Tooling APIs expanded over IPC
Native-preview clients can now request import edits directly via getImportEditsForSymbols / getImportAdderEdits, and a new runWithTemporaryFileUpdate API lets callers apply temporary snapshot edits for one-off analysis. Both changes were wired through async/sync clients and session/proto plumbing, making the server more useful for tooling and editor integrations.
Checker correctness improved across a broad set of edge cases
Several fixes landed to reduce spurious diagnostics and missed reference tracking: markLinkedReferences now bails out in more grammar-error and intentionally-unresolved contexts, deferred checker diagnostics are always reported, and unused-reference accounting was corrected for self-referential enums and namespaces. The nullish-coalescing analyzer also got a TS2871 false-positive fix.
Emit and module-resolution issues were fixed
Declaration emit no longer crashes for exported arrow/function expressions with external names, and it now handles extensionless import() specifiers correctly under allowImportingTsExtensions + nodenext by falling back to the default resolution mode. These changes close real .d.ts generation failures and improve compatibility with modern module setups.
Hover, signature help, and formatting became more robust
Hover responses now support richer VS-specific content with symbols, icons, and colorized text. At the same time, a type-expansion recursion guard prevents hover stack overflows, signature help avoids a nil pointer on recovered parameter types, and range formatting no longer panics when selections start inside JSDoc.
Watch mode avoids unnecessary rebuilds
File change events are now checked against on-disk content before dirtying the program, so no-op watch notifications won’t trigger rebuilds. That should cut down on churn without affecting real edits.
Other misc changes
- Minor
RemoteNodeArrayperformance tweak - New helper for walking multiple ancestor predicates in one pass
- Updated baselines, fourslash coverage, and internal refactors