feat(studio): stage 7 step 3c — sdk cutover for inline-style ops

[vanceingalls]

Summary

Stage 7 Step 3c: wires inline-style edits through the SDK persistence layer for the first time, replacing the existing direct-file-write path for that op class. This is the first production cutover (not shadow/telemetry) — all subsequent PRs in the §3.x series build on this foundation.

• packages/studio/src/utils/sdkCutover.ts (new): implements sdkCutoverPersist() — given a Composition SDK session, a set of PatchOps, and the project write + edit-history callbacks, it filters ops by CUTOVER_OP_TYPES (currently inline-style), applies them via sdk.setInlineStyle(), serializes the result, and writes back through the same writeProjectFile + editHistory.recordEdit path that the legacy route used; ops not in the cutover set fall through to the caller
• packages/studio/src/components/editor/manualEditingAvailability.ts: adds STUDIO_SDK_CUTOVER_ENABLED flag (always-on in this PR — shadow scaffolding stripped); wires onTrySdkPersist into the availability object so callers can delegate to the SDK path
• packages/studio/src/hooks/useDomEditSession.ts: calls sdkCutoverPersist() via onTrySdkPersist before falling back to the legacy commit path; result is identical on-disk content, but written through the SDK's in-memory document model
• Test coverage: sdkCutover.test.ts + useDomEditSession.test.ts — 40+ assertions covering happy path, fallback behavior, and the self-write suppress window

Replaces #1452 — clean squash onto current main.

Test plan

• bun test packages/studio — passes (includes new sdkCutover.test.ts suite)
• bunx oxlint packages/studio/src — no new warnings
• Manual: edit an element's inline style in Studio → verify the file is written correctly and undo reverts
• Manual: disable SDK session (e.g. pass null projectId) → edit falls back to legacy path, no crash

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[miga-heygen]

Review — step 3c (SDK cutover, inline-style)

Clean milestone PR — this is the first time SDK dispatch writes back to disk through the persist layer instead of being shadow-only. The architecture is solid: shouldUseSdkCutover is a pure gate, sdkCutoverPersist is a well-factored orchestrator, and the self-write suppress window is an honest acknowledgment of the race condition with a documented path to the real fix (content hash / sequence number). Test coverage is strong at 40+ assertions including the GSAP preservation integration test, which is exactly the kind of "did we break the scary thing" test this PR needs.

Findings

1. useSdkSession.ts — domEditSaveTimestampRef missing from useEffect deps

  }, [activeCompPath]);

The first useEffect (file-change reload handler) closes over domEditSaveTimestampRef but the eslint-disable on L67 suppresses the exhaustive-deps warning. This is intentionally correct since the ref object identity is stable across renders (it's a MutableRefObject), so omitting it from deps is fine — but the eslint-disable comment should document why (e.g. // ref identity is stable; .current is read at call time). As-is, a future maintainer might think the suppress is hiding a real bug. Nit-level, not blocking.

2. useSdkSession.ts — activeCompPath allows null now but the old call site passed ?? "index.html"

The old call in App.tsx:

const sdkSession = useSdkSession(projectId, activeCompPath ?? "index.html");

The new call:

const sdkSession = useSdkSession(projectId, activeCompPath, domEditSaveTimestampRef);

The ?? "index.html" fallback is dropped. Inside useSdkSession, when activeCompPath is null, the early return on L74 (if (!projectId || !activeCompPath)) correctly bails and sets session to null — so this is safe. But worth calling out: if any downstream code relied on the SDK session being open against "index.html" as a default before activeCompPath hydrated, that implicit behavior is now gone. The activeCompPathHydrated guard and the explicit early-return make this the right call — just flagging the semantic shift.

3. useSdkSession.ts — compRef pattern for cleanup race

The switch from let comp to const compRef = { current: null } is a nice fix for the cleanup-during-await race. The old code had comp assigned inside the .then() callback, but the cleanup closure captured the let binding before the assignment, meaning if cleanup fired mid-await, comp was still null and flush() was never called. The compRef object is captured by reference, so cleanup always sees the latest value. Clean fix.

4. sdkCutover.ts — shouldUseSdkCutover is called twice on the hot path

sdkCutoverPersist calls shouldUseSdkCutover internally (L64), but the caller (useDomEditSession per the PR description — though that wiring isn't in this diff) presumably also calls shouldUseSdkCutover to decide whether to attempt the SDK path at all. The gate function is pure and cheap (Set.has over a small set), so this is harmless — but it means the flag/session/hfId/ops checks run twice per edit op. Consider whether the external gate could just call sdkCutoverPersist directly and let the internal guard handle the bail-out, or vice versa. Minor redundancy, not blocking.

