fix(session-query): preserve sync error typing

packages/session-query/session-query/src/provider.ts

@@ -166,12 +166,18 @@ export class SessionProviderCoordinator {
   private _syncAll(state: ProviderState): Promise<void> {
     // Capture the direct source before awaiting: only searches that observed
     // the same live corpus may share an in-flight full synchronization.
-    const liveSessions = this._corpus().listLive()
-    const liveKey = JSON.stringify(liveSessions.map(session => this._snapshotLive(session)).map(snapshot => [
-      snapshot.session.header.id,
-      snapshot.fingerprint,
-      snapshot.session.persisted,
-    ]))
+    let liveSessions: Session[]
+    let liveKey: string
+    try {
+      liveSessions = this._corpus().listLive()
+      liveKey = JSON.stringify(liveSessions.map(session => this._snapshotLive(session)).map(snapshot => [
+        snapshot.session.header.id,
+        snapshot.fingerprint,
+        snapshot.session.persisted,
+      ]))
+    } catch (error: unknown) {
+      return Promise.reject(this._synchronizationError(state, error))
+    }
     if (state.fullSync?.liveKey === liveKey) return state.fullSync.promise
     const promise = this._enqueue(state, async () => {
       /* v8 ignore next -- a provider can be disposed while queued behind an in-flight update */
@@ -242,12 +248,16 @@ export class SessionProviderCoordinator {
     const next = state.chain.then(operation, operation)
     state.chain = next.then(() => undefined, () => undefined)
     return next.catch((error: unknown) => {
-      /* v8 ignore next -- service-created typed synchronization errors pass through unchanged */
-      if (error instanceof SessionQueryError) throw error
-      throw new SessionQueryError(`session-query provider "${state.provider.id}" synchronization failed: ${errorMessage(error)}`, 'SESSION_QUERY_INDEX_FAILED', { cause: error })
+      throw this._synchronizationError(state, error)
     })
   }
 
+  private _synchronizationError(state: ProviderState, error: unknown): SessionQueryError {
+    /* v8 ignore next -- service-created typed synchronization errors pass through unchanged */
+    if (error instanceof SessionQueryError) return error
+    return new SessionQueryError(`session-query provider "${state.provider.id}" synchronization failed: ${errorMessage(error)}`, 'SESSION_QUERY_INDEX_FAILED', { cause: error })
+  }
+
   private _resolveProvider(): ProviderState {
     if (this._configuredProviderId !== undefined) {
       const state = this._providers.get(this._configuredProviderId)

packages/session-query/session-query/tests/session-query.spec.ts

@@ -673,6 +673,30 @@ describe('provider selection and synchronization', () => {
     await expect(ctx.sessionQuery.searchSessions({ query: 'x' })).resolves.toMatchObject({ providerId: provider.id })
     expect(provider.persisted.get(persisted.id)?.documents[0]?.text).toBe('retry')
   })
+
+  it('types synchronous extractor failures during full-search key construction', async () => {
+    const ctx = await liveContext()
+    const session = ctx.sessions.create(SessionId('throwing-extractor'))
+    session.append('test/note', { note: 'unreachable' })
+    const provider = new FakeProvider()
+    ctx.sessionQuery.registerSearchProvider(provider)
+    const cause = new Error('custom extractor failed')
+    ctx.sessionQuery.registerEventTextExtractor('test/note', {
+      version: 'throwing-v1',
+      extract: () => { throw cause },
+    })
+
+    let thrown: unknown
+    try {
+      await ctx.sessionQuery.searchSessions({ query: 'x' })
+    } catch (error: unknown) {
+      thrown = error
+    }
+    expect(thrown).toBeInstanceOf(SessionQueryError)
+    expect(thrown).toMatchObject({ code: 'SESSION_QUERY_INDEX_FAILED', cause })
+    expect(asError(thrown).message).toContain(`provider "${provider.id}"`)
+    expect(provider.sessionRequests).toEqual([])
+  })
 })
 
 describe('semantic text extractors', () => {