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node_modules/core-js/internals/inspect-source.js

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+'use strict';
+var uncurryThis = require('../internals/function-uncurry-this');
+var isCallable = require('../internals/is-callable');
+var store = require('../internals/shared-store');
+
+var functionToString = uncurryThis(Function.toString);
+
+// this helper broken in `core-js@3.4.1-3.4.4`, so we can't use `shared` helper
+if (!isCallable(store.inspectSource)) {
+  store.inspectSource = function (it) {
+    return functionToString(it);
+  };
+}
+
+module.exports = store.inspectSource;