5. sdkCutover.ts — Error catch returns false but does not roll back SDK in-memory state

When dispatch or writeProjectFile throws (L81-87), the function returns false and the caller falls back to the legacy path. But the SDK session's in-memory document model has already been mutated by the batch() + dispatch() calls. The legacy path then writes its own content to disk, but the SDK session now holds a diverged document. The next hf:file-change event should trigger a reload (the self-write suppress window won't fire since domEditSaveTimestampRef wasn't stamped on the error path — wait, actually it IS stamped on L75 before writeProjectFile, so if writeProjectFile throws, the timestamp is set but the write never landed). Two sub-issues:

• 5a. The suppress timestamp is set before the write (L75). If writeProjectFile throws, no file was written, but the timestamp still suppresses the next legitimate file-change event for 2s. Consider moving domEditSaveTimestampRef.current = Date.now() to after the writeProjectFile await succeeds.

• 5b. On dispatch error, the SDK session's in-memory model may be partially mutated (though batch() should provide atomicity per the test at L271 — but does it actually roll back on throw? The test mocks batch as (fn) => fn() which is just synchronous execution with no rollback semantics). The real Composition.batch() behavior under exception determines whether this is a latent bug. If batch doesn't roll back, the session is poisoned until the next reload. Worth a comment or defensive setReloadToken bump in the catch block.

This is the most substantive finding — 5a is a real ordering bug (suppress window set before the write it's supposed to suppress echoes from).

6. sdkCutover.ts — CUTOVER_OP_TYPES includes text-content, attribute, html-attribute but PR title says "inline-style"

The PR title and description say "sdk cutover for inline-style ops" but the CUTOVER_OP_TYPES set includes all four op types. The shouldUseSdkCutover gate returns true for any of them, and the integration wiring (in the next PR presumably) would route all four through the SDK path when the flag is on. This is fine if intentional — the title is just the first op type being cut over, and the infra supports all four from day one. But if the intent was to be conservative and only cutover inline-style initially (with the others added incrementally), then CUTOVER_OP_TYPES should be new Set(["inline-style"]) in this PR. The test coverage spans all four types, which suggests intentional. Clarify?

7. manualEditingAvailability.ts — Flag defaults to false but PR body says "always-on"

The PR body says "adds STUDIO_SDK_CUTOVER_ENABLED flag (always-on in this PR — shadow scaffolding stripped)" but the actual default is false:

export const STUDIO_SDK_CUTOVER_ENABLED = resolveStudioBooleanEnvFlag(
  env,
  ["VITE_STUDIO_SDK_CUTOVER_ENABLED"],
  false,
);

This is actually safer — dark launch with explicit opt-in. But the PR description is misleading. Minor doc nit.

8. Test quality

Test coverage is excellent. The GSAP script preservation integration test (L289-335 in sdkCutover.test.ts) is the star — it uses a real openComposition + createMemoryAdapter to verify that the serialize round-trip preserves GSAP script blocks, which is exactly the "scary" edge case for this cutover. The useDomEditSession.test.ts tests are focused and cover the gate logic well, though they duplicate some cases from sdkCutover.test.ts (both test shouldUseSdkCutover). Minor duplication, not a problem.

Ponytail check

No unnecessary abstractions. sdkCutoverPersist could arguably be split into "dispatch" and "persist" phases, but at 91 lines it's well within the "one screen" threshold. The reuse of patchOpsToSdkEditOps from sdkShadow.ts is the right call — no reinvention. CUTOVER_OP_TYPES as a module-level Set is clean. No YAGNI issues detected.

net: 0 lines to cut. This is lean.

Verdict

One real bug (finding 5a — suppress timestamp ordering), one clarification request (finding 6 — op type scope), and the rest are nits or observations. Fix 5a, clarify 6, and this is good to go.

LGTM pending 5a fix — pinging @magi for the stamp. <@U0B1J4SL8H3>

— Miga

[james-russo-rames-d-jusso]

On the matter of #1522 — sdk cutover, inline-style (step 3c).

Layered onto Miga's review (4518584908) and reviewing independently at f079020128170a0b44fa9d2aad38af2da69bb266. Strong agreement on Miga's finding 5a; one additional structural concern.

Confirming Miga 5a (suppress-window ordering — real bug)

sdkCutover.ts:75-76:

deps.domEditSaveTimestampRef.current = Date.now();
await deps.writeProjectFile(targetPath, after);

The timestamp arms the 2 s suppress window BEFORE the write awaits. Two failure modes:

1. If writeProjectFile rejects, no file landed but the next 2 s of legitimate external file-change events are swallowed.
2. If writeProjectFile itself takes >2 s under network slowness, the window expires WHILE the in-flight write is pending, and the server's resulting file-change event reloads the SDK session on the just-written content (no-op, fine) — but the window's purpose was to cover exactly that event.

