introduced yarn workspace

packages/web/src/TabContent.js

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+import React from 'react';
+import styled from 'styled-components';
+import theme from './theme';
+import tabs from './tabs';
+
+import { useOpenedTabs } from './utility/globalState';
+
+export default function TabContent() {
+  const files = useOpenedTabs();
+
+  const selectedTab = files.find(x => x.selected);
+  if (!selectedTab) return null;
+
+  const TabComponent = tabs[selectedTab.tabComponent];
+  if (TabComponent) return <TabComponent {...selectedTab.props} />;
+
+  return null;
+}