Support `readonly` as Flow variance annotation by marcoww6 · Pull Request #19022 · prettier/prettier

marcoww6 · 2026-04-09T20:48:28Z

Description

Flow now accepts readonly as a property variance annotation equivalent to + (covariant/read-only).

Update the Variance node printer to handle kind: "readonly"
Update the Variance type definition to include "readonly" in the kind union
Update hermes-parser to 0.35.0 which supports emitting Variance nodes with kind: "readonly"
Add test fixtures covering readonly variance in object types, indexers, tuples, interfaces, and class properties

Checklist

I've added tests to confirm my change works.
N/A (If changing the API or CLI) I've documented the changes I've made (in the docs/ directory).
(If the change is user-facing) I've added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
I've read the contributing guidelines.

Flow now accepts `readonly` as a property variance annotation equivalent to `+` (covariant/read-only). Update the Variance node printer and type definition to handle `kind: "readonly"`, and update hermes-parser to 0.35.0 which supports emitting these nodes.

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fisker · 2026-04-10T10:56:31Z

Please follow the PR template.
Please also set it as draft if it's not ready for review.

marcoww6 · 2026-04-10T17:51:22Z

Please follow the PR template. Please also set it as draft if it's not ready for review.

Thanks! I've updated the PR description & checklist according to the template

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com> Co-authored-by: fisker Cheung <lionkay@gmail.com>

Summary: Commit picked in https://github.com/pieterv/prettier/commits/flow-fork. Also needed to bump a few package versions to make the test pass (see https://github.com/pieterv/prettier/commits/flow-fork/). mjs generated by `./scripts/build-prettier.sh` directly on devserver. Reviewed By: SamChou19815 Differential Revision: D100704164 fbshipit-source-id: 927cfebc54462ce6b42cf2e5087b0f88b42d6670

This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [prettier](https://prettier.io) ([source](https://github.com/prettier/prettier)) | [`3.8.4` → `3.8.5`](https://renovatebot.com/diffs/npm/prettier/3.8.4/3.8.5) | ![age](https://developer.mend.io/api/mc/badges/age/npm/prettier/3.8.5?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/prettier/3.8.4/3.8.5?slim=true) | --- ### Release Notes <details> <summary>prettier/prettier (prettier)</summary> ### [`v3.8.5`](https://github.com/prettier/prettier/releases/tag/3.8.5) [Compare Source](prettier/prettier@3.8.4...3.8.5) - Fix Flow variance annotation print ([#19022](prettier/prettier#19022) by [@marcoww6](https://github.com/marcoww6)) 🔗 [Changelog](https://github.com/prettier/prettier/blob/3.8.5/CHANGELOG.md#385) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.3caravelle.net/3Caravelle/renovate/pulls/41 Co-authored-by: Renovate Bot <renovate-bot@3caravelle.com> Co-committed-by: Renovate Bot <renovate-bot@3caravelle.com>

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…fleeting-plugin-hetzner!384) This MR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [prettier](https://prettier.io) ([source](https://github.com/prettier/prettier)) | `3.8.4` → `3.8.5` | ![age](https://developer.mend.io/api/mc/badges/age/npm/prettier/3.8.5?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/prettier/3.8.4/3.8.5?slim=true) | Note: The `pre-commit` manager in Renovate is not supported by the `pre-commit` maintainers or community. Please do not report any problems there, instead [create a Discussion in the Renovate repository](https://github.com/renovatebot/renovate/discussions/new) if you have any questions. --- ### Release Notes <details> <summary>prettier/prettier (prettier)</summary> ### [`v3.8.5`](https://github.com/prettier/prettier/blob/HEAD/CHANGELOG.md#385) [Compare Source](prettier/prettier@3.8.4...3.8.5) [diff](prettier/prettier@3.8.4...3.8.5) ##### Flow: Support `readonly` as a variance annotation ([#19022](prettier/prettier#19022) by [@marcoww6](https://github.com/marcoww6)) Flow now accepts `readonly` as a property variance annotation, equivalent to `+` (covariant/read-only).  ```jsx // Input type T = { readonly foo: string, }; // Prettier 3.8.4 SyntaxError // Prettier 3.8.5 type T = { readonly foo: string, }; ``` </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever MR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).

marcoww6 added 2 commits April 9, 2026 13:48

Update changelog with PR number

7470ef4

Apply automated changes

ab58e2d

Use messy formatting in test input to verify Prettier reformats it

40190d2

Minor refactor

5804e8e

fisker approved these changes Apr 11, 2026

View reviewed changes

Merge branch 'main' into flow-readonly-variance-v2

c759ca1

fisker merged commit 9d9d891 into prettier:main Apr 11, 2026
34 of 36 checks passed

fisker mentioned this pull request Jun 26, 2026

Backport Flow variance annotation changes to v3.8.x #19471

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claude Bot mentioned this pull request Jul 4, 2026

build(deps-dev): bump prettier from 3.8.4 to 3.8.5 ncaq/git-hooks#175

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Support `readonly` as Flow variance annotation#19022

Support `readonly` as Flow variance annotation#19022
fisker merged 6 commits into
prettier:mainfrom
marcoww6:flow-readonly-variance-v2

marcoww6 commented Apr 9, 2026 •

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fisker commented Apr 10, 2026

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marcoww6 commented Apr 10, 2026

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✅ Deploy Preview for prettier ready!

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fisker commented Apr 10, 2026

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marcoww6 commented Apr 10, 2026

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marcoww6 commented Apr 9, 2026 •

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