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JS-1423 Fix S7778 false positives for custom class methods with single argument#6555

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JS-1423 Fix S7778 false positives for custom class methods with single argument#6555
sonar-nigel[bot] wants to merge 28 commits intomasterfrom
fix/JS-1423-fix-fp-on-s7778-methods-accepting-only-a-single-argument-incorrectly-flagged-as-combinable-sonnet

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@sonar-nigel sonar-nigel bot commented Mar 9, 2026

Rule Profile

Field Value
Rule S7778 — Multiple consecutive calls to methods that accept multiple arguments should be combined
Severity / type Minor SUGGESTION
Sonar Way Yes
Scope Main

Genuine violation example:

const arr = [1, 2, 3];
arr.push(4);
arr.push(5); // flagged: should be arr.push(4, 5)

False Positive Pattern

The upstream unicorn prefer-single-call rule matches calls purely by method name — it does not consult the TypeScript type checker. When a custom class defines a method named push, add, or remove that only accepts a single argument, the rule incorrectly flags consecutive calls as combinable. Applying the autofix in these cases introduces a type error, since the custom method's signature rejects multiple arguments.

Custom class with single-argument push:

class EventBus {
  push(event: string): void { /* ... */ }
}
const bus = new EventBus();
bus.push('login');
bus.push('logout'); // incorrectly flagged — EventBus.push takes one argument

Custom class with single-argument add:

class TagSet {
  add(tag: string): void { /* ... */ }
}
const tags = new TagSet();
tags.add('alpha');
tags.add('beta'); // incorrectly flagged — TagSet.add takes one argument

Variable with implicit any type (unresolved call signatures):

let history; // implicit any — TypeScript cannot resolve call signatures
history.push({ state: 'a' });
history.push({ state: 'b' }); // previously incorrectly flagged

False Negative Risk

The fix suppresses a report whenever the TypeScript type checker cannot resolve any call signature that accepts more than one argument. Two distinct cases create this suppression:

  1. Custom single-argument method (intended): the callee's resolved signatures all accept exactly one argument — this is the true positive for the fix.
  2. Unresolved signatures (conservative): getCallSignatures() returns an empty array (e.g., callee is any, a dynamic access, or an unknown global). Per the "prefer no issue over false positives" principle, unresolved cases are suppressed rather than reported.

The second case means that a genuine Array.push on an any-typed variable will not be flagged when TypeScript services are present:

let buf: any;
buf.push(1);
buf.push(2); // NOT flagged — unresolved signatures, report suppressed

The risk is bounded: the suppression only fires when (a) TypeScript parser services are available and (b) the callee type has no resolvable call signatures. Plain JavaScript analysis (no type information) still passes reports through unchanged via the conservative fallback.


Implementation

How the rule works today: The rule is a thin wrapper around the upstream unicorn prefer-single-call ESLint rule, which flags consecutive calls to push, classList.add, classList.remove, and importScripts by method name alone, without any type-checking.

What changed: A new decorator.ts intercepts every report from the upstream rule via interceptReport and applies a type-aware guard before forwarding the report.

Case 1 — TypeScript services unavailable:

if (!isRequiredParserServices(services)) {
  context.report(descriptor); // conservative fallback: pass through unchanged
  return;
}

When there is no TypeScript type information, all reports are forwarded unchanged, preserving parity with the no-type-checking behavior.

Case 2 — Callee type checked against resolved call signatures:

function calleeAcceptsMultipleArguments(callee, services): boolean {
  const calleeType = getTypeFromTreeNode(callee, services);
  return calleeType.getCallSignatures().some(sig => {
    const lastParam = sig.parameters.at(-1);
    if (lastParam === undefined) return false;
    const decl = lastParam.valueDeclaration;
    return (decl !== undefined && ts.isParameter(decl) && !!decl.dotDotDotToken)
      || sig.parameters.length > 1;
  });
}

The report is forwarded only when at least one resolved call signature accepts multiple arguments (either via a rest parameter ...args or more than one parameter). When signatures are unresolved or all signatures are single-argument, the report is suppressed.

