east Function – refinePair

const refinePair: <T, K extends keyof<T>>(
  pair: Pair<T>,
  key: K,
  defaults?: Record<K, any>,
) => Pair<T[K]>

Refine a getter/updater pair to traverse its value[key] and produce new pair.

If defaults are supplied, the cursor will merge them in.

When the first update is made, it will dispatch a $set operation first to permanently insert them, and allow a clean patch to be made.

Source

packages / state / src / cursor.ts