[flat config] ecmaVersion: "latest"

[mdjermanovic]

ESLint version

flat-config-linter branch

What problem do you want to solve?

ref: #15185 (comment)

With this configuration, ESLint will use espree.latestEcmaVersion as ecmaVersion:

{
    languageOptions: {
        ecmaVersion: "latest"
    }
}

What do you think is the correct solution?

ESLint should maintain its own latestEcmaVersion instead of using espree.latestEcmaVersion.

languageOptions.ecmaVersion is an ESLint option, and it is used not only for parsing.

An in-range version of espree can support ecmaVersion that is not supported by currently used version of ESLint. If we use espree.latestEcmaVersion, parsing will work well, but other features that are based on ecmaVersion may not. For example, in the mentioned scenario, ESLint will not add any ES globals.

Participation

• I am willing to submit a pull request for this change.

Additional comments

No response

[btmills]

Good call. Is there any discussion we need to have here before marking as accepted and moving to Ready to Implement?

[github-actions]

Oops! It looks like we lost track of this issue. What do we want to do here? This issue will auto-close in 7 days without an update.

[mdjermanovic]

@nzakas what do you think about this?

[nzakas]

Good idea. 👍

[fasttime]

@mdjermanovic Would you like to submit a PR for this change?

[mdjermanovic]

I'm working on this now.