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node_modules/core-js/internals/make-built-in.js

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+'use strict';
+var uncurryThis = require('../internals/function-uncurry-this');
+var fails = require('../internals/fails');
+var isCallable = require('../internals/is-callable');
+var hasOwn = require('../internals/has-own-property');
+var DESCRIPTORS = require('../internals/descriptors');
+var CONFIGURABLE_FUNCTION_NAME = require('../internals/function-name').CONFIGURABLE;
+var inspectSource = require('../internals/inspect-source');
+var InternalStateModule = require('../internals/internal-state');
+
+var enforceInternalState = InternalStateModule.enforce;
+var getInternalState = InternalStateModule.get;
+var $String = String;
+// eslint-disable-next-line es/no-object-defineproperty -- safe
+var defineProperty = Object.defineProperty;
+var stringSlice = uncurryThis(''.slice);
+var replace = uncurryThis(''.replace);
+var join = uncurryThis([].join);
+
+var CONFIGURABLE_LENGTH = DESCRIPTORS && !fails(function () {
+  return defineProperty(function () { /* empty */ }, 'length', { value: 8 }).length !== 8;
+});
+
+var TEMPLATE = String(String).split('String');
+
+var makeBuiltIn = module.exports = function (value, name, options) {
+  if (stringSlice($String(name), 0, 7) === 'Symbol(') {
+    name = '[' + replace($String(name), /^Symbol\(([^)]*)\)/, '$1') + ']';
+  }
+  if (options && options.getter) name = 'get ' + name;
+  if (options && options.setter) name = 'set ' + name;
+  if (!hasOwn(value, 'name') || (CONFIGURABLE_FUNCTION_NAME && value.name !== name)) {
+    if (DESCRIPTORS) defineProperty(value, 'name', { value: name, configurable: true });
+    else value.name = name;
+  }
+  if (CONFIGURABLE_LENGTH && options && hasOwn(options, 'arity') && value.length !== options.arity) {
+    defineProperty(value, 'length', { value: options.arity });
+  }
+  try {
+    if (options && hasOwn(options, 'constructor') && options.constructor) {
+      if (DESCRIPTORS) defineProperty(value, 'prototype', { writable: false });
+    // in V8 ~ Chrome 53, prototypes of some methods, like `Array.prototype.values`, are non-writable
+    } else if (value.prototype) value.prototype = undefined;
+  } catch (error) { /* empty */ }
+  var state = enforceInternalState(value);
+  if (!hasOwn(state, 'source')) {
+    state.source = join(TEMPLATE, typeof name == 'string' ? name : '');
+  } return value;
+};
+
+// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
+// eslint-disable-next-line no-extend-native -- required
+Function.prototype.toString = makeBuiltIn(function toString() {
+  return isCallable(this) && getInternalState(this).source || inspectSource(this);
+}, 'toString');