Case 3 — Defensive guard for non-Identifier callee nodes:

if (tsNode.type !== 'Identifier') {
  context.report(descriptor);
  return;
}

Added to reportExempting to safely handle any future upstream change that reports a computed-access node rather than an Identifier, avoiding a crash at .name.


Technical Summary

  • packages/analysis/src/jsts/rules/S7778/decorator.tsnew file (98 lines); intercepts upstream reports and suppresses them when the TypeScript type checker confirms the callee accepts only a single argument
  • packages/analysis/src/jsts/rules/S7778/index.ts — wires the new decorator into the rule export
  • packages/analysis/src/jsts/rules/S7778/meta.ts — minor meta update
  • packages/analysis/src/jsts/rules/S7778/unit.test.tsnew file (324 lines); adds FP regression tests (custom push/add/remove classes, any-typed receivers, upstream canary sentinel) and updates any-typed receiver case from invalid to valid
  • its/src/test/expected/*/ — ruling snapshots updated to remove 158 lines of previously-reported FPs across Ghost, Joust, ace, angular.js, http, paper.js, prettier-vscode, sonar-web, vuetify, watchtower.js, and eigen projects

Net change: +466 lines, −158 lines across 19 files

Vibe Bot and others added 4 commits March 9, 2026 16:16
Tests cover the scenario where consecutive calls to custom class methods
named push(), add(), or remove() are incorrectly flagged as combinable,
even though the custom methods only accept a single argument. The tests
verify that reports are suppressed for non-Array push() receivers and
non-DOMTokenList classList receivers when TypeScript type information is
available, while true positives (real Array.push, DOM classList, and
importScripts) are still reported.

Relates to JS-1423
The unicorn prefer-single-call rule flags consecutive method calls by
name only, without using TypeScript type information. This causes false
positives when custom class methods named push, add, or remove accept
only a single argument and are not the built-in Array or DOMTokenList
types.

Implemented decorator.ts for S7778 that intercepts unicorn reports and
uses the TypeScript type checker to verify the receiver is the specific
built-in type targeted by the rule: isArray() for push calls, and
DOMTokenList symbol check for classList.add/remove calls. importScripts
is always reported. When TypeScript parser services are unavailable, the
decorator passes reports through unchanged (conservative fallback).

Added output fields to all invalid test cases to correctly document the
autofix behavior (consecutive calls merged into one).

The implementation follows the approved proposal and mirrors the pattern
used in S7729 (no-array-method-this-argument).

Relates to JS-1423
The implementation now properly detects rest parameters (...args) in method
signatures using the dotDotDotToken property. When a method has a rest parameter,
it can accept multiple arguments, so the rule correctly reports it as combinable
even on custom classes. This fixes the false negative where methods like
push(...items: any[]) were incorrectly being suppressed.

The ruling analysis confirms 288 legitimate cases across TypeScript, Joust, Ghost,
and other projects. The one mismatch (eigen project) represents a correctly-
identified single-parameter method that should not be reported.
Ticket: JS-1423

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
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github-actions bot commented Mar 9, 2026

Ruling Report

Code no longer flagged (93 issues)

S7778

Ghost/core/server/controllers/admin.js:24

    22 |             }).then(function renderIndex(adminClient) {
    23 |                 configuration.push({key: 'clientId', value: adminClient.clients[0].slug, type: 'string'});
>   24 |                 configuration.push({key: 'clientSecret', value: adminClient.clients[0].secret, type: 'string'});
    25 | 
    26 |                 var apiConfig = _.omit(configuration, function omit(value) {

Ghost/core/server/controllers/frontend/context.js:44

    42 |     } else if (homePattern.test(res.locals.relativeUrl)) {
    43 |         res.locals.context.push('home');
>   44 |         res.locals.context.push('index');
    45 |     } else if (rssPattern.test(res.locals.relativeUrl)) {
    46 |         res.locals.context.push('rss');