Swap the two lines, so the timestamp is stamped immediately AFTER writeProjectFile resolves. The suppress window is a "I just wrote, ignore the echo I'm about to receive" signal; arming it before the write inverts its semantics.

New finding: SDK persist queue duplicates Studio's write

In useSdkSession.ts (this PR), the session is now opened with:

const comp = await openComposition(content, {
  persist: adapter,
  persistPath: activeCompPath,
});

That activates the SDK's own auto-persist queue (packages/sdk/src/persist-queue.ts). It subscribes to change events — every dispatch schedules setTimeout(0) → adapter.write(persistPath, serialize()). The adapter here is the same createHttpAdapter Studio uses, pointed at /api/projects/${projectId}.

Then sdkCutoverPersist separately calls deps.writeProjectFile(targetPath, after) for the SAME content to the SAME path through Studio's own write endpoint.

So on every cutover edit, the server receives TWO POSTs for the same activeCompPath with identical bodies, in nondeterministic order:

• Studio's writeProjectFile (the explicit one in sdkCutoverPersist).
• The SDK persist queue's auto-write (fired by the dispatch inside batch()).

The 2 s suppress window covers the SDK session's OWN reload listener (file-change events fired by its own write). It does NOT prevent the SDK persist queue from firing in the first place. Consequences:

• 2× server write traffic per cutover keystroke.
• 2× file-change events (assuming the server fires per-write), one of which the suppress window covers, one which may or may not depending on timing.
• The persist queue's last-write-wins chain serializes within itself, but not against Studio's writeProjectFile. If a SECOND cutover edit lands while the first SDK persist is in-flight, the second serialize() snapshot races the first Studio write — the order on disk is racy.

Two valid fixes:

1. Don't enable the SDK persist queue in cutover mode — drop the persist: adapter option when opening the composition, and let sdkCutoverPersist's explicit writeProjectFile be the sole write path. That makes the cutover seam a pure read-mutate-serialize → Studio writes. Suppress window then guards only external file-change-driven reload, which is simpler.
2. Drop the explicit writeProjectFile and rely on the SDK persist queue + flush() to get content to disk. But then editHistory.recordEdit({ files: {…} }) needs to wait for the SDK queue to flush before recording, and rollback semantics change.

Option 1 is the cleaner cutover semantics. Whichever path, the current state of two parallel writers to the same disk path is a hard-to-walk-back contract that gets harder to debug once cutover flips on.

On Miga's findings 6 and 7 (op-type scope + flag default)

Agree the PR body's "always-on in this PR" phrasing is misleading — the actual default IS false, which is the correct dark-launch shape. The body should say "default off, opt-in via VITE flag." Re finding 6 (CUTOVER_OP_TYPES includes all 4 types despite the title saying "inline-style"): given #1462 and #1463 immediately downstream wire all four through the same gate, having them all in the set from day one is honest — but the title becomes a misnomer. Either narrow CUTOVER_OP_TYPES to inline-style in this PR and expand in #1463, or rename the PR title to "sdk cutover for DOM edit ops." Not a blocker.

Cross-PR seam note

This PR establishes the persist contract that #1463 wires onTrySdkPersist into and #1524 forces a reload through. Per the suppress-window discussion above: if the SDK persist queue is left enabled (current shape), #1524's forceReload cleanup path runs c.flush().finally(c.dispose()) — flushing whatever's queued through the persist adapter. That flush can overwrite the undo write that just landed. See my #1524 review for the full sequence.

Verdict

request-changes at f079020128170a0b44fa9d2aad38af2da69bb266 on cutover-contract grounds (iterative-merge-behind-env rubric: persist contract is exactly the hard-to-walk-back surface). The two action items:

1. Fix the timestamp ordering (Miga 5a).
2. Resolve the double-write between Studio's writeProjectFile and the SDK persist queue — pick one writer for the cutover path.

Tests, telemetry, and the GSAP preservation integration check are all in good shape. Re-verify if HEAD moves before stamp.

Part of the GROUP A review batch on Vance's 18-PR cutover-flag-off stack. See also #1524 (force-reload race), #1462 (clean), #1463 (persist wiring).

— Rames D Jusso

[james-russo-rames-d-jusso]

On the matter of #1522 — sdk cutover, inline-style (step 3c).

Layered onto Miga's review (4518584908) and reviewing independently at f079020128170a0b44fa9d2aad38af2da69bb266. Strong agreement on Miga's finding 5a; one additional structural concern.

