Function sliceAndSplice

src/compat/firestore/collection/changes.ts:82–91

* Splice arguments on top of a sliced array, to break top-level === * this is useful for change-detection

(
  original: T[],
  start: number,
  deleteCount: number,
  ...args: T[]
)

 * this is useful for change-detection
 */
function sliceAndSplice<T>(
  original: T[],
  start: number,
  deleteCount: number,
  ...args: T[]
): T[] {
  const returnArray = original.slice();
  returnArray.splice(start, deleteCount, ...args);
  return returnArray;
}

/**
 * Creates a new sorted array from a new change.