Function initialMicrostep

packages/core/src/stateUtils.ts:984–1008

(
  root: AnyStateNode,
  preInitialState: AnyMachineSnapshot,
  actorScope: AnyActorScope,
  initEvent: AnyEventObject,
  internalQueue: AnyEventObject[]
)

type Microstep = readonly [AnyMachineSnapshot, ExecutableActionObject[]];

export function initialMicrostep(
  root: AnyStateNode,
  preInitialState: AnyMachineSnapshot,
  actorScope: AnyActorScope,
  initEvent: AnyEventObject,
  internalQueue: AnyEventObject[]
): Microstep {
  return microstep(
    [
      {
        target: [...getInitialStateNodes(root)],
        source: root,
        reenter: true,
        actions: [],
        eventType: null as any,
        toJSON: null as any
      }
    ],
    preInitialState,
    actorScope,
    initEvent,
    true,
    internalQueue
  );
}

/** https://www.w3.org/TR/scxml/#microstepProcedure */
function microstep(