fix(eslint-plugin): [no-unnecessary-type-assertion] handle literal types #10523

mdm317 · 2024-12-19T16:00:23Z

PR Checklist

Addresses an existing open issue: fixes Bug: [no-unnecessary-type-assertion] False report with an 'as' assertion #10257
That issue was marked as accepting prs
Steps in Contributing were taken

Overview

Add case when cast type is a template literal or a union type that is string-like.

typescript-eslint · 2024-12-19T16:00:27Z

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codecov · 2024-12-19T16:33:10Z

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.91%. Comparing base (4dbf48b) to head (a6786eb).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10523   +/-   ##
=======================================
  Coverage   86.90%   86.91%           
=======================================
  Files         446      446           
  Lines       15502    15509    +7     
  Branches     4516     4519    +3     
=======================================
+ Hits        13472    13479    +7     
  Misses       1675     1675           
  Partials      355      355

Flag	Coverage Δ
unittest	`86.91% <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	`97.97% <100.00%> (+0.02%)`	⬆️

... and 2 files with indirect coverage changes

JoshuaKGoldberg

LGTM! Just requesting changes on naming and removing the noFormat. Thanks!

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

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

JoshuaKGoldberg

🪨

ronami

Looking great! Just requesting minor changes around testing 🏆

Edit: I'm not sure if it's too fringe, but I did see one regression with the readonly modifier (main branch playground link, deploy preview playground link).

ronami · 2025-01-02T18:59:40Z

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

+
+        const wouldSameTypeBeInferred =
+          castType.isLiteral() ||
+          isAssertionTypeTemplateLiteral ||


[Testing]: No tests fail if this is omitted (isAssertionTypeTemplateLiteral ||), let's simplify or add a test case?

Thanks for the review. I think it would be better to simplify logic for this issue.

ronami

Thanks 👍

ronami · 2025-01-06T06:27:26Z

This was on my mind, and I missed it when I reviewed the PR yesterday, but I did notice this one regression (playground link, deploy preview playground link):

const state: "expired" | "pending" = "pending";

function main() {
  return {
    // correctly reported previously, now doesn't report
    type: state as "expired" | "pending"
  };
}

I'll open a separate issue about it.

JoshuaKGoldberg · 2025-01-06T15:49:21Z

Ah, it's both class properties and object properties:

class Example {
  type = state as 'expired' | 'pending'
}

I'm going to go ahead and revert this before it gets into the weekly release today - I think the logic will need to be more intricate.

@y-hsgw

##### [v8.19.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8191-2025-01-06) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-type-assertion] handle literal types ([#10523](typescript-eslint/typescript-eslint#10523)) - **eslint-plugin:** \[no-deprecated] doesn't report on shorthand property in an object expression ([#10550](typescript-eslint/typescript-eslint#10550)) - **eslint-plugin:** \[strict-boolean-expressions] remove remaining (unsafe) autofixes ([#10548](typescript-eslint/typescript-eslint#10548)) - **eslint-plugin:** \[no-shadow] report correctly on parameters of functions declared with the `declare` keyword ([#10543](typescript-eslint/typescript-eslint#10543)) - **eslint-plugin:** \[no-base-to-string] check array generic type ([#10437](typescript-eslint/typescript-eslint#10437)) ##### ❤️ Thank You - Kirk Waiblinger - mdm317 - Ronen Amiel - Yukihiro Hasegawa [@y-hsgw](https://github.com/y-hsgw) 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.

@y-hsgw

| datasource | package | from | to | | ---------- | -------------------------------- | ------ | ------ | | npm | @typescript-eslint/eslint-plugin | 8.19.0 | 8.19.1 | | npm | @typescript-eslint/parser | 8.19.0 | 8.19.1 | ## [v8.19.1](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8191-2025-01-06) ##### 🩹 Fixes - **eslint-plugin:** \[no-unnecessary-type-assertion] handle literal types ([#10523](typescript-eslint/typescript-eslint#10523)) - **eslint-plugin:** \[no-deprecated] doesn't report on shorthand property in an object expression ([#10550](typescript-eslint/typescript-eslint#10550)) - **eslint-plugin:** \[strict-boolean-expressions] remove remaining (unsafe) autofixes ([#10548](typescript-eslint/typescript-eslint#10548)) - **eslint-plugin:** \[no-shadow] report correctly on parameters of functions declared with the `declare` keyword ([#10543](typescript-eslint/typescript-eslint#10543)) - **eslint-plugin:** \[no-base-to-string] check array generic type ([#10437](typescript-eslint/typescript-eslint#10437)) ##### ❤️ Thank You - Kirk Waiblinger - mdm317 - Ronen Amiel - Yukihiro Hasegawa [@y-hsgw](https://github.com/y-hsgw) 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.

fix : add case when cast type is a template literal or a union type.

9b4de1f

mdm317 marked this pull request as draft December 19, 2024 16:00

mdm317 marked this pull request as ready for review December 20, 2024 11:53

JoshuaKGoldberg requested changes Dec 30, 2024

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packages/eslint-plugin/tests/rules/no-unnecessary-type-assertion.test.ts Outdated Show resolved Hide resolved

packages/eslint-plugin/src/rules/no-unnecessary-type-assertion.ts Outdated Show resolved Hide resolved

JoshuaKGoldberg added the awaiting response Issues waiting for a reply from the OP or another party label Dec 30, 2024

mdm317 and others added 3 commits January 1, 2025 14:33

avoid using cast the word cast

0b88ee2

delete useless noFormat

e33c712

Merge branch 'main' into fix/10275-no-unnecessary-type-assertion

4c45f10

mdm317 requested a review from JoshuaKGoldberg January 2, 2025 13:46

github-actions bot removed the awaiting response Issues waiting for a reply from the OP or another party label Jan 2, 2025

JoshuaKGoldberg previously approved these changes Jan 2, 2025

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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 Jan 2, 2025

ronami requested changes Jan 2, 2025

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JoshuaKGoldberg 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 Jan 3, 2025

review: simplify logic

a6786eb

mdm317 dismissed JoshuaKGoldberg’s stale review via a6786eb January 5, 2025 07:42

mdm317 requested a review from ronami January 5, 2025 08:16

github-actions bot removed the awaiting response Issues waiting for a reply from the OP or another party label Jan 5, 2025

ronami approved these changes Jan 5, 2025

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ronami added the 1 approval >=1 team member has approved this PR; we're now leaving it open for more reviews before we merge label Jan 5, 2025

JoshuaKGoldberg merged commit 82716b8 into typescript-eslint:main Jan 6, 2025
65 checks passed

This was referenced Jan 6, 2025

fix: revert "fix(eslint-plugin): [no-unnecessary-type-assertion] handle literal types" #10620

Merged

Bug: [no-unnecessary-type-assertion] False report with an 'as' assertion #10257

Open

JoshuaKGoldberg mentioned this pull request Jan 7, 2025

fix(eslint-plugin): [no-unnecessary-type-assertion] work with enum #10591

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ronami mentioned this pull request Jan 10, 2025

feat(eslint-plugin): [no-unnecessary-type-assertion] improve reporting of literal types (POC) #10631

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fix(eslint-plugin): [no-unnecessary-type-assertion] handle literal types #10523

fix(eslint-plugin): [no-unnecessary-type-assertion] handle literal types #10523

mdm317 commented Dec 19, 2024 •

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fix(eslint-plugin): [no-unnecessary-type-assertion] handle literal types #10523

fix(eslint-plugin): [no-unnecessary-type-assertion] handle literal types #10523

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