# @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
``` ts
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.