feat(eslint-plugin): add no-unsafe-declaration-merging #5840

yeonjuan · 2022-10-17T14:44:54Z

PR Checklist

Addresses an existing open issue: fixes New Rule: ban unsafe declaration merging #5275
That issue was marked as accepting prs
Steps in CONTRIBUTING.md were taken

Overview

typescript-eslint · 2022-10-17T14:44:56Z

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codecov · 2022-10-17T15:04:10Z

Codecov Report

Merging #5840 (944a5a4) into main (0be356b) will increase coverage by 0.00%.
The diff coverage is 92.85%.

❗ Current head 944a5a4 differs from pull request most recent head 9be6acc. Consider uploading reports for the commit 9be6acc to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5840   +/-   ##
=======================================
  Coverage   91.34%   91.35%           
=======================================
  Files         360      361    +1     
  Lines       12010    12024   +14     
  Branches     3498     3499    +1     
=======================================
+ Hits        10971    10984   +13     
  Misses        743      743           
- Partials      296      297    +1

Flag	Coverage Δ
unittest	`91.35% <92.85%> (+<0.01%)`	⬆️

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

Impacted Files	Coverage Δ
...-plugin/src/rules/no-unsafe-declaration-merging.ts	`92.85% <92.85%> (ø)`

JoshuaKGoldberg

Looks great, thanks for sending this in! Mostly requesting a bit more test coverage.

packages/eslint-plugin/docs/rules/no-unsafe-declaration-merging.md

packages/eslint-plugin/src/rules/no-unsafe-declaration-merging.ts

packages/eslint-plugin/tests/rules/no-unsafe-declaration-merging.test.ts

packages/eslint-plugin/src/rules/no-unsafe-declaration-merging.ts

packages/eslint-plugin/tests/rules/no-unsafe-declaration-merging.test.ts

yeonjuan · 2022-10-18T12:13:34Z

@JoshuaKGoldberg Thanks for the reviews. I fixed it.

And, I changed the reported node with the Identifier node, because reporting the whole class or interface declaration can overlap other errors inside the declaration body.

// from
context.report({
         node: node.parent, // class or interface declaration node
         messageId: 'unsafeMerging',
 });
 // to
 context.report({
          node: node, // identifier node
          messageId: 'unsafeMerging',
});

JoshuaKGoldberg

Fantastic, thanks for sending this in @yeonjuan! 🙌

packages/eslint-plugin/docs/rules/no-unsafe-declaration-merging.md

bradzacher · 2022-10-19T11:41:43Z

packages/eslint-plugin/docs/rules/no-unsafe-declaration-merging.md

+TypeScript's "declaration merging" supports merging separate declarations with the same name.
+
+Declaration merging between classes and interfaces is unsafe.
+The TypeScript compiler doesn't check whether properties are initialized, which can cause lead to TypeScript not detecting code that will cause runtime errors.


oops typo!

Suggested change

The TypeScript compiler doesn't check whether properties are initialized, which can cause lead to TypeScript not detecting code that will cause runtime errors.

The TypeScript compiler doesn't check whether properties are initialized, which can lead to TypeScript not detecting code that will cause runtime errors.

bradzacher · 2022-10-19T11:46:13Z

packages/eslint-plugin/src/rules/no-unsafe-declaration-merging.ts

+    docs: {
+      description: 'Disallow unsafe declaration merging',
+      recommended: 'strict',
+      requiresTypeChecking: true,


We should actually be able to do this without type info and just with the scope analysis APIs.

playground

You can see that if the names clash, then we can iterate through the variable.defs array and do a similar comparison as you've done here - variable.defs.some(def => def.node.type === unsafeType) where
unsafeType == AST_NODE_TYPES.TSInterfaceDeclaration | AST_NODE_TYPES.ClassDeclaration

Ah, I should finally get familiar with the scope manager 😄. #5854

@yeonjuan do you have time to tackle this soon? I can if not, no worries 😄

Hi @bradzacher, @JoshuaKGoldberg I can fix this soon. I'll make a PR for it. (including fixing typo)
Thanks!

