main
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Last change
on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
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Update repo after prototype presentation
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100644
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File size:
480 bytes
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| [d565449] | 1 | 'use strict';
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| 2 |
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| 3 | var callBound = require('call-bind/callBound');
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| 4 |
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| 5 | var $PromiseThen = callBound('Promise.prototype.then', true);
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| 6 |
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| 7 | var Type = require('./Type');
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| 8 |
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| 9 | // https://262.ecma-international.org/6.0/#sec-ispromise
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| 10 |
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| 11 | module.exports = function IsPromise(x) {
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| 12 | if (Type(x) !== 'Object') {
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| 13 | return false;
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| 14 | }
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| 15 | if (!$PromiseThen) { // Promises are not supported
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| 16 | return false;
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| 17 | }
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| 18 | try {
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| 19 | $PromiseThen(x); // throws if not a promise
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| 20 | } catch (e) {
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| 21 | return false;
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| 22 | }
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| 23 | return true;
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| 24 | };
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