resthen

Is a simple yet powerful tool for handling promises to callback. There are modules that does not support async/await or promises, resthen can solve that issue.

Example, koa-router method param does not support async/await or promises.

    import Router from 'koa-router';
    import resthen from 'resthen';

    async function getUser(id) {
      // some async request to datasource
    }

    const router = new Router();
    router.param('user', (val, ctx, next) => {
      return resthen(getUser(val), (err, res) => {
        if (err) {
          throw err;
        }

        ctx[params] = res;
        next();
      });
    }