# @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, createAppAPI } from '@vue/runtime-core' const { render, createApp } = createRenderer({ pathcProp, 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.