37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
'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;
|
|
};
|