refactor: monorepo setup with lerna (#243)

packages/core/src/index.ts

@@ -0,0 +1,30 @@
+import createReactClass from 'create-react-class';
+import { createElement, useCallback, useEffect, useMemo, useState } from 'react';
+
+import bootstrap from './bootstrap';
+import Registry from './lib/registry';
+
+export * from './backends';
+export * from './widgets';
+export * from './media-libraries';
+export { default as locales } from './locales';
+export * from './lib';
+
+export * from './interface';
+
+const CMS = {
+  ...Registry,
+  init: bootstrap,
+};
+
+if (typeof window !== 'undefined') {
+  window.CMS = CMS;
+  window.createClass = window.createClass || createReactClass;
+  window.useState = window.useState || useState;
+  window.useMemo = window.useMemo || useMemo;
+  window.useEffect = window.useEffect || useEffect;
+  window.useCallback = window.useCallback || useCallback;
+  window.h = window.h || createElement;
+}
+
+export default CMS;