make-built-in.js 2.2 KB

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  1. var fails = require('../internals/fails');
  2. var isCallable = require('../internals/is-callable');
  3. var hasOwn = require('../internals/has-own-property');
  4. var DESCRIPTORS = require('../internals/descriptors');
  5. var CONFIGURABLE_FUNCTION_NAME = require('../internals/function-name').CONFIGURABLE;
  6. var inspectSource = require('../internals/inspect-source');
  7. var InternalStateModule = require('../internals/internal-state');
  8. var enforceInternalState = InternalStateModule.enforce;
  9. var getInternalState = InternalStateModule.get;
  10. // eslint-disable-next-line es-x/no-object-defineproperty -- safe
  11. var defineProperty = Object.defineProperty;
  12. var CONFIGURABLE_LENGTH = DESCRIPTORS && !fails(function () {
  13. return defineProperty(function () { /* empty */ }, 'length', { value: 8 }).length !== 8;
  14. });
  15. var TEMPLATE = String(String).split('String');
  16. var makeBuiltIn = module.exports = function (value, name, options) {
  17. if (String(name).slice(0, 7) === 'Symbol(') {
  18. name = '[' + String(name).replace(/^Symbol\(([^)]*)\)/, '$1') + ']';
  19. }
  20. if (options && options.getter) name = 'get ' + name;
  21. if (options && options.setter) name = 'set ' + name;
  22. if (!hasOwn(value, 'name') || (CONFIGURABLE_FUNCTION_NAME && value.name !== name)) {
  23. defineProperty(value, 'name', { value: name, configurable: true });
  24. }
  25. if (CONFIGURABLE_LENGTH && options && hasOwn(options, 'arity') && value.length !== options.arity) {
  26. defineProperty(value, 'length', { value: options.arity });
  27. }
  28. if (options && hasOwn(options, 'constructor') && options.constructor) {
  29. if (DESCRIPTORS) try {
  30. defineProperty(value, 'prototype', { writable: false });
  31. } catch (error) { /* empty */ }
  32. } else value.prototype = undefined;
  33. var state = enforceInternalState(value);
  34. if (!hasOwn(state, 'source')) {
  35. state.source = TEMPLATE.join(typeof name == 'string' ? name : '');
  36. } return value;
  37. };
  38. // add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
  39. // eslint-disable-next-line no-extend-native -- required
  40. Function.prototype.toString = makeBuiltIn(function toString() {
  41. return isCallable(this) && getInternalState(this).source || inspectSource(this);
  42. }, 'toString');