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node_modules/es5-ext/function/_define-length.js
| 54 lines
| 1.3 KiB
| application/javascript
| JavascriptLexer
|
| r789 | "use strict"; | |||
| var toPosInt = require("../number/to-pos-integer"); | ||||
| var test = function (arg1, arg2) { return arg2; }; | ||||
| var desc, defineProperty, generate, mixin; | ||||
| try { | ||||
| Object.defineProperty(test, "length", { | ||||
| configurable: true, | ||||
| writable: false, | ||||
| enumerable: false, | ||||
| value: 1 | ||||
| }); | ||||
| } | ||||
| catch (ignore) {} | ||||
| if (test.length === 1) { | ||||
| // ES6 | ||||
| desc = { configurable: true, writable: false, enumerable: false }; | ||||
| defineProperty = Object.defineProperty; | ||||
| module.exports = function (fn, length) { | ||||
| length = toPosInt(length); | ||||
| if (fn.length === length) return fn; | ||||
| desc.value = length; | ||||
| return defineProperty(fn, "length", desc); | ||||
| }; | ||||
| } else { | ||||
| mixin = require("../object/mixin"); | ||||
| generate = (function () { | ||||
| var cache = []; | ||||
| return function (length) { | ||||
| var args, i = 0; | ||||
| if (cache[length]) return cache[length]; | ||||
| args = []; | ||||
| while (length--) args.push("a" + (++i).toString(36)); | ||||
| // eslint-disable-next-line no-new-func | ||||
| return new Function( | ||||
| "fn", | ||||
| "return function (" + args.join(", ") + ") { return fn.apply(this, arguments); };" | ||||
| ); | ||||
| }; | ||||
| })(); | ||||
| module.exports = function (src, length) { | ||||
| var target; | ||||
| length = toPosInt(length); | ||||
| if (src.length === length) return src; | ||||
| target = generate(length)(src); | ||||
| try { mixin(target, src); } | ||||
| catch (ignore) {} | ||||
| return target; | ||||
| }; | ||||
| } | ||||