fix(runtime): immediateRender for set tweens + array timeline normalization (#1692)

* chore(studio): remove all console.* calls from studio package

* chore(studio): address review — remove dead stubs, restore consent notice

- Delete empty if-blocks left after console removal (snapTargetCollection,
  Player asset-poll, useTimelineSyncCallbacks 5s probe, useGestureRecording
  dev guard + now-unused isDevBuild) and the stale "surface in dev" comment.
- Drop the dangling no-console pragma + dead duplicate-id branch in sourcePatcher.
- Restore the one-time telemetry consent disclosure in showNoticeOnce (kept
  behind a pragma — it is a user-facing notice, not debug noise).
- Remove the missed timelineIcons console.warn while preserving the
  `tag || "div"` null-safety fallback.
- Route caption auto-save failures (a data-loss path) through telemetry
  instead of swallowing silently.
- Restore the accidentally-clobbered css-var-fonts output.mp4 fixture.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(runtime): immediateRender for set tweens + array timeline normalization

- Set tweens now emit immediateRender:true so they render on page load
  without requiring the runtime to seek past position 0
- Runtime IIFE normalizes array timelines (window.__timelines = [tl])
  to keyed objects, and auto-adds data-start on root elements
- Drag teardown clears translate:none to prevent #1673 fly-off
- Position-only set tweens hidden from timeline diamonds (3 cache paths)
- Parser: ease-only keyframe update preserves existing properties

* fix(runtime): address review — restore perf gate, debug surface, scrub restore

- Restore the #1651 skipForInjectedVideo gate in media.ts that was dropped on
  restack — avoids ~2400 wasted per-tick seeks on video-heavy renders.
- Restore the console.debug body + docstring bullet of swallow() in
  diagnostics.ts: the __hfDebug opt-in debug surface had been gutted to an
  empty if-block.
- Rebind: after the progress-cycle set() kick, seek to state.currentTime via
  totalTime() instead of snapping to 0, so a rebind after scrub / soft-reload
  restore keeps the playhead.
- Array __timelines normalization + data-start default now resolve the root
  via a shared findRootCompositionEl() that honors data-root="true" first
  (matches resolveRootCompositionElement, which now delegates to it).
- Ease-only keyframe update leaves a primitive (non-object) keyframe value
  untouched instead of wiping it to {}; add a preservation unit test.
- Document the boundDuration<=0 progress(1) kick + restore the STATIC-case
  comment in gsapRuntimeBridge.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/core/src/parsers/gsapParser.test.ts

@@ -1792,6 +1792,19 @@ describe("keyframe mutations", () => {
     expect(kf100.properties.y).toBe(50);
   });
 
+  it("updateKeyframeInScript — ease-only update preserves existing properties", () => {
+    // Per-keyframe ease editing passes empty properties + an ease. The existing
+    // property bag must survive (don't wipe x/opacity when only the ease changes).
+    const id = getAnimId(KF_SCRIPT);
+    const updated = updateKeyframeInScript(KF_SCRIPT, id, 100, {}, "power2.inOut");
+    const kf100 = parseGsapScript(updated).animations[0].keyframes!.keyframes.find(
+      (k) => k.percentage === 100,
+    )!;
+    expect(kf100.ease).toBe("power2.inOut");
+    expect(kf100.properties.x).toBe(200);
+    expect(kf100.properties.opacity).toBe(1);
+  });
+
   // Array-form keyframes (`keyframes: [{x,y}, …]`) carry no percentages — GSAP
   // distributes them evenly. The motion-path overlay drags/adds by percentage,
   // which used to no-op on array-authored tweens (#puck-b / #shuttle).

packages/core/src/parsers/gsapParser.ts

@@ -1243,13 +1243,17 @@ function applyEaseUpdate(varsArg: AstNode, ease: string): void {
   }
 }
 
-function applyUpdatesToCall(call: TweenCallInfo, updates: Partial<GsapAnimation>): void {
+function applyUpdatesToCall(
+  call: TweenCallInfo,
+  updates: Partial<GsapAnimation> & { easeEach?: string },
+): void {
   if (updates.properties) reconcileEditableProperties(call.varsArg, updates.properties);
   if (updates.fromProperties && call.method === "fromTo" && call.fromArg) {
     reconcileEditableProperties(call.fromArg, updates.fromProperties);
   }
   if (updates.duration !== undefined) setVarsKey(call.varsArg, "duration", updates.duration);
-  if (updates.ease !== undefined) applyEaseUpdate(call.varsArg, updates.ease);
+  if (updates.easeEach !== undefined) applyEaseUpdate(call.varsArg, updates.easeEach);
+  else if (updates.ease !== undefined) applyEaseUpdate(call.varsArg, updates.ease);
   if (updates.position !== undefined) {
     const posIdx = call.method === "fromTo" ? 3 : 2;
     call.node.arguments[posIdx] = parseExpr(valueToCode(updates.position));
@@ -1282,10 +1286,13 @@ function insertAfterAnchor(parsed: ParsedGsapAst, newStatement: AstNode): void {
 function buildTweenStatementCode(timelineVar: string, anim: Omit<GsapAnimation, "id">): string {
   const selector = JSON.stringify(anim.targetSelector);
   const props: Record<string, number | string> = { ...anim.properties };
-  // `set` is instantaneous — GSAP ignores duration on it, so don't emit one.
   if (anim.method !== "set" && anim.duration !== undefined) props.duration = anim.duration;
   if (anim.ease) props.ease = anim.ease;
   const entries = Object.entries(props).map(([k, v]) => `${safeKey(k)}: ${valueToCode(v)}`);
+  // immediateRender forces GSAP to apply the set when added to the timeline,
+  // not on the first seek — without it, tl.set at position 0 on a paused
+  // timeline is invisible until the playhead moves past 0.
+  if (anim.method === "set") entries.push("immediateRender: true");
   if (anim.extras) {
     for (const [k, v] of Object.entries(anim.extras)) {
       entries.push(`${safeKey(k)}: ${valueToCode(v as number | string)}`);
@@ -1308,7 +1315,7 @@ function buildTweenStatementCode(timelineVar: string, anim: Omit<GsapAnimation,
 export function updateAnimationInScript(
   script: string,
   animationId: string,
-  updates: Partial<GsapAnimation>,
+  updates: Partial<GsapAnimation> & { easeEach?: string },
 ): string {
   let parsed: ParsedGsapAst;
   try {
@@ -1437,6 +1444,7 @@ export function addAnimationWithKeyframesToScript(
     auto?: boolean;
   }>,
   ease?: string,
+  easeEach?: string,
 ): { script: string; id: string } {
   let parsed: ParsedGsapAst;
   try {
@@ -1450,7 +1458,7 @@ export function addAnimationWithKeyframesToScript(
   }
 
