assert-is-callable-x

If IsCallable(callbackfn) is false, throw a TypeError exception.

module.exports(value) ⇒ * ⏏

Tests callback to see if it is callable, throws a TypeError if it is not. Otherwise returns the callback.

Kind: Exported function
Returns: * - Returns callback if it is callable.
Throws:

• TypeError Throws if callback is not a callable.

| Param | Type | Description | | --------- | ------------------- | ----------------------------- | | value | * | The argument to be tested. | | [message] | string | Optional alternative message. |

Example

import assertIsCallable from 'assert-is-callable-x';

const primitive = true;
const mySymbol = Symbol('mySymbol');
const symObj = Object(mySymbol);
const object = {};
const fn = function fn() {};

assertIsCallable(primitive); // TypeError 'true is not callable'.
assertIsCallable(object); // TypeError '#<Object> is not callable'.
assertIsCallable(mySymbol); // TypeError 'Symbol(mySymbol) is not callable'.
assertIsCallable(symObj); // TypeError '#<Object> is not callable'.
console.log(assertIsCallable(fn)); // Returns fn.