Sha256: 5ca44dded2517fb5671c72d3b6c225c6fa37b23368753e57099d509dcaea758b
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Versions: 583
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Stored size: 1.12 KB
Contents
'use strict';
var GetIntrinsic = require('../GetIntrinsic.js');
var $construct = GetIntrinsic('%Reflect.construct%', true);
var DefinePropertyOrThrow = require('./DefinePropertyOrThrow');
try {
DefinePropertyOrThrow({}, '', { '[[Get]]': function () {} });
} catch (e) {
// Accessor properties aren't supported
DefinePropertyOrThrow = null;
}
// https://262.ecma-international.org/6.0/#sec-isconstructor
if (DefinePropertyOrThrow && $construct) {
var isConstructorMarker = {};
var badArrayLike = {};
DefinePropertyOrThrow(badArrayLike, 'length', {
'[[Get]]': function () {
throw isConstructorMarker;
},
'[[Enumerable]]': true
});
module.exports = function IsConstructor(argument) {
try {
// `Reflect.construct` invokes `IsConstructor(target)` before `Get(args, 'length')`:
$construct(argument, badArrayLike);
} catch (err) {
return err === isConstructorMarker;
}
};
} else {
module.exports = function IsConstructor(argument) {
// unfortunately there's no way to truly check this without try/catch `new argument` in old environments
return typeof argument === 'function' && !!argument.prototype;
};
}
Version data entries
583 entries across 61 versions & 3 rubygems