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  1. 'use strict';
  2. var $TypeError = require('es-errors/type');
  3. var IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
  4. var TypedArrayElementSize = require('./TypedArrayElementSize');
  5. var TypedArrayLength = require('./TypedArrayLength');
  6. var isTypedArrayWithBufferWitnessRecord = require('../helpers/records/typed-array-with-buffer-witness-record');
  7. var typedArrayByteLength = require('typed-array-byte-length');
  8. // https://262.ecma-international.org/15.0/#sec-typedarraybytelength
  9. module.exports = function TypedArrayByteLength(taRecord) {
  10. if (!isTypedArrayWithBufferWitnessRecord(taRecord)) {
  11. throw new $TypeError('Assertion failed: `taRecord` must be a TypedArray With Buffer Witness Record');
  12. }
  13. if (IsTypedArrayOutOfBounds(taRecord)) {
  14. return 0; // step 1
  15. }
  16. var length = TypedArrayLength(taRecord); // step 2
  17. if (length === 0) {
  18. return 0; // step 3
  19. }
  20. var O = taRecord['[[Object]]']; // step 4
  21. var byteLength = typedArrayByteLength(O);
  22. if (byteLength !== 'AUTO') {
  23. return byteLength; // step 5
  24. }
  25. var elementSize = TypedArrayElementSize(O); // step 6
  26. return length * elementSize; // step 7
  27. };