Bug: Playground crashes viewing config with parserOptions not containing ecmaFeatures

[JoshuaKGoldberg]

URL(s)

https://eslint.org/play/#eyJvcHRpb25zIjp7InBhcnNlck9wdGlvbnMiOnsic291cmNlVHlwZSI6InNjcmlwdCJ9fSwidGV4dCI6Ii8qZXNsaW50IG5vLWltcGxpY2l0LWdsb2JhbHM6IFwiZXJyb3JcIiovXG5cbnZhciBmb28gPSAxO1xuXG5mdW5jdGlvbiBiYXIoKSB7fVxuIn0=

What did you do?

1. Encoded an eslint.org/play URL that contains { "parserOptions": { "sourceType": "script" } } under options
2. Visited that URL -> the page does successfully render
3. Clicked Versioning and Config in the right sidebar

What did you expect to happen?

If the user has encoded a parserOptions object that doesn't contain ecmaFeautures, the sidebar should still render properly when the config section is clicked.

What actually happened?

On section click, the page goes blank (except for the header) as a result of this crash:

playground.js:2 Uncaught TypeError: Cannot read properties of undefined (reading 'jsx')
    at playground.js:2:2175396
    at Array.filter (<anonymous>)
    at jv (playground.js:2:2175341)
    at wo (playground.js:2:131194)
    at ka (playground.js:2:142809)
    at Cl (playground.js:2:189016)
    at bu (playground.js:2:177131)
    at Eu (playground.js:2:177059)
    at yu (playground.js:2:176922)
    at ou (playground.js:2:173729)

Participation

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

Additional comments

Context: eslint/eslint#17306

[amareshsm]

Good catch 👍

[mdjermanovic]

I don't think this classifies as a bug. The playground was designed to only accept configurations that it generated itself because that was the only use case. Anyway, we can support passing partial configs if that's useful for eslint/eslint#17306.

[mdjermanovic]

URL(s)

https://eslint.org/play/#eyJvcHRpb25zIjp7InBhcnNlck9wdGlvbnMiOnsic291cmNlVHlwZSI6InNjcmlwdCJ9fSwidGV4dCI6Ii8qZXNsaW50IG5vLWltcGxpY2l0LWdsb2JhbHM6IFwiZXJyb3JcIiovXG5cbnZhciBmb28gPSAxO1xuXG5mdW5jdGlvbiBiYXIoKSB7fVxuIn0=

Click on Environments is also broken. And the Rules list is empty.