fix: namespaced wildcard exports should not be flagged as duplicate identifiers

[whatfontisthis]

Summary

Fixes #3220.

When a module uses export * as NS from '...', its internal names are bound under the NS namespace (i.e. NS.A, NS.B), not re-exported into the flat namespace of the current module. However, the ExportMap builder was unconditionally adding the dependency to exportMap.dependencies even for namespaced wildcard re-exports. Since dependencies is iterated as flat star-exports in ExportMap.forEach, this caused the export rule to see the internal names (e.g. A, B) as if they were directly re-exported — leading to false-positive "duplicate identifier" errors.

Example that was incorrectly reported as an error:

// AB.ts
export type A = {};
export type B = {};

// ABFeature.ts
export type * as AB from "./AB";  // A and B are under AB.*, not flat

// foo.ts
export type A = {};

// index.ts (was incorrectly flagged: "Multiple exports of name 'A'")
export * from "./ABFeature";
export * from "./foo";

Root Cause

In /src/exportMap/visitor.js, ExportAllDeclaration always added the getter to this.exportMap.dependencies. For export * as NS from '...', this is wrong — the module is aliased as a namespace, not star-re-exported. The namespace binding is correctly handled separately by processSpecifier.

Fix

Only add to dependencies when there is no exported alias on the ExportAllDeclaration node. When astNode.exported is set, it's a namespace re-export handled by processSpecifier and should not be added to flat star-export dependencies.

Test Plan

• Added fixture files: tests/files/issue-3220-namespace-re-export/{AB.ts,ABFeature.ts,foo.ts}
• Added a valid test case in the TypeScript context of tests/src/rules/export.js that re-exports a file containing export type * as AB from "./AB" alongside another file exporting type A — previously this triggered a false positive, now it passes cleanly
• All 3013 existing tests continue to pass

🤖 Generated with Claude Code

[ljharb]

This needs to be rebased; please mark it as ready for review when it is.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.55%. Comparing base (dfe6ab8) to head (8dc8a26).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3243      +/-   ##
==========================================
- Coverage   95.81%   95.55%   -0.27%     
==========================================
  Files          83       83              
  Lines        3732     3732              
  Branches     1351     1351              
==========================================
- Hits         3576     3566      -10     
- Misses        156      166      +10     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.