Function isArray

packages/pluginutils/src/utils/ensureArray.ts:2–4

(arg: unknown)

// Helper since Typescript can't detect readonly arrays with Array.isArray
function isArray(arg: unknown): arg is any[] | readonly any[] {
  return Array.isArray(arg);
}

export default function ensureArray<T>(thing: readonly T[] | T | undefined | null): readonly T[] {
  if (isArray(thing)) return thing;