feat: add `TypeScript` parser support to playground by Tanujkanti4441 · Pull Request #714 · eslint/eslint.org

Tanujkanti4441 · 2025-03-31T09:33:35Z

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What is the purpose of this pull request?

What changes did you make? (Give an overview)

Added an option called Parser under the section Versioning and Configuration to enable @typescript-eslint/parser in playground.

Related Issues

#709

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webpack.config.js

package.json

nzakas · 2025-04-10T15:54:19Z

This is looking good! Can we make the default parser option say "Espree (default)"?

@snitin315 this is waiting for your re-review.

snitin315 · 2025-04-17T11:08:06Z

src/playground/App.js

+			...(options?.languageOptions.parser && {
+				parser: typeScriptESLintParser,
+			}),


We need to make sure to pass the languageOptions.sourceType correctly to parserOptions.sourceType in case of typeScriptESLintParser, More information here eslint/eslint#19563 (comment)

webpack.config.js

snitin315

I think we can also remove impliedStrict from ecma features in case of typescriptEslintParser. As per the docs, only jsx & globalReturn seems to be valid.

snitin315 · 2025-05-06T02:50:58Z

@Tanujkanti4441 It seems there are few merge conflicts now, can you please resolve them?

snitin315

LGTM, thanks!

Would like @nzakas to verify as well.

mdjermanovic

When @typescript-eslint/parser is selected, downloaded config file looks like this:

export default [
    {
        "languageOptions": {
            "parser": true
        }
    }
];

Which is an invalid config file. Perhaps the config file should import the parser and use it?

mdjermanovic · 2025-05-13T07:38:43Z

The value of "parser" serialized in the URL is also true. Perhaps we could use a string value ("@typescript-eslint/parser") to allow for adding more parsers in the future?

Tanujkanti4441 · 2025-05-16T17:54:11Z

The value of "parser" serialized in the URL is also true. Perhaps we could use a string value ("@typescript-eslint/parser") to allow for adding more parsers in the future?

i didn't get It may be, you mean parser: "@typescript-eslint/parser" in downloaded config file?

nzakas · 2025-05-28T14:55:50Z

Ping @mdjermanovic

mdjermanovic · 2025-05-29T09:38:39Z

The value of "parser" serialized in the URL is also true. Perhaps we could use a string value ("@typescript-eslint/parser") to allow for adding more parsers in the future?

i didn't get It may be, you mean parser: "@typescript-eslint/parser" in downloaded config file?

Sorry for the delay. I was referring to encoded config in the URL.

For example:

https://deploy-preview-714--new-eslint.netlify.app/play/#eyJ0ZXh0IjoiIiwib3B0aW9ucyI6eyJydWxlcyI6e30sImxhbmd1YWdlT3B0aW9ucyI6eyJwYXJzZXJPcHRpb25zIjp7ImVjbWFGZWF0dXJlcyI6eyJqc3giOnRydWV9LCJzb3VyY2VUeXBlIjoibW9kdWxlIn0sInBhcnNlciI6dHJ1ZX19fQ==

The part after # is Base64-encoded text and config:

{
  "text": "",
  "options": {
    "rules": {},
    "languageOptions": {
      "parserOptions": {
        "ecmaFeatures": { "jsx": true },
        "sourceType": "module"
      },
      "parser": true
    }
  }
}

"parser": true means that the "@typescript-eslint/parser" should be used. But that limits the Playground URLs to only one custom parser, and if we add more in the future, we'd need to support true for backcompat. I think it would be better to encode parser: "@typescript-eslint/parser" from the start.

Tanujkanti4441 · 2025-05-29T10:08:17Z

"parser": true means that the "@typescript-eslint/parser" should be used. But that limits the Playground URLs to only one custom parser, and if we add more in the future, we'd need to support true for backcompat. I think it would be better to encode parser: "@typescript-eslint/parser" from the start.

