SignInForm.tsx

import React, { FC } from 'react';
import { useForm, Controller } from 'react-hook-form';
import { createStyles, makeStyles, Theme } from '@material-ui/core/styles';
import { TextField, Button } from '@material-ui/core';
import { DevTool } from '@hookform/devtools';

const useStyles = makeStyles((theme: Theme) =>
  createStyles({
    root: {
      '& > *': {
        margin: theme.spacing(0),
      },
    },
    form: {
      width: '100%', // Fix IE 11 issue.
      marginTop: theme.spacing(1),
    },
    submit: {
      margin: theme.spacing(3, 0, 2),
    },
  }),
);
// TODO: real time form validation
export const SignInForm: FC = () => {
  interface FormData {
    email: string;
    password: string;
  }

  const defaultValues: FormData = {
    email: '',
    password: '',
  };

  const { control, register, errors, handleSubmit } = useForm<FormData>({
    defaultValues,
  });

  const onSubmit: any = (values: FormData) => {
    alert(JSON.stringify(values));
  };
  const classes = useStyles();
  return (
    <>
      <form
        className={classes.form}
        onSubmit={handleSubmit(onSubmit)}
        data-testid="Form"
      >
        <Controller
          name="email"
          control={control}
          defaultValues
          rules={{
            validate: (value) =>
              /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i.test(value),
            required: { value: true, message: 'You must enter your email' },
          }}
          render={() => (
            <TextField
              variant="outlined"
              margin="normal"
              required
              fullWidth
              id="email"
              label="Email Address"
              name="email"
              autoComplete="email"
              autoFocus
              error={Boolean(errors.email)}
              helperText={errors.email && 'Incorrect entry.'}
            />
          )}
        />

        <Controller
          name="password"
          control={control}
          defaultValues
          rules={{
            minLength: 8,
            maxLength: 60,
            required: { value: true, message: 'You must enter your name' },
          }}
          render={() => (
            <TextField
              variant="outlined"
              margin="normal"
              required
              fullWidth
              name="password"
              label="Password"
              type="password"
              id="password"
              autoComplete="password"
              autoFocus
              error={Boolean(errors.password)}
              helperText={errors.password && 'Incorrect entry.'}
            />
          )}
        />

        <Button
          type="submit"
          fullWidth
          variant="contained"
          color="primary"
          data-testid="Submit"
          className={classes.submit}
        >
          Sign In
        </Button>
      </form>
      <DevTool control={control} /> {/* set up the dev tool */}
    </>
  );
};