Quasar: `quasar serve` doesn't serve my files after running `quasar build`

[jippy89]

Describe the bug
I am trying to use quasar serve however it seems to keep sending me on 404 | Page Not Found.

Codepen/jsFiddle/Codesandbox (required)
Sorry, I tried forking a codesandbox, however I can't seem to reproduce it. I tried installing yarn global add @quasar/cli however when I try to quasar build it doesn't even recognize quasar. But I don't want to waste my time for that.. Here's the sandbox to another problem. You can check yarn.lock that I have installed @quasar/cli.

To Reproduce
Steps to reproduce the behavior:

1. Run quasar build
2. Run quasar serve
3. Go to localhost:4000
4. See 404 | Page Not Found

Expected behavior
Seeing my SPA alive as told in CLI localhost:4000

Platform (please complete the following information):
OS: Manjaro Linux Illyria 18.0.4
Node: 10.15.3
NPM: 6.9.0
Browsers: Mozilla Firefox 67.0.4 (64-bit)

Additional context
I had no idea, no errors seen. I thought I run quasar build perfectly since I can use the build files to and serve it to an express server. However after knowing that quasar can be standalone by itself, I was trying to serve it on its own and separate my REST totally from my SPA.

Logs when serving:

 Quasar CLI.......... v1.0.0-beta.3
 Listening at........ http://localhost:4000
 Web server root..... <project-directory>
 Gzip................ enabled
 Cache (max-age)..... 86400
 Micro-cache......... 1s

GET / [127.0.0.1] Wed Jul 17 2019 00:01:34 GMT+0700 (Western Indonesia Time)
  404 on /

Please do tell me if you need anymore info about my problem. Thanks!

[m0jimo]

Have you tried goto http://localhost:4000/dist/spa/index.html

[pdanpdan]

As per docs it's quasar serve path_where_the_files_are.

So in your case quasar serve dist/spa

[windroldev]

On my case I forgot to run yarn install or npm install inside the created project folder since it failed due to network failure.
If you're on Linux it might make sense to use sudo yarn install or sudo npm install.