# watch and auto re-build dist/vue.js
$ npm run dev

"scripts": {
  "dev": "rollup -w -c build/config.js --environment TARGET:web-full-dev",
  ...
}

...
const builds = {
 ...
 'web-full-dev': {
   entry: resolve('web/entry-runtime-with-compiler.js'),
   dest: resolve('dist/vue.js'),
   format: 'umd',
   env: 'development',
   alias: { he: './entity-decoder' },
   banner
 },
 ...
}

module.exports = {
 vue: path.resolve(__dirname, '../src/platforms/web/entry-runtime-with-compiler'),
 compiler: path.resolve(__dirname, '../src/compiler'),
 core: path.resolve(__dirname, '../src/core'),
 shared: path.resolve(__dirname, '../src/shared'),
 web: path.resolve(__dirname, '../src/platforms/web'),
 weex: path.resolve(__dirname, '../src/platforms/weex'),
 server: path.resolve(__dirname, '../src/server'),
 entries: path.resolve(__dirname, '../src/entries'),
 sfc: path.resolve(__dirname, '../src/sfc')
}

import Vue from './runtime/index'

import Vue from 'core/index'
...
...
import platformDirectives from './directives/index'
import platformComponents from './components/index'

...
// install platform runtime directives & components
extend(Vue.options.directives, platformDirectives)
extend(Vue.options.components, platformComponents)

// install platform patch function
Vue.prototype.__patch__ = inBrowser ? patch : noop

export default {
 name: 'transition',
 props: transitionProps,
 abstract: true,

 render (h: Function) {
  ...
 }
}

export function enter (vnode: VNodeWithData, toggleDisplay: ?() => void) {
 ...
}
export function leave (vnode: VNodeWithData, rm: Function) {
 ...
}

export default inBrowser ? {
 create: _enter,
 activate: _enter,
 remove (vnode: VNode, rm: Function) {
  /* istanbul ignore else */
  if (vnode.data.show !== true) {
   leave(vnode, rm)
  } else {
   rm()
  }
 }
} : {}

// el就是真实dom节点
beforeEnterHook && beforeEnterHook(el)
if (expectsCSS) {
 addTransitionClass(el, startClass)
 addTransitionClass(el, activeClass)
 nextFrame(() => {
  addTransitionClass(el, toClass)
  removeTransitionClass(el, startClass)
  if (!cb.cancelled && !userWantsControl) {
   if (isValidDuration(explicitEnterDuration)) {
    setTimeout(cb, explicitEnterDuration)
   } else {
    whenTransitionEnds(el, type, cb)
   }
  }
 })
}

const raf = inBrowser && window.requestAnimationFrame
 ? window.requestAnimationFrame.bind(window)
 : setTimeout

export function nextFrame (fn: Function) {
 raf(() => {
  raf(fn)
 })
}

<p>xxx</p>
<!---->