async-middleware/dist/index.js

Wrap an asynchronous middleware (or handler) function for Express, Connect, router, etc.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function handle(result, next) {
    if (result && typeof result.then === 'function') {
        return result.then(undefined, function (err) {
            return next(err || new Error('Promise was rejected with a falsy value'));
        });
    }
    return result;
}
function wrap(fn) {
    if (fn.length === 4) {
        return function (err, req, res, next) {
            return handle(fn(err, req, res, next), next);
        };
    }
    return function (req, res, next) {
        return handle(fn(req, res, next), next);
    };
}
exports.wrap = wrap;
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