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node_modules/core-js/internals/function-bind-context.js

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+'use strict';
+var uncurryThis = require('../internals/function-uncurry-this-clause');
+var aCallable = require('../internals/a-callable');
+var NATIVE_BIND = require('../internals/function-bind-native');
+
+var bind = uncurryThis(uncurryThis.bind);
+
+// optional / simple context binding
+module.exports = function (fn, that) {
+  aCallable(fn);
+  return that === undefined ? fn : NATIVE_BIND ? bind(fn, that) : function (/* ...args */) {
+    return fn.apply(that, arguments);
+  };
+};