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint) | devDependencies | minor | [`5.40.1` -> `5.41.0`](https://renovatebot.com/diffs/npm/@typescript-eslint%2feslint-plugin/5.40.1/5.41.0) | | [@typescript-eslint/parser](https://github.com/typescript-eslint/typescript-eslint) | devDependencies | minor | [`5.40.1` -> `5.41.0`](https://renovatebot.com/diffs/npm/@typescript-eslint%2fparser/5.40.1/5.41.0) | --- ### Release Notes <details> <summary>typescript-eslint/typescript-eslint (@typescript-eslint/eslint-plugin)</summary> ### [`v5.41.0`](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#5410-httpsgithubcomtypescript-eslinttypescript-eslintcomparev5401v5410-2022-10-24) [Compare Source](typescript-eslint/typescript-eslint@v5.40.1...v5.41.0) ##### Bug Fixes - **eslint-plugin:** \[no-base-to-string] ignore Error, URL, and URLSearchParams by default ([#5839](typescript-eslint/typescript-eslint#5839)) ([96e1c6c](typescript-eslint/typescript-eslint@96e1c6c)) - **type-utils:** prevent stack overflow in `isTypeReadonly` ([#5860](typescript-eslint/typescript-eslint#5860)) ([a6d8f7e](typescript-eslint/typescript-eslint@a6d8f7e)), closes [#4476](typescript-eslint/typescript-eslint#4476) ##### Features - **eslint-plugin:** \[no-unsafe-declaration-merging] switch to use scope analysis instead of type information ([#5865](typescript-eslint/typescript-eslint#5865)) ([e70a10a](typescript-eslint/typescript-eslint@e70a10a)) - **eslint-plugin:** add no-unsafe-declaration-merging ([#5840](typescript-eslint/typescript-eslint#5840)) ([3728031](typescript-eslint/typescript-eslint@3728031)) #### [5.40.1](typescript-eslint/typescript-eslint@v5.40.0...v5.40.1) (2022-10-17) ##### Bug Fixes - **eslint-plugin:** Skip missing 'rest' tuple type arguments in no-misused-promises ([#5809](typescript-eslint/typescript-eslint#5809)) ([c5beaa2](typescript-eslint/typescript-eslint@c5beaa2)), closes [#5807](typescript-eslint/typescript-eslint#5807) </details> <details> <summary>typescript-eslint/typescript-eslint (@typescript-eslint/parser)</summary> ### [`v5.41.0`](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/parser/CHANGELOG.md#5410-httpsgithubcomtypescript-eslinttypescript-eslintcomparev5401v5410-2022-10-24) [Compare Source](typescript-eslint/typescript-eslint@v5.40.1...v5.41.0) **Note:** Version bump only for package [@typescript-eslint/parser](https://github.com/typescript-eslint/parser) #### [5.40.1](typescript-eslint/typescript-eslint@v5.40.0...v5.40.1) (2022-10-17) **Note:** Version bump only for package [@typescript-eslint/parser](https://github.com/typescript-eslint/parser) </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 these updates again. --- - [ ] If you want to rebase/retry this PR, click this checkbox. --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).  Co-authored-by: cabr2-bot <cabr2.help@gmail.com> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1604 Reviewed-by: Epsilon_02 <epsilon_02@noreply.codeberg.org> Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org> Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>

feat(eslint-plugin): add no-unsafe-declaration-merging

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JoshuaKGoldberg requested changes Oct 17, 2022

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yeonjuan requested a review from JoshuaKGoldberg October 18, 2022 12:22

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JoshuaKGoldberg dismissed their stale review via 231ff6f October 19, 2022 02:55

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Merge branch 'main' into fix/typescript-eslint#5275

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JoshuaKGoldberg merged commit 3728031 into typescript-eslint:main Oct 19, 2022

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Enhancement: [no-unsafe-declaration-merging] Switch to scope manager #5854

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build(deps-dev): bump @typescript-eslint/eslint-plugin from 5.36.1 to 5.41.0 numbersprotocol/capture-lite#2211

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feat(eslint-plugin): add no-unsafe-declaration-merging #5840

feat(eslint-plugin): add no-unsafe-declaration-merging #5840

yeonjuan commented Oct 17, 2022

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bradzacher Oct 19, 2022

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JoshuaKGoldberg Oct 20, 2022

JoshuaKGoldberg Oct 20, 2022

yeonjuan Oct 22, 2022

	The TypeScript compiler doesn't check whether properties are initialized, which can cause lead to TypeScript not detecting code that will cause runtime errors.
	The TypeScript compiler doesn't check whether properties are initialized, which can lead to TypeScript not detecting code that will cause runtime errors.

feat(eslint-plugin): add no-unsafe-declaration-merging #5840

feat(eslint-plugin): add no-unsafe-declaration-merging #5840

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yeonjuan commented Oct 17, 2022

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