assert-is-callable-x

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assert-is-callable-x

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

$3

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

``js
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 '#