance we use a simpified tokenizer state structure\n // $FlowIgnore\n this.state = this.createLookaheadState(old);\n\n this.isLookahead = true;\n this.nextToken();\n this.isLookahead = false;\n\n const curr = this.state;\n this.state = old;\n return curr;\n }\n\n nextTokenStart(): number {\n return this.nextTokenStartSince(this.state.pos);\n }\n\n nextTokenStartSince(pos: number): number {\n skipWhiteSpace.lastIndex = pos;\n return skipWhiteSpace.test(this.input) ? skipWhiteSpace.lastIndex : pos;\n }\n\n lookaheadCharCode(): number {\n return this.input.charCodeAt(this.nextTokenStart());\n }\n\n codePointAtPos(pos: number): number {\n // The implementation is based on\n // https://source.chromium.org/chromium/chromium/src/+/master:v8/src/builtins/builtins-string-gen.cc;l=1455;drc=221e331b49dfefadbc6fa40b0c68e6f97606d0b3;bpv=0;bpt=1\n // We reimplement `codePointAt` because `codePointAt` is a V8 builtin which is not inlined by TurboFan (as of M91)\n // since `input` is mostly ASCII, an inlined `charCodeAt` wins here\n let cp = this.input.charCodeAt(pos);\n if ((cp & 0xfc00) === 0xd800 && ++pos < this.input.length) {\n const trail = this.input.charCodeAt(pos);\n if ((trail & 0xfc00) === 0xdc00) {\n cp = 0x10000 + ((cp & 0x3ff) << 10) + (trail & 0x3ff);\n }\n }\n return cp;\n }\n\n // Toggle strict mode. Re-reads the next number or string to please\n // pedantic tests (`\"use strict\"; 010;` should fail).\n\n setStrict(strict: boolean): void {\n this.state.strict = strict;\n if (strict) {\n // Throw an error for any string decimal escape found before/immediately\n // after a \"use strict\" directive. Strict mode will be set at parse\n // time for any literals that occur after the next node of the strict\n // directive.\n this.state.strictErrors.forEach((message, pos) =>\n /* eslint-disable @babel/development-internal/dry-error-messages */\n this.raise(pos, message),\n );\n this.state.strictErrors.clear();\n }\n }\n\n curContext(): TokContext {\n return this.state.context[this.state.context.length - 1];\n }\n\n // Read a single token, updating the parser object's token-related\n // properties.\n\n nextToken(): void {\n const curContext = this.curContext();\n if (!curContext.preserveSpace) this.skipSpace();\n this.state.start = this.state.pos;\n if (!this.isLookahead) this.state.startLoc = this.state.curPosition();\n if (this.state.pos >= this.length) {\n this.finishToken(tt.eof);\n return;\n }\n\n if (curContext === ct.template) {\n this.readTmplToken();\n } else {\n this.getTokenFromCode(this.codePointAtPos(this.state.pos));\n }\n }\n\n skipBlockComment(): N.CommentBlock | void {\n let startLoc;\n if (!this.isLookahead) startLoc = this.state.curPosition();\n const start = this.state.pos;\n const end = this.input.indexOf(\"*/\", start + 2);\n if (end === -1) throw this.raise(start, Errors.UnterminatedComment);\n\n this.state.pos = end + 2;\n lineBreakG.lastIndex = start + 2;\n while (lineBreakG.test(this.input) && lineBreakG.lastIndex <= end) {\n ++this.state.curLine;\n this.state.lineStart = lineBreakG.lastIndex;\n }\n\n // If we are doing a lookahead right now we need to advance the position (above code)\n // but we do not want to push the comment to the state.\n if (this.isLookahead) return;\n /*:: invariant(startLoc) */\n\n const comment = {\n type: \"CommentBlock\",\n value: this.input.slice(start + 2, end),\n start,\n end: end + 2,\n loc: new SourceLocation(startLoc, this.state.curPosition()),\n };\n if (this.options.tokens) this.pushToken(comment);\n return comment;\n }\n\n skipLineComment(startSkip: number): N.CommentLine | void {\n const start = this.state.pos;\n let startLoc;\n if (!this.isLookahead) startLoc = this.state.curPosition();\n let ch = this.input.charCodeAt((this.state.pos += startSkip));\n if (this.state.pos < this.length) {\n while (!isNewLine(ch) && ++this.state.pos < this.length) {\n ch = this.input.charCodeAt(this.state.pos);\n }\n }\n\n // If we are doing a lookahead right now we need to advance the position (above code)\n // but we do not want to push the comment to the state.\n if (this.isLookahead) return;\n /*:: invariant(startLoc) */\n\n const end = this.state.pos;\n const value = this.input.slice(start + startSkip, end);\n\n const comment = {\n type: \"CommentLine\",\n value,\n start,\n end,\n loc: new SourceLocation(startLoc, this.state.curPosition()),\n };\n if (this.options.tokens) this.pushToken(comment);\n return comment;\n }\n\n // Called at the start of the parse and after every token. Skips\n // whitespace and comments, and.\n\n skipSpace(): void {\n const spaceStart = this.state.pos;\n const comments = [];\n loop: while (this.state.pos < this.length) {\n const ch = this.input.charCodeAt(this.state.pos);\n switch (ch) {\n case charCodes.space:\n case charCodes.nonBreakingSpace:\n case charCodes.tab:\n ++this.state.pos;\n break;\n case charCodes.carriageReturn:\n if (\n this.input.charCodeAt(this.state.pos + 1) === charCodes.lineFeed\n ) {\n ++this.state.pos;\n }\n // fall through\n case charCodes.lineFeed:\n case charCodes.lineSeparator:\n case charCodes.paragraphSeparator:\n ++this.state.pos;\n ++this.state.curLine;\n this.state.lineStart = this.state.pos;\n break;\n\n case charCodes.slash:\n switch (this.input.charCodeAt(this.state.pos + 1)) {\n case charCodes.asterisk: {\n const comment = this.skipBlockComment();\n if (comment !== undefined) {\n this.addComment(comment);\n if (this.options.attachComment) comments.push(comment);\n }\n break;\n }\n\n case charCodes.slash: {\n const comment = this.skipLineComment(2);\n if (comment !== undefined) {\n this.addComment(comment);\n if (this.options.attachComment) comments.push(comment);\n }\n break;\n }\n\n default:\n break loop;\n }\n break;\n\n default:\n if (isWhitespace(ch)) {\n ++this.state.pos;\n } else if (ch === charCodes.dash && !this.inModule) {\n const pos = this.state.pos;\n if (\n this.input.charCodeAt(pos + 1) === charCodes.dash &&\n this.input.charCodeAt(pos + 2) === charCodes.greaterThan &&\n (spaceStart === 0 || this.state.lineStart > spaceStart)\n ) {\n // A `-->` line comment\n const comment = this.skipLineComment(3);\n if (comment !== undefined) {\n this.addComment(comment);\n if (this.options.attachComment) comments.push(comment);\n }\n } else {\n break loop;\n }\n } else if (ch === charCodes.lessThan && !this.inModule) {\n const pos = this.state.pos;\n if (\n this.input.charCodeAt(pos + 1) === charCodes.exclamationMark &&\n this.input.charCodeAt(pos + 2) === charCodes.dash &&\n this.input.charCodeAt(pos + 3) === charCodes.dash\n ) {\n // `