11 lines
341 B
JavaScript
11 lines
341 B
JavaScript
'use strict';
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var tryToString = require('../internals/try-to-string');
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var $TypeError = TypeError;
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// Perform ? RequireInternalSlot(M, [[WeakSetData]])
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module.exports = function (it) {
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if (typeof it == 'object' && 'has' in it && 'add' in it && 'delete' in it) return it;
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throw new $TypeError(tryToString(it) + ' is not a weakset');
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};
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