JSモジュール - Qiita

import funHooks from 'fun-hooks'; let createHook = funcHooks({ useProxy: false, ready: funHook.ASYNC | funcHooks.QUEUE }); // Sync (before, after) function sum(a, b) { return a + b; } let hookedSum = createHook('sync', sum); // before hookedSum.before(function(next, a, b) { a = a + 1 next(a, b); }); // after hookedSum.after(function(next, result) { next(result + 1); }); let result = hookedSum(1, 1