feat(eslint-plugin): [no-unnecessary-type-assertion] add option to ignore string const assertions #10979

KuSh · 2025-03-21T16:15:45Z

PR Checklist

Addresses an existing open issue: fixes Bug: [@typescript-eslint/no-unnecessary-type-assertion] False positives for "as const" assertions #8721
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

Add new ignoreStringConstAssertion that ignores const assertions on string literals to as it is a common use case to force typescript to not widen type to string

typescript-eslint · 2025-03-21T16:15:49Z

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codecov · 2025-03-21T16:32:11Z

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.82%. Comparing base (f30a20e) to head (fa008e4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10979      +/-   ##
==========================================
- Coverage   90.82%   90.82%   -0.01%     
==========================================
  Files         497      497              
  Lines       50204    50222      +18     
  Branches     8274     8278       +4     
==========================================
+ Hits        45600    45615      +15     
- Misses       4589     4592       +3     
  Partials       15       15

Flag	Coverage Δ
unittest	`90.82% <100.00%> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...-plugin/src/rules/no-unnecessary-type-assertion.ts	`98.08% <100.00%> (-0.90%)`	⬇️

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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JoshuaKGoldberg

A great start, thank you 🎉! Seems like a very reasonable implementation direction. I left a few comments to expand it a bit & flip the logic.

packages/eslint-plugin/docs/rules/no-unnecessary-type-assertion.mdx

packages/eslint-plugin/src/rules/no-unnecessary-type-assertion.ts

KuSh · 2025-04-01T12:26:26Z

@JoshuaKGoldberg I've taken your comments and suggestions into account.

JoshuaKGoldberg

Looking good! Just a few small things requested, no actual logic changes.

packages/eslint-plugin/src/rules/no-unnecessary-type-assertion.ts

packages/eslint-plugin/docs/rules/no-unnecessary-type-assertion.mdx

packages/eslint-plugin/src/rules/no-unnecessary-type-assertion.ts

KuSh · 2025-04-09T13:51:18Z

Looking good! Just a few small things requested, no actual logic changes.

I've taken your suggestions into account, thanks

JoshuaKGoldberg

Looks like tests are failing on some unknown option names - missed a few spots? 🙂

KuSh · 2025-04-14T16:39:30Z

Looks like tests are failing on some unknown option names - missed a few spots? 🙂

Yeah sorry about that. It should be OK now!

JoshuaKGoldberg

LGTM, and a nice reorganization of tests. Thanks! 🎉

ronami

🚀🚀 Looking great! I've added a couple of comments.

packages/eslint-plugin/src/rules/no-unnecessary-type-assertion.ts

… no-unnecessary-type-assertion rule Fixes typescript-eslint#8721

Co-authored-by: Josh Goldberg ✨ <git@joshuakgoldberg.com>

ronami

Thanks 🚀🚀

JoshuaKGoldberg

🔥

@kirkwaiblinger

| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.29.0 | 8.31.0 | | npm | @typescript-eslint/parser | 8.29.0 | 8.31.0 | ## [v8.31.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8310-2025-04-21) ##### 🚀 Features - **eslint-plugin:** \[no-unnecessary-type-assertion] add option to ignore string const assertions ([#10979](typescript-eslint/typescript-eslint#10979)) ##### ❤️ Thank You - Nicolas Le Cam You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website. ## [v8.30.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8301-2025-04-14) ##### 🩹 Fixes - **eslint-plugin:** fix mistake with eslintrc config generation ([#11072](typescript-eslint/typescript-eslint#11072)) ##### ❤️ Thank You - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website. ## [v8.30.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8300-2025-04-14) ##### 🚀 Features - **eslint-plugin:** \[no-explicit-any] suggest to replace keyof any with PropertyKey ([#11032](typescript-eslint/typescript-eslint#11032)) ##### 🩹 Fixes - **eslint-plugin:** \[promise-function-async] use a different error message for functions with promise and non-promise types ([#10950](typescript-eslint/typescript-eslint#10950)) ##### ❤️ Thank You - Dima Barabash [@dbarabashh](https://github.com/dbarabashh) - Ronen Amiel You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website. ## [v8.29.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8291-2025-04-07) ##### 🩹 Fixes - **eslint-plugin:** \[no-deprecated] report on deprecated imported variable used as property ([#10998](typescript-eslint/typescript-eslint#10998)) ##### ❤️ Thank You - Ronen Amiel You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website.

