- 'use strict';
 
- var isCallable = require('../internals/is-callable');
 
- var tryToString = require('../internals/try-to-string');
 
- var $TypeError = TypeError;
 
- // `Assert: IsCallable(argument) is true`
 
- module.exports = function (argument) {
 
-   if (isCallable(argument)) return argument;
 
-   throw new $TypeError(tryToString(argument) + ' is not a function');
 
- };
 
 
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