init (graduate from prototype)

packages/scheduler/.npmignore

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+__tests__/
+__mocks__/
+dist/packages

packages/scheduler/README.md

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+# @vue/scheduler
+
+> This package is published only for typing and building custom renderers. It is NOT meant to be used in applications.

packages/scheduler/index.js

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+'use strict'
+
+if (process.env.NODE_ENV === 'production') {
+  module.exports = require('./dist/scheduler.cjs.prod.js')
+} else {
+  module.exports = require('./dist/scheduler.cjs.js')
+}

packages/scheduler/package.json

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+{
+  "name": "@vue/scheduler",
+  "version": "3.0.0-alpha.1",
+  "description": "@vue/scheduler",
+  "main": "index.js",
+  "module": "dist/scheduler.esm.js",
+  "typings": "dist/index.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/vuejs/vue.git"
+  },
+  "keywords": [
+    "vue"
+  ],
+  "author": "Evan You",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/vuejs/vue/issues"
+  },
+  "homepage": "https://github.com/vuejs/vue/tree/dev/packages/scheduler#readme"
+}

packages/scheduler/src/index.ts

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+const queue: Array<() => void> = []
+const postFlushCbs: Array<() => void> = []
+const p = Promise.resolve()
+let flushing = false
+
+export function nextTick(fn: () => void) {
+  p.then(fn)
+}
+
+export function queueJob(job: () => void, postFlushCb?: () => void) {
+  if (queue.indexOf(job) === -1) {
+    if (flushing) {
+      job()
+    } else {
+      queue.push(job)
+    }
+  }
+  if (postFlushCb) {
+    queuePostFlushCb(postFlushCb)
+  }
+  if (!flushing) {
+    nextTick(flushJobs)
+  }
+}
+
+export function queuePostFlushCb(cb: () => void) {
+  postFlushCbs.push(cb)
+}
+
+export function flushJobs() {
+  flushing = true
+  let job
+  while ((job = queue.shift())) {
+    job()
+  }
+  while ((job = postFlushCbs.shift())) {
+    job()
+  }
+  flushing = false
+}