the latest code

node_modules/rxjs/src/internal/scheduler/Action.ts

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+import { Scheduler } from '../Scheduler';
+import { Subscription } from '../Subscription';
+import { SchedulerAction } from '../types';
+
+/**
+ * A unit of work to be executed in a `scheduler`. An action is typically
+ * created from within a {@link SchedulerLike} and an RxJS user does not need to concern
+ * themselves about creating and manipulating an Action.
+ *
+ * ```ts
+ * class Action<T> extends Subscription {
+ *   new (scheduler: Scheduler, work: (state?: T) => void);
+ *   schedule(state?: T, delay: number = 0): Subscription;
+ * }
+ * ```
+ */
+export class Action<T> extends Subscription {
+  constructor(scheduler: Scheduler, work: (this: SchedulerAction<T>, state?: T) => void) {
+    super();
+  }
+  /**
+   * Schedules this action on its parent {@link SchedulerLike} for execution. May be passed
+   * some context object, `state`. May happen at some point in the future,
+   * according to the `delay` parameter, if specified.
+   * @param state Some contextual data that the `work` function uses when called by the
+   * Scheduler.
+   * @param delay Time to wait before executing the work, where the time unit is implicit
+   * and defined by the Scheduler.
+   * @return A subscription in order to be able to unsubscribe the scheduled work.
+   */
+  public schedule(state?: T, delay: number = 0): Subscription {
+    return this;
+  }
+}