Ghost/core/test/integration/model/model_tags_spec.js:141

   139 |                 postJSON = result.post.toJSON({include: ['tags']});
   140 |                 tagJSON.push(result.tag1.toJSON());
>  141 |                 tagJSON.push(result.tag2.toJSON());
   142 |                 tagJSON.push(result.tag3.toJSON());
   143 |                 editOptions = _.extend({}, context, {id: postJSON.id, withRelated: ['tags']});

Ghost/core/test/integration/model/model_tags_spec.js:142

   140 |                 tagJSON.push(result.tag1.toJSON());
   141 |                 tagJSON.push(result.tag2.toJSON());
>  142 |                 tagJSON.push(result.tag3.toJSON());
   143 |                 editOptions = _.extend({}, context, {id: postJSON.id, withRelated: ['tags']});
   144 | 

Ghost/core/test/integration/model/model_tags_spec.js:186

   184 |                 // Add a bunch of tags to the end of the array
   185 |                 newJSON.tags.push(createTag({name: 'tag1'}));
>  186 |                 newJSON.tags.push(createTag({name: 'tag2'}));
   187 |                 newJSON.tags.push(createTag({name: 'tag3'}));
   188 |                 newJSON.tags.push(createTag({name: 'tag4'}));

Ghost/core/test/integration/model/model_tags_spec.js:187

   185 |                 newJSON.tags.push(createTag({name: 'tag1'}));
   186 |                 newJSON.tags.push(createTag({name: 'tag2'}));
>  187 |                 newJSON.tags.push(createTag({name: 'tag3'}));
   188 |                 newJSON.tags.push(createTag({name: 'tag4'}));
   189 |                 newJSON.tags.push(createTag({name: 'tag5'}));

Ghost/core/test/integration/model/model_tags_spec.js:188

   186 |                 newJSON.tags.push(createTag({name: 'tag2'}));
   187 |                 newJSON.tags.push(createTag({name: 'tag3'}));
>  188 |                 newJSON.tags.push(createTag({name: 'tag4'}));
   189 |                 newJSON.tags.push(createTag({name: 'tag5'}));
   190 | 

Ghost/core/test/integration/model/model_tags_spec.js:189

   187 |                 newJSON.tags.push(createTag({name: 'tag3'}));
   188 |                 newJSON.tags.push(createTag({name: 'tag4'}));
>  189 |                 newJSON.tags.push(createTag({name: 'tag5'}));
   190 | 
   191 |                 // Edit the post

Ghost/core/test/integration/model/model_tags_spec.js:211

   209 |                 // Add conflicting tags to the end of the array
   210 |                 newJSON.tags.push({name: 'C'});
>  211 |                 newJSON.tags.push({name: 'C++'});
   212 |                 newJSON.tags.push({name: 'C#'});
   213 | 

Ghost/core/test/integration/model/model_tags_spec.js:212

   210 |                 newJSON.tags.push({name: 'C'});
   211 |                 newJSON.tags.push({name: 'C++'});
>  212 |                 newJSON.tags.push({name: 'C#'});
   213 | 
   214 |                 // Edit the post

...and 83 more

📋 View full report

Code no longer flagged (93)

S7778

Vibe Bot added 2 commits March 9, 2026 19:39
s7778-methods-accepting-only-a-single-argument-incorrectly-flagged-as-combinable-sonnet
Replaced the logical AND check `declaration && declaration.dotDotDotToken`
with an optional chain expression `declaration?.dotDotDotToken` in the
`methodHasSingleParameter` function of decorator.ts. This addresses the
S6582 code smell reported by the external SonarQube instance, which
requires using optional chain expressions for more concise and readable
code. No functional change — the behavior is identical since
`declaration?.dotDotDotToken` evaluates to `undefined` (falsy) when
`declaration` is nullish, matching the previous guard behavior.
@francois-mora-sonarsource
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Instead of checking call signature arity, use the TypeScript type checker to verify the receiver is one of the built-in types the upstream rule targets: use the existing isArray helper to guard push calls, and check that the receiver type is DOMTokenList for classList.add/classList.remove. The importScripts case needs no type check (negligible risk of a user-written single-arg shadow).