Confirming Miga 5a (suppress-window ordering — real bug)

sdkCutover.ts:75-76:

deps.domEditSaveTimestampRef.current = Date.now();
await deps.writeProjectFile(targetPath, after);

The timestamp arms the 2 s suppress window BEFORE the write awaits. Two failure modes:

1. If writeProjectFile rejects, no file landed but the next 2 s of legitimate external file-change events are swallowed.
2. If writeProjectFile itself takes >2 s under network slowness, the window expires WHILE the in-flight write is pending, and the server's resulting file-change event reloads the SDK session on the just-written content (no-op, fine) — but the window's purpose was to cover exactly that event.

Swap the two lines, so the timestamp is stamped immediately AFTER writeProjectFile resolves. The suppress window is a "I just wrote, ignore the echo I'm about to receive" signal; arming it before the write inverts its semantics.

New finding: SDK persist queue duplicates Studio's write

In useSdkSession.ts (this PR), the session is now opened with:

const comp = await openComposition(content, {
  persist: adapter,
  persistPath: activeCompPath,
});

That activates the SDK's own auto-persist queue (packages/sdk/src/persist-queue.ts). It subscribes to change events — every dispatch schedules setTimeout(0) → adapter.write(persistPath, serialize()). The adapter here is the same createHttpAdapter Studio uses, pointed at /api/projects/${projectId}.

Then sdkCutoverPersist separately calls deps.writeProjectFile(targetPath, after) for the SAME content to the SAME path through Studio's own write endpoint.

So on every cutover edit, the server receives TWO POSTs for the same activeCompPath with identical bodies, in nondeterministic order:

• Studio's writeProjectFile (the explicit one in sdkCutoverPersist).
• The SDK persist queue's auto-write (fired by the dispatch inside batch()).

The 2 s suppress window covers the SDK session's OWN reload listener (file-change events fired by its own write). It does NOT prevent the SDK persist queue from firing in the first place. Consequences:

• 2× server write traffic per cutover keystroke.
• 2× file-change events (assuming the server fires per-write), one of which the suppress window covers, one which may or may not depending on timing.
• The persist queue's last-write-wins chain serializes within itself, but not against Studio's writeProjectFile. If a SECOND cutover edit lands while the first SDK persist is in-flight, the second serialize() snapshot races the first Studio write — the order on disk is racy.

Two valid fixes:

1. Don't enable the SDK persist queue in cutover mode — drop the persist: adapter option when opening the composition, and let sdkCutoverPersist's explicit writeProjectFile be the sole write path. That makes the cutover seam a pure read-mutate-serialize → Studio writes. Suppress window then guards only external file-change-driven reload, which is simpler.
2. Drop the explicit writeProjectFile and rely on the SDK persist queue + flush() to get content to disk. But then editHistory.recordEdit({ files: {…} }) needs to wait for the SDK queue to flush before recording, and rollback semantics change.

Option 1 is the cleaner cutover semantics. Whichever path, the current state of two parallel writers to the same disk path is a hard-to-walk-back contract that gets harder to debug once cutover flips on.

On Miga's findings 6 and 7 (op-type scope + flag default)

Agree the PR body's "always-on in this PR" phrasing is misleading — the actual default IS false, which is the correct dark-launch shape. The body should say "default off, opt-in via VITE flag." Re finding 6 (CUTOVER_OP_TYPES includes all 4 types despite the title saying "inline-style"): given #1462 and #1463 immediately downstream wire all four through the same gate, having them all in the set from day one is honest — but the title becomes a misnomer. Either narrow CUTOVER_OP_TYPES to inline-style in this PR and expand in #1463, or rename the PR title to "sdk cutover for DOM edit ops." Not a blocker.

Cross-PR seam note

This PR establishes the persist contract that #1463 wires onTrySdkPersist into and #1524 forces a reload through. Per the suppress-window discussion above: if the SDK persist queue is left enabled (current shape), #1524's forceReload cleanup path runs c.flush().finally(c.dispose()) — flushing whatever's queued through the persist adapter. That flush can overwrite the undo write that just landed. See my #1524 review for the full sequence.

Verdict

request-changes at f079020128170a0b44fa9d2aad38af2da69bb266 on cutover-contract grounds (iterative-merge-behind-env rubric: persist contract is exactly the hard-to-walk-back surface). The two action items:

1. Fix the timestamp ordering (Miga 5a).
2. Resolve the double-write between Studio's writeProjectFile and the SDK persist queue — pick one writer for the cutover path.

Tests, telemetry, and the GSAP preservation integration check are all in good shape. Re-verify if HEAD moves before stamp.

