Libs

Epos is built on top of several libraries, such as React and MobX.

They are exposed through epos.libs, and with the Epos Vite plugin you can import them normally.

Available Libraries

Epos includes these libraries:

• react 19.2.4 - React.
• react-dom 19.2.4 - Base React DOM package.
• react-dom/client 19.2.4 - Client-side React DOM APIs.
• react/jsx-runtime 19.2.4 - React JSX runtime.
• mobx 6.15.0 - State management and reactivity.
• mobx-react-lite 4.1.1 - React bindings for MobX.
• yjs 13.6.30 - State synchronization.

All of them are included in the exported extension. You do not need to install them separately.

Accessing Libraries

All built-in libraries are exposed through epos.libs. For example, to use React:

const { useState } = epos.libs.react

Library names are converted to camelCase, so react/jsx-runtime becomes epos.libs.reactJsxRuntime:

const { jsx } = epos.libs.reactJsxRuntime

Setting Up Vite

As explained in the Setup guide, you should use the epos/vite plugin so Vite resolves these libraries to the built-in Epos versions instead of trying to load them from node_modules.

vite.config.ts

import { epos } from 'epos/vite'
import { defineConfig } from 'vite'

export default defineConfig({
  plugins: [epos()],
  ...
})

This plugin lets you import the libraries as usual:

import { useState } from 'react'

Under the hood, those imports are transformed to:

const { useState } = epos.libs.react

So in most cases, you do not need to use epos.libs directly. You can import these libraries normally, and the Vite plugin handles the rest.