Add drawer component

frontend/src/component/ui/Drawer.scss

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+@import '../styles/color';
+@import '../styles/easing';
+
+$drawer-width: 240px;
+
+.drawer {
+  width: $drawer-width;
+  margin-left: -$drawer-width;
+  transition: margin-left 300ms $ease-in-out-quart;
+
+  &.open {
+    margin-left: 0;
+  }
+}

frontend/src/component/ui/Drawer.spec.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import { Drawer } from './Drawer';
+
+describe('Drawer component', () => {
+  test('should render without crash', () => {
+    render(<Drawer />);
+  });
+
+  test('should render in open state by default', () => {
+    const { container } = render(<Drawer />);
+
+    const drawer = container.querySelector('.drawer');
+    expect(drawer).toBeTruthy();
+    expect(drawer!.className).toContain('open');
+  });
+
+  test('should close the drawer when triggered to close', () => {
+    const drawerRef = React.createRef<Drawer>();
+    const { container } = render(<Drawer ref={drawerRef} />);
+
+    const drawer = container.querySelector('.drawer');
+    expect(drawer).toBeTruthy();
+    expect(drawer!.className).toContain('open');
+
+    drawerRef.current!.close();
+    expect(drawer!.className).not.toContain('open');
+  });
+
+  test('should open the drawer when triggered to open', () => {
+    const drawerRef = React.createRef<Drawer>();
+    const { container } = render(<Drawer ref={drawerRef} />);
+
+    const drawer = container.querySelector('.drawer');
+    expect(drawer).toBeTruthy();
+    drawerRef.current!.close();
+    expect(drawer!.className).not.toContain('open');
+
+    drawerRef.current!.open();
+    expect(drawer!.className).toContain('open');
+  });
+
+  test('should render component children correctly', () => {
+    const childContent = 'children of drawer component';
+    const { container } = render(<Drawer> {childContent} </Drawer>);
+
+    expect(container.textContent).toContain(childContent);
+  });
+});

frontend/src/component/ui/Drawer.tsx

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+import React, { Component } from 'react';
+
+import './Drawer.scss';
+import classNames from 'classnames';
+
+interface IProps {}
+
+interface IState {
+  isOpen: boolean;
+}
+
+export class Drawer extends Component<IProps, IState> {
+  constructor(props: IProps) {
+    super(props);
+    this.state = {
+      isOpen: true
+    };
+  }
+
+  open() {
+    this.setState({ isOpen: true });
+  }
+
+  close() {
+    this.setState({ isOpen: false });
+  }
+
+  render() {
+    const isOpen = this.state.isOpen;
+    return (
+      <div
+        className={classNames({
+          drawer: true,
+          open: isOpen
+        })}
+      >
+        {this.props.children}
+      </div>
+    );
+  }
+}