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feat(eslint-plugin): [unified-signatures] add ignoreDifferentlyNamedParameters option #4659


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@JoshuaKGoldberg JoshuaKGoldberg commented Mar 9, 2022

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When two signatures have the same number of parameters, then two parameters having a different name means they won't be considered unifiable.

Also deduplicates a bit of code in checkOverloads.

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@JoshuaKGoldberg JoshuaKGoldberg force-pushed the unified-signatures-different-name-option branch from 04afb6a to f2781df Compare Mar 9, 2022
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codecov bot commented Mar 9, 2022

Codecov Report

Merging #4659 (d235d55) into main (c59d9d7) will decrease coverage by 0.02%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##             main    #4659      +/-   ##
- Coverage   94.28%   94.26%   -0.03%     
  Files         151      151              
  Lines        8208     8214       +6     
  Branches     2670     2672       +2     
+ Hits         7739     7743       +4     
- Misses        261      262       +1     
- Partials      208      209       +1     
Flag Coverage Δ
unittest 94.26% <88.23%> (-0.03%) ⬇️

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

Impacted Files Coverage Δ
...-plugin/src/rules/no-unnecessary-type-assertion.ts 94.66% <ø> (ø)
...ages/eslint-plugin/src/rules/unified-signatures.ts 92.10% <86.66%> (-1.14%) ⬇️
.../eslint-plugin/src/rules/method-signature-style.ts 89.15% <100.00%> (+0.26%) ⬆️

@JoshuaKGoldberg JoshuaKGoldberg marked this pull request as ready for review Mar 9, 2022
@bradzacher bradzacher added the enhancement: plugin rule option New rule option for an existing eslint-plugin rule label Mar 10, 2022
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@bradzacher bradzacher left a comment

this is looking good to me so far!
I didn't see any test cases for it - could you please add a negative test with the option false?

packages/eslint-plugin/src/rules/unified-signatures.ts Outdated Show resolved Hide resolved
@bradzacher bradzacher added the awaiting response Issues waiting for a reply from the OP or another party label Mar 18, 2022
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JoshuaKGoldberg commented Apr 8, 2022

Heh, turns out the rule already wasn't testing one of the positive test cases. Classic.

@JoshuaKGoldberg JoshuaKGoldberg requested a review from bradzacher Apr 8, 2022
@JoshuaKGoldberg JoshuaKGoldberg removed the awaiting response Issues waiting for a reply from the OP or another party label Apr 8, 2022
@bradzacher bradzacher changed the title feat(eslint-plugin): added ignoreDifferentlyNamedParameters option to unified-signatures feat(eslint-plugin): [unified-signatures] add ignoreDifferentlyNamedParameters option Apr 8, 2022
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@bradzacher bradzacher left a comment

LGTM! Thanks for adding this!

case AST_NODE_TYPES.RestElement:
return getStaticParameterName(param.argument);
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@bradzacher bradzacher Apr 8, 2022

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quick note that these is valid:

function foo({a}: {a: string}): void;
function foo([a]: [a: string]): void;

I think it's fine for us to ignore these cases as they're rare and pretty dumb.

@bradzacher bradzacher merged commit fdf95e0 into typescript-eslint:main Apr 8, 2022
17 of 18 checks passed
crapStone pushed a commit to Calciumdibromid/CaBr2 that referenced this pull request Apr 13, 2022
This PR contains the following updates:

| Package | Type | Update | Change |
| [@typescript-eslint/eslint-plugin]( | devDependencies | minor | [`5.18.0` -> `5.19.0`]( |
| [@typescript-eslint/parser]( | devDependencies | minor | [`5.18.0` -> `5.19.0`]( |


### Release Notes

<summary>typescript-eslint/typescript-eslint (@&#8203;typescript-eslint/eslint-plugin)</summary>

### [`v5.19.0`](;5190-httpsgithubcomtypescript-eslinttypescript-eslintcomparev5180v5190-2022-04-11)

[Compare Source](typescript-eslint/typescript-eslint@v5.18.0...v5.19.0)

##### Bug Fixes

-   **eslint-plugin:** update code to use estree range instead of ts pos/end [#&#8203;4723](typescript-eslint/typescript-eslint#4723) ([#&#8203;4790](typescript-eslint/typescript-eslint#4790)) ([a1e9fc4](typescript-eslint/typescript-eslint@a1e9fc4))

##### Features

-   **eslint-plugin:** \[unified-signatures] add `ignoreDifferentlyNamedParameters` option ([#&#8203;4659](typescript-eslint/typescript-eslint#4659)) ([fdf95e0](typescript-eslint/typescript-eslint@fdf95e0))
-   **eslint-plugin:** add support for valid number and bigint intersections in restrict-plus-operands rule ([#&#8203;4795](typescript-eslint/typescript-eslint#4795)) ([19c600a](typescript-eslint/typescript-eslint@19c600a))


<summary>typescript-eslint/typescript-eslint (@&#8203;typescript-eslint/parser)</summary>

### [`v5.19.0`](;5190-httpsgithubcomtypescript-eslinttypescript-eslintcomparev5180v5190-2022-04-11)

[Compare Source](typescript-eslint/typescript-eslint@v5.18.0...v5.19.0)

**Note:** Version bump only for package [@&#8203;typescript-eslint/parser](



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This PR has been generated by [Renovate Bot](

Co-authored-by: cabr2-bot <>
Reviewed-by: crapStone <>
Co-authored-by: Calciumdibromid Bot <>
Co-committed-by: Calciumdibromid Bot <>
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enhancement: plugin rule option New rule option for an existing eslint-plugin rule
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[unified-signatures] Don't trigger on mergeable declaration with different parameter name
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