GeneratorResume.js 914 B

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  1. 'use strict';
  2. var $TypeError = require('es-errors/type');
  3. var CreateIteratorResultObject = require('./CreateIteratorResultObject');
  4. var GeneratorValidate = require('./GeneratorValidate');
  5. var SLOT = require('internal-slot');
  6. // https://262.ecma-international.org/16.0/#sec-generatorresume
  7. module.exports = function GeneratorResume(generator, value, generatorBrand) {
  8. var state = GeneratorValidate(generator, generatorBrand); // step 1
  9. if (state === 'COMPLETED') {
  10. return CreateIteratorResultObject(void undefined, true); // step 2
  11. }
  12. if (state !== 'SUSPENDED-START' && state !== 'SUSPENDED-YIELD') {
  13. throw new $TypeError('Assertion failed: generator state is unexpected: ' + state); // step 3
  14. }
  15. var genContext = SLOT.get(generator, '[[GeneratorContext]]');
  16. SLOT.set(generator, '[[GeneratorState]]', 'EXECUTING'); // step 7
  17. var result = genContext(value); // steps 5-6, 8-10
  18. return result;
  19. };