feat: Patch Router#handle to catch Promise Rejection

In order to catch Promise rejections inside and outside of middlewares
as well as in route logic we need to patch `Router#handle` and add
.catch() to the function. With that addition it is possible to
catch rejections and handle inside `requestErrorHandler` middleware.

backend/src/utils/patchAsyncRoutes.js

@@ -0,0 +1,65 @@
+/*
+Original work Copyright (c) 2016, Nikolay Nemshilov <[email protected]>
+Modified work Copyright (c) 2016, David Banham <[email protected]>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+
+*/
+
+/* eslint-disable @typescript-eslint/no-var-requires */
+/* eslint-env node */
+const Layer = require('express/lib/router/layer');
+const Router = require('express/lib/router');
+
+const last = (arr = []) => arr[arr.length - 1];
+const noop = Function.prototype;
+
+function copyFnProps(oldFn, newFn) {
+  Object.keys(oldFn).forEach((key) => {
+    newFn[key] = oldFn[key];
+  });
+  return newFn;
+}
+
+function wrap(fn) {
+  const newFn = function newFn(...args) {
+    const ret = fn.apply(this, args);
+    const next = (args.length === 5 ? args[2] : last(args)) || noop;
+    if (ret && ret.catch) ret.catch(err => next(err));
+    return ret;
+  };
+  Object.defineProperty(newFn, 'length', {
+    value: fn.length,
+    writable: false,
+  });
+  return copyFnProps(fn, newFn);
+}
+
+export function patchRouterParam() {
+  const originalParam = Router.prototype.constructor.param;
+  Router.prototype.constructor.param = function param(name, fn) {
+    fn = wrap(fn);
+    return originalParam.call(this, name, fn);
+  };
+}
+
+Object.defineProperty(Layer.prototype, 'handle', {
+  enumerable: true,
+  get() {
+    return this.__handle;
+  },
+  set(fn) {
+    fn = wrap(fn);
+    this.__handle = fn;
+  },
+});