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node_modules/core-js-pure/modules/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
+  });
+}