You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.3 KiB
75 lines
2.3 KiB
4 years ago
|
'use strict';
|
||
|
|
|
||
|
|
var fnToStr = Function.prototype.toString;
|
||
|
|
var reflectApply = typeof Reflect === 'object' && Reflect !== null && Reflect.apply;
|
||
|
|
var badArrayLike;
|
||
|
|
var isCallableMarker;
|
||
|
|
if (typeof reflectApply === 'function' && typeof Object.defineProperty === 'function') {
|
||
|
|
try {
|
||
|
|
badArrayLike = Object.defineProperty({}, 'length', {
|
||
|
|
get: function () {
|
||
|
|
throw isCallableMarker;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
isCallableMarker = {};
|
||
|
|
// eslint-disable-next-line no-throw-literal
|
||
|
|
reflectApply(function () { throw 42; }, null, badArrayLike);
|
||
|
|
} catch (_) {
|
||
|
|
if (_ !== isCallableMarker) {
|
||
|
|
reflectApply = null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
reflectApply = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
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' && !!Symbol.toStringTag; // better: use `has-tostringtag`
|
||
|
|
/* globals document: false */
|
||
|
|
var documentDotAll = typeof document === 'object' && typeof document.all === 'undefined' && document.all !== undefined ? document.all : {};
|
||
|
|
|
||
|
|
module.exports = reflectApply
|
||
|
|
? function isCallable(value) {
|
||
|
|
if (value === documentDotAll) { return true; }
|
||
|
|
if (!value) { return false; }
|
||
|
|
if (typeof value !== 'function' && typeof value !== 'object') { return false; }
|
||
|
|
if (typeof value === 'function' && !value.prototype) { return true; }
|
||
|
|
try {
|
||
|
|
reflectApply(value, null, badArrayLike);
|
||
|
|
} catch (e) {
|
||
|
|
if (e !== isCallableMarker) { return false; }
|
||
|
|
}
|
||
|
|
return !isES6ClassFn(value);
|
||
|
|
}
|
||
|
|
: function isCallable(value) {
|
||
|
|
if (value === documentDotAll) { return true; }
|
||
|
|
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;
|
||
|
|
};
|