Wp-calypso: Build: npm start doesn't work on its own

[alisterscott]

Steps to reproduce

1. clone repository
2. optionally run npm run distclean for existing install
3. run npm start

note - workaround is to run npm install first

What I expected

calypso

What happened instead

$ npm start

> [email protected] prestart /Users/alisterscott/Projects/a8c/wp-calypso
> run-s prestart:check-version install-if-deps-outdated prestart:welcome

sh: run-s: command not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! [email protected] prestart: `run-s prestart:check-version install-if-deps-outdated prestart:welcome`
npm ERR! spawn ENOENT
npm ERR! 
npm ERR! Failed at the [email protected] prestart script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/alisterscott/.npm/_logs/2018-07-03T04_47_00_081Z-debug.log

Browser / OS version

n/a

Screenshot / Video

n/a

Context / Source

Local development

[alisterscott]

cc @Automattic/team-calypso

[alisterscott]

npm start generates changes to the shrinkwrap file on master

[jorgecasariego]

@alisterscott I had the same problem and I will show you the steps I took to reach the solution:

1. Install nvm
   curl -o-- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash

2. nvm install node

3. nvm use --delete-prefix v10.5.0

4. npm start

I can't go into detail as I'm not an expert on Node but those were the steps I did to then run calypso.localhost:3000 in my browser.

I hope this can help

[jsnajdr]

This is a regression introduced in #25764 (by @blowery). The prestart script runs install-if-deps-outdated using run-s, but run-s (part of npm-run-all) is not installed yet...

Before that patch, run-s wasn't used before the initial install.

[alisterscott]

Fix in #25934 works well for me 👍