feat: introduce `tsdown`, support mixed js & ts in codebase by 9romise · Pull Request #2916 · vuejs/eslint-plugin-vue

9romise · 2025-08-22T01:58:37Z

Hi 👋, Vue team!

I've been trying to contribute to eslint-plugin-vue and recently noticed there might be plans to rewrite it in TypeScript, though things seem to have stalled. I’d like to help move this effort forward.

This PR introduces tsdown, a tool that can gradually transform mixed JavaScript/TypeScript codebases into pure JavaScript output. This allows us to incrementally migrate the entire project to TypeScript. I’ve already successfully rewritten several files — it works well.

Going forward, I can split the changes into multiple PRs to make review easier.

If there’s anything you’d like me to adjust in this PR, or if you have any feedback, I’d really appreciate your thoughts! 💚

Related: #2777

changeset-bot · 2025-08-22T01:58:40Z

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FloEdelmann

Really nice, thank you!

lib/processor.ts

tsdown.config.ts

2nofa11

If pull request #2931 is merged and incorporated into this PR, it may resolve some of the CI failures!!!

I believe this PR is an excellent fix 😍

package.json

docs/.vitepress/theme/components/eslint-code-block.vue

lib/plugin.js

FloEdelmann

Tested locally and it seems to work fine. Thank you for kicking off TypeScript support!

9romise · 2026-01-16T10:21:40Z

Thrilled to see this PR finally merged!
Big thanks to everyone who contributed their time to it. 💚

Error: - `npm install` fails with "Unexpected top-level property default" error - ESLint cannot parse configuration from `eslint-plugin-vue` v10.7.0 Reason: - Version `^10.6.2` allows automatic updates to `10.7.0` - `eslint-plugin-vue@10.7.0` introduced TypeScript in build process generating `export default` - This is incompatible with ESLint 8 legacy config format (`.eslintrc.js`) - Upgrading to ESLint 9 is not viable because `@vue/cli-plugin-eslint` does not support it - Project uses Vue 2 with vue-cli which requires ESLint 8 Solution: - Pin exact version `10.6.2` (remove caret) to prevent automatic updates References: - PR #1036 - vuejs/eslint-plugin-vue#2916

Error: - `npm install` fails with "Unexpected top-level property default" error - ESLint cannot parse configuration from `eslint-plugin-vue` v10.7.0 Reason: - Version `^10.6.2` allows automatic updates to `10.7.0` - `eslint-plugin-vue@10.7.0` introduced TypeScript in build process generating `export default` - This is incompatible with ESLint 8 legacy config format (`.eslintrc.js`) - Upgrading to ESLint 9 is not viable because `@vue/cli-plugin-eslint` does not support it - Project uses Vue 2 with vue-cli which requires ESLint 8 Solution: - Pin exact version `10.6.2` (remove caret) to prevent automatic updates References: - Issue #989 - vuejs/eslint-plugin-vue#2916

Error: - `npm install` fails with "Unexpected top-level property default" error - ESLint cannot parse configuration from `eslint-plugin-vue` v10.7.0 Reason: - Version `^10.6.2` allows automatic updates to `10.7.0` - `eslint-plugin-vue@10.7.0` introduced TypeScript in build process generating `export default` - This is incompatible with ESLint 8 legacy config format (`.eslintrc.js`) - Upgrading to ESLint 9 is not viable because `@vue/cli-plugin-eslint` does not support it - Project uses Vue 2 with vue-cli which requires ESLint 8 Solution: - Pin exact version `10.6.2` (remove caret) to prevent automatic updates References: - PR #907 - vuejs/eslint-plugin-vue#2916

Error: - `npm install` fails with "Unexpected top-level property default" error - ESLint cannot parse configuration from `eslint-plugin-vue` v10.7.0 Reason: - Version `^10.6.2` allows automatic updates to `10.7.0` - `eslint-plugin-vue@10.7.0` introduced TypeScript in build process generating `export default` - This is incompatible with ESLint 8 legacy config format (`.eslintrc.js`) - Upgrading to ESLint 9 is not viable because `@vue/cli-plugin-eslint` does not support it - Project uses Vue 2 with vue-cli which requires ESLint 8 Solution: - Pin exact version `10.6.2` (remove caret) to prevent automatic updates References: - PR #821 - vuejs/eslint-plugin-vue#2916

susnux · 2026-01-19T15:14:46Z

This breaks custom Vue rules - not sure if officially supported - but it was working in past.

In 10.6 and before you could create your own rules by using defineTemplateBodyVisitor from 'eslint-plugin-vue/lib/utils/index.js'.

But this is no longer available in the package.
Meaning you can no longer create your own Vue Template related rules.

