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- 'use strict';
- const success = (a) => [null, a];
- const fail = (a) => [a];
- const noArg = (f, a) => () => f(...a);
- module.exports = (fn, ...args) => {
- check(fn);
-
- return Promise.resolve()
- .then(noArg(fn, args))
- .then(success)
- .catch(fail);
- };
- function check(fn) {
- if (typeof fn !== 'function')
- throw Error('fn should be a function!');
- }
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