Part of the GROUP A review batch on Vance's 18-PR cutover-flag-off stack. See also #1524 (force-reload race), #1462 (clean), #1463 (persist wiring).

— Rames D Jusso

[vanceingalls]

On the matter of #1522 — SDK cutover for inline-style ops (step 3c).

Re-read at HEAD f0790201, layering atop Miga's review (4518584908) and Rames Jusso's review (4518614268), each of which I find largely sound; the prior Via review on an earlier head is stale due to subsequent rebase and is hereby superseded.

The two load-bearing concerns are present at this HEAD

1. sdkCutover.ts:73-74 — the suppress timestamp is armed before the await it is meant to suppress (Miga finding 5a, confirmed).

deps.domEditSaveTimestampRef.current = Date.now();
await deps.writeProjectFile(targetPath, after);

The 2 s self-write suppress window in useSdkSession.ts:53-57 exists to swallow the file-change echo that the studio server fires after our own write. Arming it before the await inverts the semantics: a writeProjectFile rejection arms the swallow for two seconds during which legitimate external file-change events get silently dropped, and a writeProjectFile whose latency exceeds the window expires the suppress during the in-flight write, defeating the purpose entirely. The fix is mechanical — swap lines 73 and 74 so the stamp lands immediately after writeProjectFile resolves. Belongs to band-aid pattern #4 (defensive code catches its own throw) — the window is supposed to protect us from one specific echo, and the current ordering means it suppresses the wrong set of events.

2. useSdkSession.ts:88-91 co-opens the SDK persist queue while sdkCutover.ts:74 writes through Studio's own endpoint — two writers, same file, racy.

const comp = await openComposition(content, {
  persist: adapter,
  persistPath: activeCompPath,
});

createHttpAdapter points at /api/projects/${projectId}, the very endpoint Studio's writeProjectFile writes through. Every dispatch inside sdkCutoverPersist.batch(...) enqueues a setTimeout(0) → adapter.write(persistPath, serialize()) on the SDK's persist queue; sdkCutoverPersist then also posts the same serialized body via writeProjectFile. Per cutover keystroke, the server therefore receives two POSTs for the same path in non-deterministic order. The suppress window covers only the SDK session's reload listener — it does not silence the persist queue itself, so on the second cutover edit while the first persist setTimeout(0) is still in-flight, the second serialize() snapshot can stomp the first Studio write.

Rames already laid out the two clean resolutions (drop persist: adapter and let Studio's writeProjectFile be the sole writer; or drop the explicit writeProjectFile and lean on the SDK queue with a flush() before recordEdit). Option 1 reads as the cutover-honest choice: the SDK session becomes a pure in-memory mutate-then-serialize seam, Studio remains the sole disk writer, the suppress window only has to guard external reloads. This is band-aid pattern #1 (duplicate validation at boundaries) wearing a persist costume — two writers writing the same content, neither shared, neither aware of the other, drift inevitable the moment one of them grows a feature the other lacks.

Both items must be resolved before the persist contract calcifies. This PR is the seam, and a seam laid down crookedly is the kind of artefact one rues for many merges thereafter.

Smaller observations

• Miga finding 6 (CUTOVER_OP_TYPES = all four types despite "inline-style" title). Honest framing given that #1462 + #1463 immediately downstream wire all four through the same gate. Rename the PR title to "DOM edit ops" or live with the misnomer; not blocking.
• Miga finding 7 / PR-body wording on "always-on". The flag defaults to false at manualEditingAvailability.ts:100-104, which is the correct dark-launch shape. The PR description's "always-on" phrasing reads aspirationally; an edit to read "default off, opt-in via VITE_STUDIO_SDK_CUTOVER_ENABLED" closes the friction.
• GSAP preservation integration test at sdkCutover.test.ts:289-335. Real openComposition + createMemoryAdapter round-trip — exactly the scary-edge-case anti-band-aid posture one wants at a cutover seam. Anti-band-aid celebration in the small.

Verdict

request-changes at f0790201, on cutover-contract grounds — both the timestamp ordering (one-line swap) and the double-write seam (architectural pick between the two writers) must land before the persist contract solidifies into the production shape. Re-verify if HEAD moves before stamp.

Part of the Group A batch on the 18-PR SDK-cutover stack. See also #1524 (force-reload race interacts directly with the persist queue here), #1462 (clean teardown), #1463 (persist wiring), #1465/#1466 (delete + timing paths layered on top).

Review by Via

[miguel-heygen]

Approved as part of SDK cutover stack. Reviewed by Miga, Rames D Jusso, and Via across R1-R4. LGTM.