Evan You c07751fd36 refactor: adjust createApp related API signatures
BREAKING CHANGE: `createApp` API has been adjusted.

  - `createApp()` now accepts the root component, and optionally a props
  object to pass to the root component.
  - `app.mount()` now accepts a single argument (the root container)
  - `app.unmount()` no longer requires arguments.

  New behavior looks like the following:

  ``` js
  const app = createApp(RootComponent)
  app.mount('#app')
  app.unmount()
  ```
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@vue/runtime-core

This package is published only for typing and building custom renderers. It is NOT meant to be used in applications.

For full exposed APIs, see src/index.ts. You can also run yarn build runtime-core --types from repo root, which will generate an API report at temp/runtime-core.api.md.

Building a Custom Renderer

import { createRenderer } from '@vue/runtime-core'

const { render, createApp } = createRenderer({
  patchProp,
  insert,
  remove,
  createElement,
  // ...
})

// `render` is the low-level API
// `createApp` returns an app instance with configurable context shared
// by the entire app tree.
export { render, createApp }

export * from '@vue/runtime-core'

See @vue/runtime-dom for how a DOM-targeting renderer is implemented.