Eslint v8.1 breaks docker deployment

[manekenpix]

After merging #2386, our staging server broke. The issue is that @typescript-eslint/eslint-plugin and @typescript-eslint/parser don't support eslint v8.1 yet (here's the issue in their repo).

Since we don't use devDependencies in production, this bug should never happen, BUT a closer look to what npm does when installing dependencies in production reveals another issue.

Command: `npm install --only=production --verbose --no-package-lock --ignore-scripts`

...
#9 11.57 npm http fetch GET 200 https://registry.npmjs.org/@babel%2fpreset-react 62ms (cache miss)
#9 12.22 npm http fetch GET 200 https://registry.npmjs.org/@babel%2fpreset-typescript 640ms (cache miss)
#9 12.28 npm http fetch GET 200 https://registry.npmjs.org/@types%2fjest 62ms (cache miss)
#9 12.50 npm http fetch GET 200 https://registry.npmjs.org/@typescript-eslint%2feslint-plugin 211ms (cache miss)
#9 12.74 npm http fetch GET 200 https://registry.npmjs.org/@typescript-eslint%2fparser 217ms (cache miss)
#9 12.83 npm http fetch GET 200 https://registry.npmjs.org/eslint 74ms (cache miss)
...

It seems npm does some sort of prefetching (including devDependencies), and it's what's causing this bug.

The 2 possible solutions are:

• Revert Upgrade ESLint to 8.x #2386
• Find a different way to install dependencies that make sure that no devDependencies are installed.

[humphd]

cc @BeAmazedVariable.

Two thoughts. First, we should probably revert #2386 based on the upstream issue, which doesn't sound like support for 8.1 is coming soon. @BeAmazedVariable can you do the following in a new PR for me?

git checkout master
git pull upstream master
git checkout -b issue-2407
git revert 3d7a3336d4bf89b6174b81c0999c29f411490ffc

And then make a new PR and submit?

Second, it looks to me like npm install has changed its syntax from --only=production to --production:

With the --production flag (or when the NODE_ENV environment variable is set to production), npm will not install modules listed in devDependencies. To install all modules listed in both dependencies and devDependencies when NODE_ENV environment variable is set to production, you can use --production=false.

NOTE: The --production flag has no particular meaning when adding a dependency to a project.

I wonder if changing how we do the install to use --production would solve the prefetching of devDependencies?

[tpmai22]

@humphd I would love to jump on it !

[tpmai22]

I wonder if changing how we do the install to use --production would solve the prefetching of devDependencies?

when I install all the dependencies above I use npm install eslint@latest or npm install eslint@8.1.0. I will make another attempt on using --production and see how it go.

[humphd]

@BeAmazedVariable you don't need to do that, just use the revert I mentioned. That was for @manekenpix

[manekenpix]

@humphd

Second, it looks to me like npm install has changed its syntax from --only=production to --production:

Yesterday I tried --production (I was trying to fix the bug) and I got the same result. Can you try to make sure that it's not me?

[humphd]

I haven't had time to dig into this fully yet, but I wonder if we're hitting an npm bug, maybe https://npm.community/t/npm-install-only-prod-verbose-please-do-not-pre-fetch-devdependencies/4732? I need to see if they ever fixed this. Sounds like maybe they didn't.

[manekenpix]

Closed via #2408