   const selector = JSON.stringify(targetSelector);
-  const kfCode = buildKeyframeObjectCode(keyframes);
+  const kfCode = buildKeyframeObjectCode(keyframes, easeEach ? { easeEach } : undefined);
   const varEntries = [`keyframes: ${kfCode}`, `duration: ${valueToCode(duration)}`];
   if (ease) varEntries.push(`ease: ${JSON.stringify(ease)}`);
   const posCode = valueToCode(position);
@@ -2216,6 +2224,27 @@ export function updateKeyframeInScript(
   const match = findKeyframePropByPct(kfNode, percentage);
   if (!match) return script;
 
+  if (Object.keys(properties).length === 0 && ease) {
+    // Ease-only update: preserve existing properties, just add/replace ease
+    const existing = match.prop.value;
+    if (existing?.type === "ObjectExpression") {
+      const props = (existing.properties ?? []) as AstNode[];
+      const easeIdx = props.findIndex(
+        (p: AstNode) => isObjectProperty(p) && propKeyName(p) === "ease",
+      );
+      const easeNode = parseExpr(`({ ease: ${JSON.stringify(ease)} })`).properties[0];
+      if (easeIdx >= 0) {
+        props[easeIdx] = easeNode;
+      } else {
+        props.push(easeNode);
+      }
+      return recast.print(loc.parsed.ast).code;
+    }
+    // Non-object keyframe value (primitive shorthand, e.g. "50%": "0.5"): there
+    // is no property bag to merge the ease into. Rebuilding from empty
+    // `properties` would wipe the primitive — leave the keyframe untouched.
+    return script;
+  }
   match.prop.value = buildKeyframeValueNode(properties, ease);
   return recast.print(loc.parsed.ast).code;
 }

packages/core/src/parsers/gsapWriterAcorn.ts

@@ -299,7 +299,7 @@ function findInsertionPoint(parsed: ParsedGsapAcornForWrite): number | null {
 export function updateAnimationInScript(
   script: string,
   animationId: string,
-  updates: Partial<GsapAnimation>,
+  updates: Partial<GsapAnimation> & { easeEach?: string },
 ): string {
   if (!Object.keys(updates).length) return script;
   const parsed = parseGsapScriptAcornForWrite(script);
@@ -324,13 +324,11 @@ export function updateAnimationInScript(
     if (updates.duration !== undefined) {
       upsertProp(ms, call.varsArg, "duration", updates.duration);
     }
-    if (updates.ease !== undefined) {
-      // For a keyframe tween, easing lives at keyframes.easeEach (per-keyframe),
-      // not a top-level ease. Writing top-level ease would leave the per-keyframe
-      // easing unchanged — the user's edit would silently do nothing.
+    const easeValue = updates.easeEach ?? updates.ease;
+    if (easeValue !== undefined) {
       const kfNode = keyframesObjectNode(call.varsArg);
-      if (kfNode) upsertProp(ms, kfNode, "easeEach", updates.ease);
-      else upsertProp(ms, call.varsArg, "ease", updates.ease);
+      if (kfNode) upsertProp(ms, kfNode, "easeEach", easeValue);
+      else upsertProp(ms, call.varsArg, "ease", easeValue);
     }
     if (updates.extras) {
       for (const [key, value] of Object.entries(updates.extras)) {
@@ -1338,6 +1336,7 @@ export function addAnimationWithKeyframesToScript(
     auto?: boolean;
   }>,
   ease?: string,
+  easeEach?: string,
 ): { script: string; id: string } {
   const parsed = parseGsapScriptAcornForWrite(script);
   if (!parsed) return { script, id: "" };
@@ -1345,7 +1344,7 @@ export function addAnimationWithKeyframesToScript(
   if (insertionPoint === null) return { script, id: "" };
 
   const sorted = [...keyframes].sort((a, b) => a.percentage - b.percentage);
-  const kfObjCode = buildKeyframeObjectCode(sorted);
+  const kfObjCode = buildKeyframeObjectCode(sorted, easeEach);
   const varParts = [`keyframes: ${kfObjCode}`, `duration: ${valueToCode(duration)}`];
   if (ease) varParts.push(`ease: ${JSON.stringify(ease)}`);
   const stmtCode = `${parsed.timelineVar}.to(${JSON.stringify(targetSelector)}, { ${varParts.join(", ")} }, ${valueToCode(position)});`;