30 lines
966 B
JavaScript
30 lines
966 B
JavaScript
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'use strict';
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var $TypeError = require('es-errors/type');
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var callBound = require('call-bind/callBound');
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var $arrayBufferResizable = callBound('%ArrayBuffer.prototype.resizable%', true);
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var $sharedArrayGrowable = callBound('%SharedArrayBuffer.prototype.growable%', true);
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var isArrayBuffer = require('is-array-buffer');
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var isSharedArrayBuffer = require('is-shared-array-buffer');
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// https://262.ecma-international.org/15.0/#sec-isfixedlengtharraybuffer
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module.exports = function IsFixedLengthArrayBuffer(arrayBuffer) {
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var isAB = isArrayBuffer(arrayBuffer);
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var isSAB = isSharedArrayBuffer(arrayBuffer);
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if (!isAB && !isSAB) {
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throw new $TypeError('Assertion failed: `arrayBuffer` must be an ArrayBuffer or SharedArrayBuffer');
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}
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if (isAB && $arrayBufferResizable) {
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return !$arrayBufferResizable(arrayBuffer); // step 1
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}
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if (isSAB && $sharedArrayGrowable) {
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return !$sharedArrayGrowable(arrayBuffer); // step 1
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}
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return true; // step 2
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};
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