OBS-384: upgrade ESLint to v8

[toufali]

In order to support more modern ECMAScript required for the front-end refactor, we need to upgrade ESLint, which currently blocks merging of the new FE code.

Unfortunately, ESLint 9 dropped support for Node < v18.18 – we’re currently on Node v14. ESLint 8 still supports Node v14.

For additional context, see ticket: https://mozilla-hub.atlassian.net/browse/OBS-478

• Upgrade ESLint to 8
• Migrate ESLint config file to compatible format
• Upgrade ESLint related Prettier packages

[willkg]

@toufali Can you adjust the commit messages to match our conventions?: https://socorro.readthedocs.io/en/latest/dev.html#git-conventions

In this case, the issues are obs issues, so it should be something like this:

obs-384: upgrade ESLint to v8

and:

obs-384: upgrade Prettier

[willkg]

Why define a minimum rather than pinning to a specific version?

[toufali]

@willkg when it's not a critical dependency I often use a minimum in case of minor patches. But I'm happy to pin it if you prefer!

[willkg]

We update this stuff rarely, so I'm wondering whether it's better to pin it and then re-enable dependabot to update things. That way it doesn't change without us approving it.

So in this case, I think we should pin it to specific versions rather than specify a minimum.

[toufali]

@toufali Can you adjust the commit messages to match our conventions?: https://socorro.readthedocs.io/en/latest/dev.html#git-conventions

In this case, the issues are obs issues, so it should be something like this:

obs-384: upgrade ESLint to v8

and:

obs-384: upgrade Prettier

Sorry @willkg – I assumed since they get squashed anyway that it didn't really matter, but I see now that the commits are linked to the jira ticket which helps with reviews. I will fix these and try to remember for next time!

[willkg]

@toufali : We landed the PR that removes legacy ES from Socorro. Can you rebase this against main tip? Then I can review it.

[toufali]

@willkg – rebase done 👍

[willkg]

Looks good! The only change I'd like to make is for us to pin the dependencies in package.json to specific versions. Let's make that change and then we can land this.