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48 lines
1.3 KiB
48 lines
1.3 KiB
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $SyntaxError = GetIntrinsic('%SyntaxError%');
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var has = require('has');
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var predicates = {
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// https://262.ecma-international.org/6.0/#sec-property-descriptor-specification-type
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'Property Descriptor': function isPropertyDescriptor(Type, Desc) {
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if (Type(Desc) !== 'Object') {
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return false;
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}
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var allowed = {
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'[[Configurable]]': true,
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'[[Enumerable]]': true,
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'[[Get]]': true,
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'[[Set]]': true,
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'[[Value]]': true,
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'[[Writable]]': true
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};
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for (var key in Desc) { // eslint-disable-line
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if (has(Desc, key) && !allowed[key]) {
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return false;
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}
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}
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var isData = has(Desc, '[[Value]]');
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var IsAccessor = has(Desc, '[[Get]]') || has(Desc, '[[Set]]');
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if (isData && IsAccessor) {
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throw new $TypeError('Property Descriptors may not be both accessor and data descriptors');
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}
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return true;
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}
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};
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module.exports = function assertRecord(Type, recordType, argumentName, value) {
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var predicate = predicates[recordType];
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if (typeof predicate !== 'function') {
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throw new $SyntaxError('unknown record type: ' + recordType);
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}
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if (!predicate(Type, value)) {
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throw new $TypeError(argumentName + ' must be a ' + recordType);
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}
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};
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