Ref: vuejs/eslint-plugin-vue#2916 (comment) The utils are no longer exported, and unless this becomes a ESLint language plugin[1] we cannot really add our own Vue Template rules. [1]: vuejs/eslint-plugin-vue#2778 Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Renamed: - `vue3-recommended` config to just `recommended` (vuejs/eslint-plugin-vue#2648) - `component-tags-order` rule to `block-order` (vuejs/eslint-plugin-vue#2627) Does not work with 10.7.0 because of vuejs/eslint-plugin-vue#2916.

9romise added 5 commits August 21, 2025 17:39

feat: introduce tsdown, support js & ts

b9ad774

fix: dont bundle typescript

928fe26

chore: update

1b24273

chore: update

0f786d8

refactor: rewrite processor in ts

aedcd8d

9romise added 3 commits August 22, 2025 10:01

chore: specific tsdown target

bd930b7

fix: dont touch docs

79d440d

ci: try fix

18d7488

9romise changed the title ~~feat: introduce tsdown, support js & ts~~ feat: introduce tsdown, support mixed js & ts in codebase Aug 22, 2025

9romise marked this pull request as draft August 22, 2025 02:24

9romise added 2 commits August 22, 2025 10:40

fix: correct docs dev & build

861c1d6

chore: update

3d7f91c

9romise marked this pull request as ready for review August 22, 2025 02:47

FloEdelmann reviewed Aug 25, 2025

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chore: update

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9romise marked this pull request as draft August 25, 2025 10:57

This was referenced Sep 6, 2025

Align import integration fixture with supported ESLint versions #2930

Closed

test(integrations/import): align fixture to ESLint ^9 #2931

Merged

2nofa11 reviewed Sep 6, 2025

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package.json Outdated Show resolved Hide resolved

9romise added 8 commits October 30, 2025 14:48

build: remove specific node version

eb2d18d

chore: use import instead of require in esm files

27f3479

Merge branch 'master' into rewrite-ts

8c11d97

chore: update tsdown

17974eb

ci: add build in workflow

5e71d49

fix: don't fix extension

6c4041b

chore: update

8d33d93

Merge branch 'master' into pr/2916

f081f42

FloEdelmann requested changes Jan 15, 2026

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docs/.vitepress/theme/components/eslint-code-block.vue Show resolved Hide resolved

ota-meshi reviewed Jan 15, 2026

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lib/plugin.js Outdated Show resolved Hide resolved

9romise and others added 2 commits January 16, 2026 10:16

refactor: migrate plugin to TS

822e06f

Merge branch 'master' into rewrite-ts

c030176

FloEdelmann approved these changes Jan 16, 2026

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FloEdelmann merged commit ce20297 into vuejs:master Jan 16, 2026
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github-actions bot mentioned this pull request Jan 16, 2026

Version Packages #2988

Merged

9romise deleted the rewrite-ts branch January 16, 2026 15:15

beatrizsmerino mentioned this pull request Jan 16, 2026

hotfix(4.4.1): pin eslint-plugin-vue to exact version 10.6.2 beatrizsmerino/vue-users#1042

Merged

10 tasks

beatrizsmerino mentioned this pull request Jan 17, 2026

hotfix(3.11.1): pin eslint-plugin-vue to exact version 10.6.2 beatrizsmerino/vue-todolist#991

Merged

10 tasks

beatrizsmerino mentioned this pull request Jan 17, 2026

hotfix(3.5.1): pin eslint-plugin-vue to exact version 10.6.2 beatrizsmerino/vue-gh-pages#909

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10 tasks

beatrizsmerino mentioned this pull request Jan 17, 2026

hotfix(3.4.1): pin eslint-plugin-vue to exact version 10.6.2 beatrizsmerino/vue-editor#823

Merged

10 tasks

FloEdelmann mentioned this pull request Jan 19, 2026

Issue with 10.7.0 after upgrade from 10.6.2 #3004

Open

2 tasks

susnux mentioned this pull request Jan 19, 2026

fix: pin eslint-plugin-vue to 10.6.x nextcloud-libraries/eslint-config#1270

Closed

This was referenced Jan 19, 2026

Internal utils no longer available for custom rules #3005

Open

Rewrite it in TypeScript #2777

Open

rashfael mentioned this pull request Jan 21, 2026

Incompatible with eslint-plugin-vue v10.7.0+ - Cannot find module 'eslint-plugin-vue/lib/utils' rashfael/eslint-plugin-vue-pug#35

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feat: introduce `tsdown`, support mixed js & ts in codebase#2916

feat: introduce `tsdown`, support mixed js & ts in codebase#2916
FloEdelmann merged 43 commits intovuejs:masterfrom
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