feat: use scheduler postTask if possible

Author: Mister-Hope

src/nextTick/browser.ts

@@ -1,6 +1,28 @@
+interface SchedulerPostTaskOptions {
+  priority?: "user-blocking" | "user-visible" | "background";
+  delay?: number;
+  signal?: AbortSignal;
+}
+
+interface Scheduler {
+  postTask<T>(
+    callback: () => T | Promise<T>,
+    options?: SchedulerPostTaskOptions,
+  ): Promise<T>;
+
+  yield?(): Promise<void>;
+}
+
+declare global {
+  const scheduler: Scheduler | undefined;
+}
+
 /**
  * @private
  *
  * Continues with the callback on the next tick.
  */
-export const nextTick: (callback: () => void) => void = setTimeout;
+export const nextTick: (callback: () => void) => unknown =
+  typeof scheduler === "object" && typeof scheduler.postTask === "function"
+    ? scheduler.postTask.bind(scheduler)
+    : setTimeout;

src/shims.d.ts

@@ -1,3 +1,7 @@
 declare module "random" {
   export const random: (length: number) => number[] | Buffer;
 }
+
+declare module "nextTick" {
+  export const nextTick: (callback: () => void) => unknown;
+}