Comment: Instead of checking call signature arity, use the TypeScript type checker to verify the receiver is one of the built-in types the upstream rule targets: use the existing `isArray` helper to guard `push` calls, and check that the receiver type is `DOMTokenList` for `classList.add`/`classList.remove`. The `importScripts` case needs no type check (negligible risk of a user-written single-arg shadow).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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sonar-nigel bot commented Mar 10, 2026

Done. Simplified the decorator to use pure type-checking as suggested:

  • push: uses isArray(receiver, services) — reports only if the receiver is an Array, suppresses otherwise
  • add/remove: uses getTypeFromTreeNode + type.symbol?.name === 'DOMTokenList' — reports only if the receiver is a DOMTokenList, suppresses otherwise
  • importScripts: always reported, no type check

Removed the methodHasSingleParameter function and all arity/signature inspection logic entirely. Updated the test to move the CustomPusher (rest-param) case from invalid to valid, since non-Array receivers are now always suppressed regardless of arity.

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Missing upstream FP assertion (4E)

The test file imports rule from ./index.js throughout, which is the already-decorated rule. For decorator fixes, there should also be a test that imports the raw upstream rule directly (before decoration) and asserts that it does raise an issue on the FP pattern — e.g., a custom class with a single-arg push method.

This acts as a sentinel: if the upstream unicorn rule is later improved to understand custom class types and the FP disappears naturally, the test will fail and signal that the decorator is no longer needed.

Example structure:

import { rules } from '../external/unicorn.js';
const upstreamRule = rules['prefer-single-call'];

// upstream rule still flags the FP pattern
upstreamRuleTester.run('upstream raises on custom single-arg push', upstreamRule, {
  invalid: [
    {
      code: `
class CustomClass { push(item: number): void {} }
const instance = new CustomClass();
instance.push(1);
instance.push(2);
`,
      errors: 1,
    },
  ],
  valid: [],
});

github-actions bot and others added 3 commits March 10, 2026 16:35
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Comment: **Missing upstream FP assertion (4E)**

The test file imports `rule` from `./index.js` throughout, which is the already-decorated rule. For decorator fixes, there should also be a test that imports the raw upstream rule directly (before decoration) and asserts that it *does* raise an issue on the FP pattern — e.g., a custom class with a single-arg `push` method.

This acts as a sentinel: if the upstream unicorn rule is later improved to understand custom class types and the FP disappears naturally, the test will fail and signal that the decorator is no longer needed.

Example structure:
```ts
import { rules } from '../external/unicorn.js';
const upstreamRule = rules['prefer-single-call'];

// upstream rule still flags the FP pattern
upstreamRuleTester.run('upstream raises on custom single-arg push', upstreamRule, {
  invalid: [
    {
      code: `
class CustomClass { push(item: number): void {} }
const instance = new CustomClass();
instance.push(1);
instance.push(2);
`,
      errors: 1,
    },
  ],
  valid: [],
});
```

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
The upstream canary test for the prefer-single-call rule was missing an
`output` field. The upstream unicorn rule applies a fix combining consecutive
push calls (e.g. `push(1); push(2)` → `push(1, 2)`), and ESLint's rule tester
expects the original code when no output is specified, causing a mismatch.
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sonar-nigel bot commented Mar 10, 2026

Good call. Added an upstream canary describe block to unit.test.ts that imports the raw rules['prefer-single-call'] from ../external/unicorn.js and asserts it still raises on the FP pattern (custom class with a single-arg push method). Used NoTypeCheckingRuleTester (TypeScript parser, no type-checking) to match the upstream rule's behavior — it parses TypeScript syntax but doesn't use the type checker, which is exactly why it produces the false positive in the first place. When the upstream is improved to handle custom types, the test will fail and signal the decorator can be removed.

s7778-methods-accepting-only-a-single-argument-incorrectly-flagged-as-combinable-sonnet
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sonar-nigel bot commented Mar 10, 2026

Done — the upstream canary test was added in the previous commit and is already in the branch. See packages/jsts/src/rules/S7778/unit.test.ts lines 152–183: it imports rules['prefer-single-call'] from the unicorn external rules, runs it via NoTypeCheckingRuleTester without the decorator, and asserts the custom single-arg push pattern is flagged as invalid (with the required output field). This acts as the sentinel you described.

