index.jsx

import { Form, TextInput, PasswordInput } from 'a-plus-forms';

const signIn = ({ username, password }) =>
  axios.post('/users', { username, password });

<Form onSubmit={signIn}>
  <TextInput name="username" label="Username" />
  <PasswordInput name="password" label="Password" />
  <button type="submit">Sign In</button>
</Form>