[Adarsh (jackeddisciple)]

Fixes #64920

The 7.x API had no equivalent of BuilderProgram.getAllDependencies. Rebuilding a file's dependency graph meant one getResolvedModule round trip per import, and the client also had to redo resolution modes and project reference redirects itself.

This adds program.getAllDependencies(file) to the async, sync and generator APIs. It runs on the server and reuses the same reference collection the incremental builder uses for its referenced map: imports through checker symbols, /// <reference path>, type reference directives, module augmentations, ambient modules and project reference redirects. So the result matches what tsc itself tracks. Like the old builder method, the result includes the file itself (always first here), and a file that affects the global scope gets every file in the program. Everything else comes back in program order.

I left out a separate batched getResolvedModules, since per file batching already works through api.batch and batchContext.

Tests:

• Go unit tests for GetAllDependencies: transitive imports, module augmentations, ambient modules, triple slash references, type reference directives and global scope files
• API session tests for project references with and without disableSourceOfProjectReferenceRedirect, plus the missing file error
• async and sync API tests, plus a generator parity case

Claude Code was used for code review and quality checks. I tested the changes.

[Copilot]

🟡 Changes recommended

Package-deduplication redirects can cause valid dependencies to be omitted from the returned list.

1 open issue

• Track canonical source paths for duplicate @​types installations · New

What changed in this PR

Adds program.getAllDependencies(file) to the TypeScript API, providing server-side dependency traversal without per-import round trips.

Changes:

• Reuses incremental-builder reference collection to compute transitive dependencies.
• Exposes the method through the protocol and async, sync, and generator APIs.
• Adds coverage for dependency types, project-reference redirects, global-scope files, and missing files.

File	Description
tsc/​internal/​execute/​incremental/​programtosnapshot.go	Extracts reusable reference collection with a supplied checker.
tsc/​internal/​execute/​incremental/​dependencies.go	Implements transitive dependency traversal and result ordering.
tsc/​internal/​execute/​incremental/​dependencies_test.go	Tests dependency traversal and global-scope behavior.
tsc/​internal/​api/​session.go	Dispatches and handles dependency requests.
tsc/​internal/​api/​session_dependencies_test.go	Tests project-reference redirects and missing-file errors.
tsc/​internal/​api/​proto.go	Registers the protocol method and parameters.
packages/​typescript/​test/​sync/​api.test.ts	Adds synchronous API coverage.
packages/​typescript/​test/​sync/​api-generators.test.ts	Adds generator parity coverage.
packages/​typescript/​test/​async/​api.test.ts	Adds asynchronous API coverage.
packages/​typescript/​src/​api/​sync/​api.ts	Exposes synchronous and generator methods.
packages/​typescript/​src/​api/​proto.generated.ts	Adds generated protocol and batch types.
packages/​typescript/​src/​api/​async/​api.ts	Exposes the asynchronous method.

_{Review effort: Balanced}