@kirkwaiblinger

| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.29.0 | 8.31.0 | | npm | @typescript-eslint/parser | 8.29.0 | 8.31.0 | ## [v8.31.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8310-2025-04-21) ##### 🚀 Features - **eslint-plugin:** \[no-unnecessary-type-assertion] add option to ignore string const assertions ([#10979](typescript-eslint/typescript-eslint#10979)) ##### ❤️ Thank You - Nicolas Le Cam You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website. ## [v8.30.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8301-2025-04-14) ##### 🩹 Fixes - **eslint-plugin:** fix mistake with eslintrc config generation ([#11072](typescript-eslint/typescript-eslint#11072)) ##### ❤️ Thank You - Kirk Waiblinger [@kirkwaiblinger](https://github.com/kirkwaiblinger) You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website. ## [v8.30.0](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8300-2025-04-14) ##### 🚀 Features - **eslint-plugin:** \[no-explicit-any] suggest to replace keyof any with PropertyKey ([#11032](typescript-eslint/typescript-eslint#11032)) ##### 🩹 Fixes - **eslint-plugin:** \[promise-function-async] use a different error message for functions with promise and non-promise types ([#10950](typescript-eslint/typescript-eslint#10950)) ##### ❤️ Thank You - Dima Barabash [@dbarabashh](https://github.com/dbarabashh) - Ronen Amiel You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website. ## [v8.29.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8291-2025-04-07) ##### 🩹 Fixes - **eslint-plugin:** \[no-deprecated] report on deprecated imported variable used as property ([#10998](typescript-eslint/typescript-eslint#10998)) ##### ❤️ Thank You - Ronen Amiel You can read about our [versioning strategy](https://main--typescript-eslint.netlify.app/users/versioning) and [releases](https://main--typescript-eslint.netlify.app/users/releases) on our website.

…nore string const assertions (typescript-eslint#10979) * feat(eslint-plugin): add option to ignore string const assertiions in no-unnecessary-type-assertion rule Fixes typescript-eslint#8721 * review: Enable const assertions on all literals by default * fix: Handle null, undefined and boolean literal expressions * Apply suggestions from code review Co-authored-by: Josh Goldberg ✨ <git@joshuakgoldberg.com> * Apply suggestions from code review typescript-eslint#2

JoshuaKGoldberg changed the title ~~feat(eslint-plugin): add option to ignore string const assertiions in no-unnecessary-type-assertion rule~~ feat(eslint-plugin): [no-unnecessary-type-assertion] add option to ignore string const assertions Mar 24, 2025

JoshuaKGoldberg requested changes Mar 24, 2025

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JoshuaKGoldberg added the awaiting response Issues waiting for a reply from the OP or another party label Mar 24, 2025

KuSh force-pushed the main branch from 095473f to 0dc5f53 Compare March 24, 2025 17:11

KuSh requested a review from JoshuaKGoldberg March 24, 2025 17:12

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KuSh force-pushed the main branch from 0dc5f53 to 4d4f4af Compare March 24, 2025 17:17

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KuSh force-pushed the main branch from 3ad1fee to 1996d71 Compare April 9, 2025 13:50

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KuSh force-pushed the main branch from 533fbdb to b2e8533 Compare April 14, 2025 16:37

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JoshuaKGoldberg added the 1 approval >=1 team member has approved this PR; we're now leaving it open for more reviews before we merge label Apr 15, 2025

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ronami added awaiting response Issues waiting for a reply from the OP or another party and removed 1 approval >=1 team member has approved this PR; we're now leaving it open for more reviews before we merge labels Apr 15, 2025

KuSh dismissed JoshuaKGoldberg’s stale review via 7a3d342 April 18, 2025 08:55

KuSh force-pushed the main branch 2 times, most recently from 0251979 to 7a3d342 Compare April 18, 2025 09:09

feat(eslint-plugin): add option to ignore string const assertiions in…

7b22e0c

… no-unnecessary-type-assertion rule Fixes typescript-eslint#8721

KuSh added 3 commits April 18, 2025 12:37

review: Enable const assertions on all literals by default

fa1849f

fix: Handle null, undefined and boolean literal expressions

1213898

Apply suggestions from code review

e377805

Co-authored-by: Josh Goldberg ✨ <git@joshuakgoldberg.com>

KuSh force-pushed the main branch from d7ea6f7 to 83641ab Compare April 18, 2025 13:19

Apply suggestions from code review typescript-eslint#2

fa008e4

KuSh force-pushed the main branch from 83641ab to fa008e4 Compare April 18, 2025 13:49

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JoshuaKGoldberg merged commit 80bd7a5 into typescript-eslint:main Apr 21, 2025
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feat(eslint-plugin): [no-unnecessary-type-assertion] add option to ignore string const assertions #10979

feat(eslint-plugin): [no-unnecessary-type-assertion] add option to ignore string const assertions #10979

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feat(eslint-plugin): [no-unnecessary-type-assertion] add option to ignore string const assertions #10979

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KuSh commented Mar 21, 2025

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