chore: Setup typescript for the express app

packages/backend/src/app.ts

@@ -0,0 +1,34 @@
+import createError from 'http-errors';
+import express, { Request, Response, NextFunction } from 'express';
+import logger from 'morgan';
+
+import indexRouter from './routes/index';
+
+const app = express();
+const port = process.env.PORT || '3000';
+
+app.use(logger('dev'));
+app.use(express.json());
+app.use(express.urlencoded({ extended: false }));
+
+app.use('/', indexRouter);
+
+app.listen(port, () => {
+  return console.log(`Server is listening on ${port}`)
+})
+
+// catch 404 and forward to error handler
+app.use(function(req: Request, res: Response, next: NextFunction) {
+  next(createError(404));
+});
+
+// error handler
+app.use(function(err: any, req: Request, res: Response, _next: NextFunction) {
+  // set locals, only providing error in development
+  res.locals.message = err.message;
+  res.locals.error = req.app.get('env') === 'development' ? err : {};
+
+  // render the error page
+  res.status(err.status || 500);
+  res.render('error');
+});

packages/backend/src/backend.js

@@ -1,7 +0,0 @@
-'use strict';
-
-module.exports = backend;
-
-function backend() {
-    // TODO
-}

packages/backend/src/routes/index.ts

@@ -0,0 +1,7 @@
+import { Request, Response } from 'express';
+
+const indexRouter = (_request: Request, response: Response) => {
+  return response.json({ hello: 'world!' })
+};
+
+export default indexRouter;