fix: preserve type modifier for export type * re-exports

[benpsnyder]

Problem

export type * from './mod' loses the type modifier during bundling, producing incorrect .d.ts output where re-exported names appear as value exports instead of type-only exports.

For example, given:

export type * from './all'

where ./all exports const all = 42, the bundled output was:

export { all };

instead of the correct:

export { type all };

This only affected the bare export type * form — the namespace form (export type * as ns from) already worked because Babel parses it as ExportNamedDeclaration with ExportNamespaceSpecifier, which goes through the existing type-only tracking path.

Root Cause

In rewriteImportExport(), ExportAllDeclaration nodes had their exportKind unconditionally set to 'value' so Rolldown can process them as JavaScript. But unlike ExportNamedDeclaration (which has specifiers whose names get tracked in typeOnlyIds), ExportAllDeclaration has no specifiers — so there was nothing to track, and the type-only information was silently discarded.

Fix

1. Pre-scan the AST before rewriteImportExport runs, resolving source modules of export type * declarations and recording them in a typeOnlyStarSources set.
2. Track exported binding names per module during transform in moduleExportBindings.
3. In renderChunk, for any source module that was a target of export type *, add all of its exported bindings to typeOnlyIds so patchImportExport correctly restores the type modifier.

Related

• Closes export * loses type modifiers when flattening re-exports #95
• Relevant to Replace rollup with rolldown-plugin-dts for declaration bundling ng-packagr/ng-packagr#3268 (this is one of the blocking bugs for adopting rolldown-plugin-dts)
• PR fix: detect and internalize types in more cases #175 and PR fix: rewrite local declare module specifiers to output chunk paths #191 also make transform async — there will be positional merge conflicts with whichever lands second, but no semantic overlap

Test plan

• Existing type-only-export fixture now correctly outputs type all (snapshot updated)
• Existing resolve-dts fixture now correctly outputs type Foo (snapshot updated)
• rollup-plugin-dts/export-all-as-type compatibility test now correctly outputs type foo (snapshot updated)
• Full test suite passes (196 passed, 1 expected fail)