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node_modules/is-callable/index.js
| 37 lines
| 1.1 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var fnToStr = Function.prototype.toString; | ||||
| var constructorRegex = /^\s*class\b/; | ||||
| var isES6ClassFn = function isES6ClassFunction(value) { | ||||
| try { | ||||
| var fnStr = fnToStr.call(value); | ||||
| return constructorRegex.test(fnStr); | ||||
| } catch (e) { | ||||
| return false; // not a function | ||||
| } | ||||
| }; | ||||
| var tryFunctionObject = function tryFunctionToStr(value) { | ||||
| try { | ||||
| if (isES6ClassFn(value)) { return false; } | ||||
| fnToStr.call(value); | ||||
| return true; | ||||
| } catch (e) { | ||||
| return false; | ||||
| } | ||||
| }; | ||||
| var toStr = Object.prototype.toString; | ||||
| var fnClass = '[object Function]'; | ||||
| var genClass = '[object GeneratorFunction]'; | ||||
| var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol'; | ||||
| module.exports = function isCallable(value) { | ||||
| if (!value) { return false; } | ||||
| if (typeof value !== 'function' && typeof value !== 'object') { return false; } | ||||
| if (typeof value === 'function' && !value.prototype) { return true; } | ||||
| if (hasToStringTag) { return tryFunctionObject(value); } | ||||
| if (isES6ClassFn(value)) { return false; } | ||||
| var strClass = toStr.call(value); | ||||
| return strClass === fnClass || strClass === genClass; | ||||
| }; | ||||