35 lines
934 B
Plaintext
35 lines
934 B
Plaintext
'use strict';
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var $TypeError = require('es-errors/type');
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var isTypedArray = require('is-typed-array');
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var typedArrayBuffer = require('typed-array-buffer');
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var typedArrayLength = require('typed-array-length');
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var IsFixedLengthArrayBuffer = require('./IsFixedLengthArrayBuffer');
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var IsSharedArrayBuffer = require('./IsSharedArrayBuffer');
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// https://262.ecma-international.org/16.0/#sec-istypedarrayfixedlength
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module.exports = function IsTypedArrayFixedLength(O) {
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if (!isTypedArray(O)) {
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throw new $TypeError('Assertion failed: `obj` must be a Typed Array');
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}
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// 2. Let buffer be O.[[ViewedArrayBuffer]].
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var buffer = typedArrayBuffer(O); // step 2
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var isFixed = IsFixedLengthArrayBuffer(buffer);
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var length = isFixed ? typedArrayLength(O) : 'AUTO';
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if (length === 'AUTO') {
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return false; // step 1
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}
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if (!isFixed && !IsSharedArrayBuffer(buffer)) {
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return false; // step 3
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}
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return true; // step 4
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};
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