Expose labeled tuple element declarations in the TypeScript 7 API

[Copilot]

TypeScript 7 did not expose tuple element labels through TupleType, preventing API consumers from recovering foo and bar from:

function gh1449<T extends [foo: any, bar?: any]>(a: T): T;

• API

  • Adds TupleType.labeledElementDeclarations.
  • Represents declarations as project-scoped NodeHandle<NamedTupleMember | ParameterDeclaration> values.

• Protocol

  • Serializes labeled declarations only on tuple targets.
  • Preserves undefined entries for partially labeled tuples.

• Coverage

  • Exercises label retrieval and node resolution through both async and sync APIs.

• Fixes [API] labeledElementDeclarations is missing in TypeScript 7 #64105

[Copilot]

Pull request overview

Exposes tuple label declarations through the TypeScript 7 API.

Changes:

• Serializes tuple-label node handles, preserving sparse entries.
• Adds async and sync API properties and hydration.
• Tests named tuple-member resolution.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tsc/internal/api/session.go	Creates label node handles.
tsc/internal/api/proto.go	Adds protocol field.
packages/typescript/src/api/proto.generated.ts	Updates generated protocol types.
packages/typescript/src/api/sync/types.ts	Adds sync public property.
packages/typescript/src/api/sync/api.ts	Hydrates sync node handles.
packages/typescript/test/sync/api.test.ts	Tests sync label resolution.
packages/typescript/src/api/async/types.ts	Adds async public property.
packages/typescript/src/api/async/api.ts	Hydrates async node handles.
packages/typescript/test/async/api.test.ts	Tests async label resolution.

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