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- 'use strict';
- var GetIntrinsic = require('get-intrinsic');
- var $RangeError = GetIntrinsic('%RangeError%');
- var $TypeError = GetIntrinsic('%TypeError%');
- var callBound = require('call-bind/callBound');
- // node 0.10 doesn't have a prototype method
- var $byteOffset = callBound('%TypedArray.prototype.byteOffset%', true) || function (x) { return x.byteOffset; };
- var ToIndex = require('./ToIndex');
- var TypedArrayElementSize = require('./TypedArrayElementSize');
- var isTypedArray = require('is-typed-array');
- var typedArrayLength = require('typed-array-length');
- // https://262.ecma-international.org/13.0/#sec-validateatomicaccess
- module.exports = function ValidateAtomicAccess(typedArray, requestIndex) {
- if (!isTypedArray(typedArray)) {
- throw new $TypeError('Assertion failed: `typedArray` must be a TypedArray');
- }
- var length = typedArrayLength(typedArray); // step 1
- var accessIndex = ToIndex(requestIndex); // step 2
- /*
- // this assertion can never be reached
- if (!(accessIndex >= 0)) {
- throw new $TypeError('Assertion failed: accessIndex >= 0'); // step 4
- }
- */
- if (accessIndex >= length) {
- throw new $RangeError('index out of range'); // step 4
- }
- var elementSize = TypedArrayElementSize(typedArray); // step 5
- var offset = $byteOffset(typedArray); // step 6
- return (accessIndex * elementSize) + offset; // step 7
- };
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