asyncwrap.js

// Utilities for express.

/**
 * Wraps request handler and calls next() on error.
 * @param {Function} reqHandler express request handler. It doesn't have to return Promise.
 */
function asyncWrap(reqHandler) {
    async function handlerWrap(req, res, next) {
        try {
            // reqHandler might not return Promise. So, can't do reqHandler().catch();
            return await reqHandler(req, res, next);
        } catch (err) {
            next(err);
        }
    }
    return handlerWrap;
}