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- 'use strict';
- var $TypeError = require('es-errors/type');
- var IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
- var TypedArrayElementSize = require('./TypedArrayElementSize');
- var TypedArrayLength = require('./TypedArrayLength');
- var isTypedArrayWithBufferWitnessRecord = require('../helpers/records/typed-array-with-buffer-witness-record');
- var typedArrayByteLength = require('typed-array-byte-length');
- // https://262.ecma-international.org/15.0/#sec-typedarraybytelength
- module.exports = function TypedArrayByteLength(taRecord) {
- if (!isTypedArrayWithBufferWitnessRecord(taRecord)) {
- throw new $TypeError('Assertion failed: `taRecord` must be a TypedArray With Buffer Witness Record');
- }
- if (IsTypedArrayOutOfBounds(taRecord)) {
- return 0; // step 1
- }
- var length = TypedArrayLength(taRecord); // step 2
- if (length === 0) {
- return 0; // step 3
- }
- var O = taRecord['[[Object]]']; // step 4
- var byteLength = typedArrayByteLength(O);
- if (byteLength !== 'AUTO') {
- return byteLength; // step 5
- }
- var elementSize = TypedArrayElementSize(O); // step 6
- return length * elementSize; // step 7
- };
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