use-uncontrolled

import { useUncontrolled } from '@mantine/hooks';

interface CustomInputProps {
  value?: string;
  defaultValue?: string;
  onChange?: (value: string) => void;
}

function CustomInput({
  value,
  defaultValue,
  onChange,
}: CustomInputProps) {
  const [_value, handleChange] = useUncontrolled({
    value,
    defaultValue,
    finalValue: 'Final',
    onChange,
  });

  return (
    <input
      type="text"
      value={_value}
      onChange={(event) => handleChange(event.currentTarget.value)}
    />
  );
}

import { useUncontrolled } from '@mantine/hooks';

function Demo() {
  const [_value, handleChange] = useUncontrolled<number>({
    value: 10,
    defaultValue: 5,
    finalValue: 20,
    onChange: (val) => console.log(val > 10),
  });
}

interface UseUncontrolledInput<T> {
  /** Value for controlled state */
  value?: T;

  /** Initial value for uncontrolled state */
  defaultValue?: T;

  /** Final value for uncontrolled state when value and defaultValue are not provided */
  finalValue?: T;

  /** Controlled state onChange handler */
  onChange?: (value: T) => void;
}

function useUncontrolled<T>(input: UseUncontrolledInput<T>): [
  T, // current value
  (value: T) => void, // onChange function
  boolean, // value that indicates if input is controlled or not
];