Add ESLint

[erwanvivien]

Description

Adds ESLint to the repo (used with npm run lint)

Linting greatly improves DX and potentially the future PRs thanks to a bit more strictness

[erwanvivien]

First commit will disappear if #454 is merged

[DenizUgur]

Thanks for the PR. Couple comments though:

• I would prefer if we follow tseslint's recommendations: https://typescript-eslint.io/getting-started
• We should use the prettier plugin
• No need to test js files (or anything other than ts or json)
• We should have a single RuleConfig for TS files and one for JSON
• We need ESLint to check both entries/ and src/ folders

Also the linting doesn't seem to run on our CI (and on my local setup). Could you check that please?

[erwanvivien]

Most seems fixed @DenizUgur

We should have a single RuleConfig for TS files and one for JSON

Not sure about this one, could you please elaborate? Maybe the current state is fine?

[erwanvivien]

Also the linting doesn't seem to run on our CI

Was it fixed with the new imports from tseslint.configs.strict & tseslint.configs.stylistic

[DenizUgur]

Thank you @erwanvivien

[github-actions]

🎉 This PR is included in version 0.6.3 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

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