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esnext.function.metadata.js
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'use strict'; var wellKnownSymbol = require('../internals/well-known-symbol'); var defineProperty = require('../internals/object-define-property').f; var METADATA = wellKnownSymbol('metadata'); var FunctionPrototype = Function.prototype; // Function.prototype[@@metadata] // https://github.com/tc39/proposal-decorator-metadata if (FunctionPrototype[METADATA] === undefined) { defineProperty(FunctionPrototype, METADATA, { value: null }); }