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Vance IngallsandClaude Opus 4.8
b5ad518957
The acorn addKeyframeToScript mixed ms.overwrite + ms.appendLeft on the
same _auto endpoint node, crashing MagicString ("Cannot split a chunk
that has already been edited") whenever an interior keyframe adjacent to
an _auto 0/100 endpoint introduced a new backfilled prop — the common SDK
path. It also replaced (not merged) existing keyframes, dropped ease and
_auto markers, corrupted commas on multi-prop backfill into empty {},
used a <0.001 percentage tolerance instead of recast's PCT_TOLERANCE=2,
and silently no-op'd on flat (non-keyframe) tweens.
Rebuild the node model to mirror recast: compute the FINAL property record
for every changed keyframe value node (target merge, _auto endpoint sync,
backfilled siblings) against the original AST, then emit exactly one
ms.overwrite per changed node (one insert for a brand-new key). No node is
ever both overwritten and appended into, so splices can never overlap.
- Merge: re-touching an existing keyframe merges new props over the
existing record, preserving untouched props, existing ease, and _auto.
- Convert-flat: first keyframe-add on a flat to()/from()/fromTo() tween
rebuilds its vars object to percentage keyframes (ease->easeEach,
ease:"none", from/fromTo->to) matching recast, then re-locates via the
-from-/-fromTo- -> -to- id fallback.
- Tolerance: PCT_TOLERANCE=2 for existing-keyframe detection.
- Shared serializeValue/safeJsKey for keyframe values (recast parity); the
tween-statement path keeps its local serializer for object/boolean extras.
- keyframeBackfill: only backfill props with a real numeric default; skip
unknown/string props so color:0 / filter:0 are never emitted.
- setGsapKeyframe move-path threads the same backfill defaults as the add
path so both entry points behave identically.
Differential tests (acorn vs recast parsed keyframe arrays) cover the
crash (2-endpoint + 0/25/100), empty-{} multi-prop backfill, merge with
extra props + ease, flat to()/fromTo() convert, "50.0%" non-byte-equal
key, near-% tolerance, and _auto-marker preservation onto an endpoint.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>