40 lines
856 B
JavaScript
40 lines
856 B
JavaScript
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'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%');
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var $DataView = GetIntrinsic('%DataView%', true);
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var callBound = require('call-bind/callBound');
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// node <= 0.10, < 0.11.4 has a nonconfigurable own property instead of a prototype getter
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var $dataViewBuffer = callBound('DataView.prototype.buffer', true);
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var isTypedArray = require('is-typed-array');
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/** @type {import('.')} */
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module.exports = function isDataView(x) {
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if (!x || typeof x !== 'object' || !$DataView || isTypedArray(x)) {
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return false;
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}
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if ($dataViewBuffer) {
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try {
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$dataViewBuffer(x);
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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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if (
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('getInt8' in x)
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&& typeof x.getInt8 === 'function'
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&& x.getInt8 === new $DataView(new $ArrayBuffer(1)).getInt8
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) {
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return true;
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}
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return false;
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};
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