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- 'use strict';
- var GetIntrinsic = require('get-intrinsic');
- var $TypeError = GetIntrinsic('%TypeError%');
- var $SyntaxError = GetIntrinsic('%SyntaxError%');
- var has = require('has');
- var isMatchRecord = require('./isMatchRecord');
- var predicates = {
- // https://262.ecma-international.org/6.0/#sec-property-descriptor-specification-type
- 'Property Descriptor': function isPropertyDescriptor(Desc) {
- var allowed = {
- '[[Configurable]]': true,
- '[[Enumerable]]': true,
- '[[Get]]': true,
- '[[Set]]': true,
- '[[Value]]': true,
- '[[Writable]]': true
- };
- for (var key in Desc) { // eslint-disable-line
- if (has(Desc, key) && !allowed[key]) {
- return false;
- }
- }
- var isData = has(Desc, '[[Value]]');
- var IsAccessor = has(Desc, '[[Get]]') || has(Desc, '[[Set]]');
- if (isData && IsAccessor) {
- throw new $TypeError('Property Descriptors may not be both accessor and data descriptors');
- }
- return true;
- },
- // https://262.ecma-international.org/13.0/#sec-match-records
- 'Match Record': isMatchRecord,
- 'Iterator Record': function isIteratorRecord(value) {
- return has(value, '[[Iterator]]') && has(value, '[[NextMethod]]') && has(value, '[[Done]]');
- },
- 'PromiseCapability Record': function isPromiseCapabilityRecord(value) {
- return value
- && has(value, '[[Resolve]]')
- && typeof value['[[Resolve]]'] === 'function'
- && has(value, '[[Reject]]')
- && typeof value['[[Reject]]'] === 'function'
- && has(value, '[[Promise]]')
- && value['[[Promise]]']
- && typeof value['[[Promise]]'].then === 'function';
- },
- 'AsyncGeneratorRequest Record': function isAsyncGeneratorRequestRecord(value) {
- return value
- && has(value, '[[Completion]]') // TODO: confirm is a completion record
- && has(value, '[[Capability]]')
- && predicates['PromiseCapability Record'](value['[[Capability]]']);
- }
- };
- module.exports = function assertRecord(Type, recordType, argumentName, value) {
- var predicate = predicates[recordType];
- if (typeof predicate !== 'function') {
- throw new $SyntaxError('unknown record type: ' + recordType);
- }
- if (Type(value) !== 'Object' || !predicate(value)) {
- throw new $TypeError(argumentName + ' must be a ' + recordType);
- }
- };
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