fix: hold external sub-compositions through host duration#917
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miguel-heygen merged 1 commit intoMay 17, 2026
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Pull request overview
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Updates runtime visibility duration clamping so external composition hosts remain visible for their authored slot duration even when their child timeline is shorter, and adds a regression test for that behavior.
Changes:
- Adjust visibility window calculation to skip
Math.min(authoredDuration, liveTimelineDuration)fordata-composition-srchosts. - Refresh related inline comments around stripping timing attrs.
- Add a unit test covering external composition host visibility through authored duration.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| packages/core/src/runtime/init.ts | Updates visibility-duration reconciliation for external composition hosts. |
| packages/core/src/runtime/init.test.ts | Adds test ensuring external composition hosts stay visible through authored duration. |
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| const usesExternalCompositionSlot = rawNode.hasAttribute("data-composition-src"); | ||
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| // Generic child compositions retain legacy behavior and respect both | ||
| // the authored parent clip window and the live child timeline duration. | ||
| // External composition hosts render into an authored slot, so a shorter | ||
| // child timeline should hold its final state through that slot. | ||
| if ( | ||
| duration != null && | ||
| duration > 0 && | ||
| liveDuration != null && | ||
| !usesExternalCompositionSlot | ||
| ) { |
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| initSandboxRuntimeModular(); | ||
| await new Promise<void>((resolve) => window.setTimeout(resolve, 0)); | ||
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| const player = ( | ||
| window as Window & { | ||
| __player?: { renderSeek: (timeSeconds: number) => void }; | ||
| } | ||
| ).__player; |
miguel-heygen
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Real bug, clean fix. APPROVE.
The problem: When a sub-composition is loaded via data-composition-src with a host data-duration="3" but its child GSAP timeline is only 1s long, the visibility system clamps to Math.min(3, 1) = 1 — the sub-composition vanishes 2s early. The parent authored a 3s window; the child's final frame should hold through it.
Why the fix is correct: The duration derivation path is:
- Stripping phase preserves
data-durationas privatedata-hf-authored-durationbefore removing it resolveDurationForElement()reads the private attr (defaults toincludeAuthoredTimingAttrs: true) → returns the authored 3s- The new
!usesExternalCompositionSlotguard skips theMath.min(duration, liveDuration)clamp for external hosts data-composition-srcis never stripped, sorawNode.hasAttribute("data-composition-src")is reliable at this point in the lifecycle- GSAP
{ paused: true }timelines hold their final state when seeked past their end — so the visual hold is correct
Legacy behavior preserved: Inline child compositions (without data-composition-src) still clamp via Math.min — the !usesExternalCompositionSlot condition is false for them.
Test coverage: The regression test sets up the exact scenario (3s host, 1s child, seek to t=2) and asserts visibility. Good.
miguel-heygen
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May 17, 2026
PR #917 fixed visibility clamping for external sub-compositions in preview mode by checking data-composition-src. However, the producer's htmlCompiler strips that attribute during inlining without setting the data-composition-file marker that the core bundler sets. This caused the runtime to still clamp duration to Math.min(authored, live) in rendered output. Two fixes: - Runtime: also check data-composition-file (set by the core bundler after inlining) - Producer: set data-composition-file before removing data-composition-src, matching the core bundler's behavior Closes #911 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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miguel-heygen
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A sub-composition mount whose data-duration ends before the host composition's window leaves its slot blank for the remainder. The runtime behavior is correct (data-duration is the slot's visible window and takes precedence), but a full-bleed sub-composition shorter than the composition is almost always an authoring mistake that fails silently (issue #1540). Add the subcomposition_blanks_before_host rule, scoped narrowly to the high-signal shape — a sole/dominant external mount starting at ~0 whose window ends before the host's — so it stays silent on intentional short clips. Document the slot-window semantics in the sub-compositions reference, distinguishing the hold-through-slot case (#911/#917) from the blank-when-shorter-than-host case.
miguel-heygen
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A sub-composition mount whose data-duration ends before the host composition's window leaves its slot blank for the remainder. The runtime behavior is correct (data-duration is the slot's visible window and takes precedence), but a full-bleed sub-composition shorter than the composition is almost always an authoring mistake that fails silently (issue #1540). Add the subcomposition_blanks_before_host rule, scoped narrowly to the high-signal shape — a sole/dominant external mount starting at ~0 whose window ends before the host's — so it stays silent on intentional short clips. Document the slot-window semantics in the sub-compositions reference, distinguishing the hold-through-slot case (#911/#917) from the blank-when-shorter-than-host case.
miguel-heygen
added a commit
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Jun 17, 2026
…1542) A sub-composition mount whose data-duration ends before the host composition's window leaves its slot blank for the remainder. The runtime behavior is correct (data-duration is the slot's visible window and takes precedence), but a full-bleed sub-composition shorter than the composition is almost always an authoring mistake that fails silently (issue #1540). Add the subcomposition_blanks_before_host rule, scoped narrowly to the high-signal shape — a sole/dominant external mount starting at ~0 whose window ends before the host's — so it stays silent on intentional short clips. Document the slot-window semantics in the sub-compositions reference, distinguishing the hold-through-slot case (#911/#917) from the blank-when-shorter-than-host case.
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Summary
data-composition-srchosts visible for their authoreddata-durationeven when the child GSAP timeline isshorter.
Verification
bun run --filter @hyperframes/core test:hyperframe-runtime-cibun run --filter @hyperframes/core testbun run --filter @hyperframes/core typecheckbunx oxfmt --check packages/core/src/runtime/init.ts packages/core/src/runtime/init.test.ts