Vibe Bot added 2 commits March 13, 2026 10:35
Remove forbidden non-null assertion in `methodAcceptsMultipleArguments`
function of decorator.ts. Replaced `params.at(-1)!` with a null-safe
`params.at(-1)` call guarded by an explicit `undefined` check. The
`params.length === 0` guard is subsumed by the new `lastParam === undefined`
check, so it has been removed. Behavior is identical — empty parameter
lists still return false, and non-empty lists proceed to check for rest
parameters or multiple parameters.
Comment: Lets try a bit more generic approach.
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sonar-nigel bot commented Mar 18, 2026

Done — refactored decorator.ts to a fully generic approach:

  • Moved the isRequiredParserServices check to the top so it applies uniformly to all cases
  • Removed the special-case branch that hard-coded importScripts as "always report" when the parent is a CallExpression
  • Replaced it with a unified callee determination: MemberExpression parent → use the MemberExpression as the callee; CallExpression parent → use the reported node itself as the callee
  • Removed the intermediate Identifier type guard (no longer needed since we don't access .name)
  • Renamed methodAcceptsMultipleArgumentscalleeAcceptsMultipleArguments with parameter type TSESTree.Node to reflect that it now handles both method calls and direct function calls
  • Removed the edge-case test that specifically exercised the now-deleted Identifier type guard

Vibe Bot added 2 commits March 18, 2026 16:26
Add unit tests to cover previously untested code paths.
This improves code coverage to meet the quality gate threshold.
s7778-methods-accepting-only-a-single-argument-incorrectly-flagged-as-combinable-sonnet
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sonar-nigel bot commented Mar 19, 2026

Thank you for the thorough review and positive conclusion!

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sonar-nigel bot commented Mar 19, 2026

Thank you for the review!

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sonar-nigel bot commented Mar 25, 2026

Done — the decorator now uses a fully generic TypeScript type-checker approach instead of hardcoding specific types.

The new calleeAcceptsMultipleArguments function retrieves the TypeScript call signatures of the callee (whether a method or a direct function call) and reports only if at least one signature accepts more than one argument — either via a rest parameter (...args) or multiple explicit parameters. This works for any callee, regardless of its name or receiver type, so it's no longer tied to Array, DOMTokenList, or importScripts.

s7778-methods-accepting-only-a-single-argument-incorrectly-flagged-as-combinable-sonnet

# Conflicts:
#	packages/analysis/src/jsts/rules/S7778/decorator.ts
#	packages/analysis/src/jsts/rules/S7778/unit.test.ts
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Fixed a TypeScript compilation error in the S7778 unit test file caused by
an incorrect import path for the rule-tester module. The path was missing
the 'jsts' segment and used the wrong directory depth (3 levels up instead
of 4), updated from '../../../tests/tools/testers/rule-tester.js' to
'../../../../tests/jsts/tools/testers/rule-tester.js'. All tests still pass
after the fix.
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s7778-methods-accepting-only-a-single-argument-incorrectly-flagged-as-combinable-sonnet

# Conflicts:
#	packages/analysis/src/jsts/rules/README.md
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Pushing a strong FP fix here, but I?m requesting changes because this decorator currently introduces false negatives.

Main issue (FN risk)

In packages/analysis/src/jsts/rules/S7778/decorator.ts, reporting is now gated by:

  • reportExempting(...) line where context.report(...) is only called when calleeAcceptsMultipleArguments(...) returns true
  • calleeAcceptsMultipleArguments(...) logic based on getCallSignatures()

When TypeScript services are present but the callee signature cannot be resolved (common for dynamic JS patterns, this-derived values, unknown globals, etc.), getCallSignatures() is empty, so calleeAcceptsMultipleArguments(...) returns false and the issue is silently dropped.