@mdjermanovic, i tried to fix this in 229a2e1 can you check this please and tell if it still needs an update?

mdjermanovic · 2025-05-29T10:15:14Z

"parser": true means that the "@typescript-eslint/parser" should be used. But that limits the Playground URLs to only one custom parser, and if we add more in the future, we'd need to support true for backcompat. I think it would be better to encode parser: "@typescript-eslint/parser" from the start.

@mdjermanovic, i tried to fix this in 229a2e1 can you check this please and tell if it still needs an update?

I was testing today with the deploy preview (which I believe should represent the latest version), and URLs the Playground generates still have "parser":true encoded.

lumirlumir · 2025-06-17T08:50:05Z

Ping @eslint/eslint-team

src/playground/components/Configuration.js

snitin315

Just one change.

lumirlumir

LGTM, Thanks!

Would like @mdjermanovic and @snitin315 to verify the changes before merging.

snitin315

LGTM, thanks!

feat: add typescript parser support

648d747

github-project-automation bot added this to Triage Mar 31, 2025

github-project-automation bot moved this to Needs Triage in Triage Mar 31, 2025

eslint-github-bot bot added the feature label Mar 31, 2025

snitin315 requested changes Apr 2, 2025

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Tanujkanti4441 added 2 commits April 4, 2025 17:33

apply suggestion and fix lint errors

c02859b

enablcript parser

1b47571

Tanujkanti4441 marked this pull request as ready for review April 4, 2025 14:49

snitin315 moved this from Needs Triage to Implementing in Triage Apr 8, 2025

update label of default parser to Espree (default)

e5eaa64

snitin315 reviewed Apr 17, 2025

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pass sourceType under parserOptions

274e8f8

Tanujkanti4441 mentioned this pull request Apr 29, 2025

docs: playground button for TypeScript code example eslint/eslint#19671

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snitin315 reviewed Apr 30, 2025

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snitin315 reviewed Apr 30, 2025

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Tanujkanti4441 added 2 commits April 30, 2025 14:57

remove impliedStrict for typescript parser

e8b8d86

update

944d954

Tanujkanti4441 added 2 commits May 10, 2025 17:39

Merge branch 'main' into support-typescript-play

3cc3a1b

resolve merge conflict

d2e6a0e

snitin315 previously approved these changes May 11, 2025

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mdjermanovic reviewed May 13, 2025

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lumirlumir linked an issue May 15, 2025 that may be closed by this pull request

Suggestion: Support TypeScript syntax in playground #709

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lumirlumir added the accepted label May 15, 2025

snitin315 mentioned this pull request May 20, 2025

Suggestion: support official plugins like markdown, css, json #730

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fix parser's value in downloaded config

229a2e1

Tanujkanti4441 dismissed snitin315’s stale review via 229a2e1 May 24, 2025 15:45

Tanujkanti4441 added 4 commits May 30, 2025 21:41

Merge branch 'main' into support-typescript-play

c3d6521

fix parser value in URL

a6e3f1b

fix CI

6d04060

update

580bccc

Tanujkanti4441 requested review from mdjermanovic and snitin315 June 9, 2025 09:13

snitin315 reviewed Jun 23, 2025

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snitin315 requested changes Jun 23, 2025

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fix parser value

abf548d

lumirlumir approved these changes Jun 28, 2025

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lumirlumir moved this from Implementing to Second Review Needed in Triage Jun 28, 2025

lumirlumir requested a review from snitin315 June 28, 2025 09:25

snitin315 approved these changes Jul 17, 2025

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snitin315 merged commit 449dc9c into eslint:main Jul 17, 2025
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github-project-automation bot moved this from Second Review Needed to Complete in Triage Jul 17, 2025

mdjermanovic mentioned this pull request Jan 13, 2026

Suggestion: Move languageOptions properties from nested parserOptions #891

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Tanujkanti4441 commented Mar 31, 2025

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