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- 'use strict';
- var hasOwn = require('hasown');
- var hasUnscopables = typeof Symbol === 'function' && typeof Symbol.unscopables === 'symbol';
- var map = hasUnscopables && Array.prototype[Symbol.unscopables];
- var $TypeError = TypeError;
- /** @type {import('.')} */
- module.exports = function shimUnscopables(method) {
- if (typeof method !== 'string' || !method) {
- throw new $TypeError('method must be a non-empty string');
- }
- if (!hasOwn(Array.prototype, method)) {
- throw new $TypeError('method must be on Array.prototype');
- }
- if (hasUnscopables && map) {
- map[method] = true;
- }
- };
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