feat: Add types by nzakas · Pull Request #18854 · eslint/eslint

nzakas · 2024-09-04T16:20:20Z

Prerequisites checklist

I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[x] Add something to the core
[ ] Other, please explain:

What changes did you make? (Give an overview)

Added the type definitions from @types/eslint to the project:

Added all type definitions in lib/types
Added tests in tests/lib/types
Added new test:types script to run type checking tests
Added npm run test:types to CI to be run on each PR
Added types entries to package.json

For simplicity, I did not enable type checking for the whole repo, just for the type tests.

This is intended to be a base for us to build off of. We can look to make improvements in future PRs.

fixes #18845

Is there anything you'd like reviewers to focus on?

The types are copied over as-is without modification (aside from including the license). We don't need to review their contents right now.

Does the testing setup make sense?

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fixes #18845

nzakas · 2024-09-05T20:30:09Z

            "**/test.js",
-            ".vscode"
+            ".vscode",
+            "**/*.ts"


Just for now. 😄

nzakas · 2024-09-05T21:52:49Z

Looks like the webpack plugin is using an older version of @types/eslint, but still seems like there may be an error in the types for formatters?

fasttime · 2024-09-05T22:14:10Z

I can confirm the Formatter type is broken, see #18821 (comment). Would patching that type help to fix the error?

nzakas · 2024-09-05T22:26:23Z

Yes, I think that's all it would take to make both integration tests pass. I'll give it a shot.

nzakas · 2024-09-06T14:51:47Z

Okay, I fixed the incorrect type and we now have three integration tests with other projects.

fasttime · 2024-09-06T19:10:35Z

+    }
+
+    interface Formatter {
+        format(results: LintResult[], data?: LintResultData): string | Promise<string>;


The second argument of LoadedFormatter#format() is just an object with an optional maxWarningsExceeded property:

eslint/docs/src/integrate/nodejs-api.md

Lines 469 to 470 in 6e79ac7

* `format` (`(results: LintResult[], resultsMeta: ResultsMeta) => string | Promise<string>`)<br>

The method to convert the [LintResult] objects to text. `resultsMeta` is an object that will contain a `maxWarningsExceeded` object if `--max-warnings` was set and the number of warnings exceeded the limit. The `maxWarningsExceeded` object will contain two properties: `maxWarnings`, the value of the `--max-warnings` option, and `foundWarnings`, the number of lint warnings.

The cwd and rulesMeta properties are passed directly to the underlying formatter function:

eslint/lib/eslint/eslint.js

Lines 1245 to 1255 in 9bde90c

return formatter(results, {

...resultsMeta,

cwd,

get rulesMeta() {

if (!rulesMeta) {

rulesMeta = eslint.getRulesMetaForResults(results);

}

return rulesMeta;

}

});

Since that type has been broken for so long and the integration tests are passing now, we can merge this change as it is, and I will try to sort up things in a follow-up PR.

fasttime · 2024-09-06T19:13:53Z

+
+sourceCode.getAllComments();
+
+sourceCode.getJSDocComment(AST); // $ExpectType Comment | null


$ExpectType annotations are not working any more. We should also fix this in a follow-up.

fasttime

LGTM, thanks! I'm going to merge this PR now so that it gets included in the ESLint v9.10.0 release.

sam3k · 2024-09-08T00:50:59Z

Per 2024-09-05 TSC meeting, this was released early and we will await feedback from users to make sure it is working as expected.

@nzakas added some integration tests for the types.

See eslint/eslint#18854

dimitropoulos · 2024-09-09T16:50:16Z

thank you for doing this!

nzakas requested a review from a team as a code owner September 4, 2024 16:20

eslint-github-bot Bot added the feature This change adds a new feature to ESLint label Sep 4, 2024

github-actions Bot added the github actions label Sep 4, 2024

feat: Add types

c9888c9

fixes #18845

nzakas force-pushed the issue18845 branch from 91080c9 to c9888c9 Compare September 4, 2024 16:21

Ignore .ts files

29df12a

nzakas added the tsc agenda This issue will be discussed by ESLint's TSC at the next meeting label Sep 5, 2024

nzakas commented Sep 5, 2024

View reviewed changes

Comment thread eslint.config.js

"**/test.js",

".vscode"

".vscode",

"**/*.ts"

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nzakas Sep 5, 2024

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Just for now. 😄

nzakas added 3 commits September 5, 2024 17:14

Add integration test for types with eslint-webpack-plugin

0001f05

Fix integration test

3ac8a73

Add neostandard integration test

5f707d1

Fix neostandard integration test

5bd2513

nzakas added 2 commits September 5, 2024 18:26

Update LintResultData

4e3b4f4

Add one more integration test

a5beaf2

nzakas mentioned this pull request Sep 6, 2024

Scheduled release for September 6th, 2024 #18819

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fasttime added the accepted There is consensus among the team that this change meets the criteria for inclusion label Sep 6, 2024

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fasttime removed the tsc agenda This issue will be discussed by ESLint's TSC at the next meeting label Sep 6, 2024

fasttime approved these changes Sep 6, 2024

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fasttime merged commit 301b90d into main Sep 6, 2024

fasttime deleted the issue18845 branch September 6, 2024 19:56

voxpelli added a commit to neostandard/neostandard that referenced this pull request Sep 9, 2024

fix(deps): types are bundled with ESLint >=9.10

53e1179

See eslint/eslint#18854

voxpelli mentioned this pull request Sep 9, 2024

fix(deps): types are bundled with ESLint >=9.10 neostandard/neostandard#164

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Change Request: Include types for @eslint/js in the package #18998

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9romise mentioned this pull request Oct 6, 2025

feat!: drop @types/eslint antfu-collective/eslint-vitest-rule-tester#19

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lumirlumir mentioned this pull request Dec 10, 2025

fix: update verify and verifyAndFix types #20384

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feat: Add types#18854

feat: Add types#18854
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issue18845

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	* `format` (`(results: LintResult[], resultsMeta: ResultsMeta) => string \| Promise<string>`)<br>
	The method to convert the [LintResult] objects to text. `resultsMeta` is an object that will contain a `maxWarningsExceeded` object if `--max-warnings` was set and the number of warnings exceeded the limit. The `maxWarningsExceeded` object will contain two properties: `maxWarnings`, the value of the `--max-warnings` option, and `foundWarnings`, the number of lint warnings.

	return formatter(results, {
	...resultsMeta,
	cwd,
	get rulesMeta() {
	if (!rulesMeta) {
	rulesMeta = eslint.getRulesMetaForResults(results);
	}

	return rulesMeta;
	}
	});


		sourceCode.getAllComments();

		sourceCode.getJSDocComment(AST); // $ExpectType Comment \| null

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