JavaScript FlatMap Empty Results Film

Create a 12-second array animation from [tested flatMap inputs]. Expand each callback result one level, keeping undefined as a visible token and empty arrays as no output. Leave deeper arrays nested. End with [verified final element count], with source-to-output links preserved.

Confirm required reference images and timing inputs are present before generating. Keep objects, identities, spatial relationships and light direction consistent. Render the clip when video generation is supported; otherwise supply a timed shot list, reference checklist and generation-ready prompt, labeled as a production plan. Do not claim rendered output without an actual file. Check the opening, transition and final frame against the stated counts and geometry.