Function mergeTargets

mergeTargets(
    existing: Record<string, TiltifyTarget[]>,
    incoming: Record<string, TiltifyTarget[]> | undefined,
    authoritative?: boolean,
): Record<string, TiltifyTarget[]>
Accumulates targets across ticks, keyed by campaign ID then target ID.
Parameters
- existing: Record<string, TiltifyTarget[]>
  Current per-campaign target map.
- incoming: Record<string, TiltifyTarget[]> | undefined
  Fresh per-campaign target map (may be undefined).
- authoritative: boolean = false
  When true, replace the named campaigns wholesale instead of merging. Defaults to false.
Returns Record<string, TiltifyTarget[]>
Merged map with targets preserved across ticks.
- Defined in realtime-pipeline/src/reducer/tiltifyData.ts:175