Update: Support top-level await and regexp match indices

[nzakas]

Updates Acorn and adds tests for top-level await and regexp match indices.

Refs eslint/eslint#14632
Refs eslint/eslint#14640

[aladdin-add]

supported features in readme needs to be updated, too.
https://github.com/eslint/espree#what-ecmascript-features-do-you-support

[nzakas]

Okay, should be all set now.

[aladdin-add]

👍 LGTM!

[mdjermanovic]

I think we need the top-level await tests to have modules word in the file path. Otherwise, they'll be parsed both with sourceType: "script" and sourceType: "module"

espree/tests/lib/ecma-version.js

Line 38 in c8ca49a

const scriptOnlyTestFiles = allTestFiles.filter(filename => !filename.includes("modules"));

(that "Only" in the variable name is misleading)

I can see this test in the output, it's passing only because the current Acorn allows that:

  ecmaVersion
    Scripts
      /13/top-level-await/top-await
        √ should parse correctly when sourceType is script

We can make a modules subdir in ecma-version/13: ecma-version/13/modules/top-level-await/, the same way as it was done in ecma-version/11

[nzakas]

I updated the tests. I’d like to see if there’s a new Acorn release in the next couple days with the top-level await fix.

[nzakas]

A new release of Acorn was published, so added that.