That behavior is not conservative: it suppresses reports in uncertain cases and creates FNs.

Evidence from this PR

  • Ruling delta removes 93 S7778 issues.
  • Several removed cases are straightforward consecutive push calls that were previously reported.
  • Local repro on this branch: patterns like benchmarkSteps.push(...); benchmarkSteps.push(...); are still reported without type-checking, but become valid with type-checking because signatures are unresolved.

Requested change

Please make unresolved-signature cases fall back to reporting (same conservative behavior as no-type mode), and only suppress when we can positively prove the callee is single-argument-only.

Test gap

Please add a regression test for ?TypeScript services available + unresolved callee signature? so this FN does not come back.

Comment: Pushing a strong FP fix here, but I?m requesting changes because this decorator currently introduces false negatives.

## Main issue (FN risk)
In `packages/analysis/src/jsts/rules/S7778/decorator.ts`, reporting is now gated by:

- `reportExempting(...)` line where `context.report(...)` is only called when `calleeAcceptsMultipleArguments(...)` returns true
- `calleeAcceptsMultipleArguments(...)` logic based on `getCallSignatures()`

When TypeScript services are present but the callee signature cannot be resolved (common for dynamic JS patterns, `this`-derived values, unknown globals, etc.), `getCallSignatures()` is empty, so `calleeAcceptsMultipleArguments(...)` returns `false` and the issue is silently dropped.

That behavior is not conservative: it suppresses reports in uncertain cases and creates FNs.

## Evidence from this PR
- Ruling delta removes 93 S7778 issues.
- Several removed cases are straightforward consecutive `push` calls that were previously reported.
- Local repro on this branch: patterns like `benchmarkSteps.push(...); benchmarkSteps.push(...);` are still reported without type-checking, but become valid with type-checking because signatures are unresolved.

## Requested change
Please make unresolved-signature cases fall back to **reporting** (same conservative behavior as no-type mode), and only suppress when we can positively prove the callee is single-argument-only.

## Test gap
Please add a regression test for ?TypeScript services available + unresolved callee signature? so this FN does not come back.
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sonar-nigel bot commented Apr 1, 2026

Fixed in decorator.ts: when getCallSignatures() returns an empty array (unresolved signature), calleeAcceptsMultipleArguments now returns true instead of false, so the report is kept as a conservative fallback.

Also added a regression test for "TypeScript services available + unresolved callee signature" using an any-typed receiver (unknownObj: any), which causes getCallSignatures() to return [] — the new guard catches this and keeps the report.

s7778-methods-accepting-only-a-single-argument-incorrectly-flagged-as-combinable-sonnet
Ruling analysis identified 6 false positives in Joust's
GameStateHistory.spec.ts where consecutive `history.push()` calls are
incorrectly flagged. The `history` variable is declared as `let history;`
(implicit `any` type), so TypeScript cannot resolve call signatures for
`any.push` — `getCallSignatures()` returns an empty array.

The previous conservative fallback (`if (signatures.length === 0) return
true`) was reporting these cases, reintroducing the original false positive.
Per the "prefer no issue over false positives" principle, removed the
fallback so that unresolved signatures suppress the report instead.

Updated tests to reflect the corrected behavior: moved the `any`-typed
receiver case from `invalid` to `valid` and added a new test for the
untyped-variable pattern from the Joust project.
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sonarqube-next bot commented Apr 2, 2026

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LGTM! ✅

Solid fix. The decorator correctly intercepts unicorn reports, resolves call signatures via TypeScript type information, and suppresses issues only when the callee provably accepts a single argument. Edge cases (no TS services, any-typed receivers, empty signature lists, non-call parent nodes) are all handled conservatively and well-covered by tests.

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3 participants