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Last change
on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
Update repo after prototype presentation
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File size:
1.4 KB
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[d565449] | 1 | 'use strict';
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| 2 |
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| 3 | var callBind = require('call-bind');
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| 4 | var callBound = require('call-bind/callBound');
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| 5 | var GetIntrinsic = require('get-intrinsic');
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| 6 |
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| 7 | var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%', true);
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| 8 | /** @type {undefined | ((receiver: ArrayBuffer) => number) | ((receiver: unknown) => never)} */
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| 9 | var $byteLength = callBound('ArrayBuffer.prototype.byteLength', true);
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| 10 | var $toString = callBound('Object.prototype.toString');
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| 11 |
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| 12 | // in node 0.10, ArrayBuffers have no prototype methods, but have an own slot-checking `slice` method
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| 13 | var abSlice = !!$ArrayBuffer && !$byteLength && new $ArrayBuffer(0).slice;
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| 14 | var $abSlice = !!abSlice && callBind(abSlice);
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| 15 |
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| 16 | /** @type {import('.')} */
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| 17 | module.exports = $byteLength || $abSlice
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| 18 | ? function isArrayBuffer(obj) {
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| 19 | if (!obj || typeof obj !== 'object') {
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| 20 | return false;
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| 21 | }
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| 22 | try {
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| 23 | if ($byteLength) {
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| 24 | // @ts-expect-error no idea why TS can't handle the overload
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| 25 | $byteLength(obj);
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| 26 | } else {
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| 27 | // @ts-expect-error TS chooses not to type-narrow inside a closure
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| 28 | $abSlice(obj, 0);
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| 29 | }
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| 30 | return true;
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| 31 | } catch (e) {
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| 32 | return false;
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| 33 | }
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| 34 | }
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| 35 | : $ArrayBuffer
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| 36 | // in node 0.8, ArrayBuffers have no prototype or own methods, but also no Symbol.toStringTag
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| 37 | ? function isArrayBuffer(obj) {
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| 38 | return $toString(obj) === '[object ArrayBuffer]';
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| 39 | }
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| 40 | : function isArrayBuffer(obj) { // eslint-disable-line no-unused-vars
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| 41 | return false;
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| 42 | };
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