43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
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'use strict';
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var callBind = require('call-bind');
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var callBound = require('call-bind/callBound');
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var GetIntrinsic = require('get-intrinsic');
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var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%', true);
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/** @type {undefined | ((receiver: ArrayBuffer) => number) | ((receiver: unknown) => never)} */
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var $byteLength = callBound('ArrayBuffer.prototype.byteLength', true);
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var $toString = callBound('Object.prototype.toString');
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// in node 0.10, ArrayBuffers have no prototype methods, but have an own slot-checking `slice` method
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var abSlice = !!$ArrayBuffer && !$byteLength && new $ArrayBuffer(0).slice;
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var $abSlice = !!abSlice && callBind(abSlice);
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/** @type {import('.')} */
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module.exports = $byteLength || $abSlice
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? function isArrayBuffer(obj) {
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if (!obj || typeof obj !== 'object') {
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return false;
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}
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try {
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if ($byteLength) {
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// @ts-expect-error no idea why TS can't handle the overload
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$byteLength(obj);
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} else {
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// @ts-expect-error TS chooses not to type-narrow inside a closure
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$abSlice(obj, 0);
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}
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return true;
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} catch (e) {
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return false;
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}
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}
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: $ArrayBuffer
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// in node 0.8, ArrayBuffers have no prototype or own methods, but also no Symbol.toStringTag
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? function isArrayBuffer(obj) {
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return $toString(obj) === '[object ArrayBuffer]';
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}
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: function isArrayBuffer(obj) { // eslint-disable-line no-unused-vars
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return false;
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};
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