Google Cloud Functions Build failed: function.js does not exist; Error ID: 7485c5b6

Question

I generated a demo express server using these steps:

• npm install -g express-generator
• express myExpressApp --view pug

Needless to say, the app runs fine on my local machine (npm start)

I then pushed the code to Cloud Source Repositories

Then deploy to Google Cloud Functions through their web app

What am I missing?

Source codes of my generated demo app:

/myExpressApp/app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // 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');
});

module.exports = app;

/myExpressApp/routes/index.js

var express = require('express');
var router = express.Router();

/* GET home page. */
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });
});

module.exports = router;

Final updates

I added the following as suggested by Abrar Hossain app.js

//...
module.exports = app;

exports.app = functions.http.onRequest(app);
module.exports = { app };

package.json

  "scripts": {
    "start": "functions-framework --target=company"
  },
  "dependencies": {
    "@google-cloud/functions-framework": "^1.7.1",

But the issue persists

Entry point is set as "app"

Answer 1

In short, during deployment, you have to specify the name of the JS function you want to use as GCP Cloud function, it is specified --entry-point flag. More information here (pls, do look at the flags sections). app in your case. If you provide the deployment script, I can point you to the exact spot

Long answer - the common misconception is that a GCP Cloud functions = Express app. It is not. Although under the hood they might use express and you might event request certain behavior via configuration. In reality, for GCP it is just a JS function, nothing more or less. No routers or anything like that. If you want to test it locally, use Functions Framework. You can get further details in my post