1 var global = require('../internals/global');
2 var isCallable = require('../internals/is-callable');
3 var tryToString = require('../internals/try-to-string');
5 var TypeError = global.TypeError;
7 // `Assert: IsCallable(argument) is true`
8 module.exports = function (argument) {
9 if (isCallable(argument)) return argument;
10 throw TypeError(tryToString(argument) + ' is not a function');