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58 lines
1.2 KiB
58 lines
1.2 KiB
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = hoistVariables;
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var _t = require("@babel/types");
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const {
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assignmentExpression,
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expressionStatement,
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identifier
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} = _t;
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const visitor = {
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Scope(path, state) {
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if (state.kind === "let") path.skip();
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},
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FunctionParent(path) {
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path.skip();
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},
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VariableDeclaration(path, state) {
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if (state.kind && path.node.kind !== state.kind) return;
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const nodes = [];
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const declarations = path.get("declarations");
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let firstId;
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for (const declar of declarations) {
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firstId = declar.node.id;
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if (declar.node.init) {
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nodes.push(expressionStatement(assignmentExpression("=", declar.node.id, declar.node.init)));
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}
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for (const name of Object.keys(declar.getBindingIdentifiers())) {
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state.emit(identifier(name), name, declar.node.init !== null);
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}
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}
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if (path.parentPath.isFor({
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left: path.node
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})) {
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path.replaceWith(firstId);
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} else {
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path.replaceWithMultiple(nodes);
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}
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}
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};
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function hoistVariables(path, emit, kind = "var") {
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path.traverse(visitor, {
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kind,
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emit
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});
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} |