Lycolog

export const StatelessPage = () => {
  const history = useHistory();
  return (
    <div>
      <form>
        <input type="text" />
        <button onClick={() => history.push(AppRoute.dom2.path)}>submit</button>
      </form>
    </div>
  );
};

export const StatefullPage = () => {
  const ctx = useContext(ExampleContext);
  const history = useHistory();
  const onChange = (ev: React.ChangeEvent<HTMLInputElement>) => {
    ctx.text = ev.target.value;
  };

  return (
    <div>
      <form>
        <input
          type="text"
          defaultValue={ctx.text}
          onChange={(ev) => onChange(ev)}
        />
        <button onClick={() => history.push(AppRoute.ctx2.path)}>submit</button>
      </form>
    </div>
  );
};

{% set ns = namespace(title = "") %}
{% for doc in page.ancestors %}
    {% set ns.title = "[" + doc.title + "] " + ns.title %}
{% endfor %}

─src
    ├─app
    │   ├─configs
    │   │    └config.yaml
    │   ├─templates
    │   │         └─main.html
    │   └─__init__.py
    └─main.py

from jinja2 import Environment, PackageLoader, select_autoescape
env = Environment(
    # appはフォルダ構成のappフォルダを指す
    loader=PackageLoader('app', 'templates'),
    autoescape=select_autoescape(['html', 'xml'])
)
template = env.get_template('main.html')
# `render()` の引数は埋め込み変数を KeyValue 形式で指定
print(template.render(the='variables', go='here'))

─src
    ├─app
    │   ├─configs
    │   │    └config.yaml
    │   ├─templates
    │   │         └─main.html
    │   └─__init__.py
    └─main.py

from yaml import safe_load as yamlLoad
from jinja2 import Environment, PackageLoader, select_autoescape
env = Environment(
    loader=PackageLoader('app', 'templates'),
    autoescape=select_autoescape(['html', 'xml'])
)

template = env.get_template('main.html')
with open('app/configs/config.yaml') as fYaml:
    print(template.render(yamlLoad(fYaml)))

export const useUserForm = () => {
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');

  const onChangeUserName = (ev: string) => {
    setUsername(ev);
  };
  const onChangePassword = (ev: string) => {
    setPassword(ev);
  };

  return {
    username,
    password,
    onChangeUserName,
    onChangePassword,
  };
};

it('onChangeUserName で username が設定されること', () => {
  // `renderHook` で Hook をレンダリング
  const { result } = renderHook(() => useUserForm());
  // `act()` で Hook のイベントを叩く
  act(() => result.current.onChangeUserName('foo'));
  // 結果を見る
  expect(result.current.username).toBe('foo');
});

import { forwardRef } from 'react';

export type ChildProps = {
  type: 'text' | 'password' | 'number';
  onChange(changeValue: string): void;
};

// function 記法でないと ESLint が怒るので無効化
// eslint-disable-next-line react/display-name
export const Child = forwardRef<HTMLInputElement, ChildProps>(
  // このpropsに明示的な型定義がないと型エラーが出る
  (props: ChildProps, ref) => {
    const onChange = (ev: React.ChangeEvent<HTMLInputElement>) => {
      props.onChange(ev.target.value);
    };

    return (
      <input
        ref={ref}
        type={props.type}
        onChange={(ev) => onChange(ev)}
      />
    );
  }
);

import { useEffect, useRef } from 'react';
import { Child } from './Child';

export const Parent = () => {
  const ref = useRef<HTMLInputElement>(null);
  useEffect(() => {
    ref?.current?.focus();
  }, []);
  return (
    <ul>
      <li>
        <Child
          type={'text'}
          onChange={(ev) => console.log('top input', ev)}
        />
      </li>
      <li>
        <Child
          ref={ref}
          type={'text'}
          onChange={(ev) => console.log('bottom input', ev)}
        />
      </li>
    </ul>
  );
};