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node_modules/core-js/modules/es6.function.has-instance.js
| 13 lines
| 664 B
| application/javascript
| JavascriptLexer
|
r789 | 'use strict'; | |||
var isObject = require('./_is-object'); | ||||
var getPrototypeOf = require('./_object-gpo'); | ||||
var HAS_INSTANCE = require('./_wks')('hasInstance'); | ||||
var FunctionProto = Function.prototype; | ||||
// 19.2.3.6 Function.prototype[@@hasInstance](V) | ||||
if (!(HAS_INSTANCE in FunctionProto)) require('./_object-dp').f(FunctionProto, HAS_INSTANCE, { value: function (O) { | ||||
if (typeof this != 'function' || !isObject(O)) return false; | ||||
if (!isObject(this.prototype)) return O instanceof this; | ||||
// for environment w/o native `@@hasInstance` logic enough `instanceof`, but add this: | ||||
while (O = getPrototypeOf(O)) if (this.prototype === O) return true; | ||||
return false; | ||||
} }); | ||||