22 lines
546 B
JavaScript
22 lines
546 B
JavaScript
'use strict';
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var has = require('has');
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var hasUnscopables = typeof Symbol === 'function' && typeof Symbol.unscopables === 'symbol';
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var map = hasUnscopables && Array.prototype[Symbol.unscopables];
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var $TypeError = TypeError;
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module.exports = function shimUnscopables(method) {
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if (typeof method !== 'string' || !method) {
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throw new $TypeError('method must be a non-empty string');
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}
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if (!has(Array.prototype, method)) {
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throw new $TypeError('method must be on Array.prototype');
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}
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if (hasUnscopables) {
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map[method] = true;
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}
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};
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