react-hook-form/src/logic/getFieldValue.ts

import type { Field } from '../types';
import isCheckBox from '../utils/isCheckBoxInput';
import isFileInput from '../utils/isFileInput';
import isMultipleSelect from '../utils/isMultipleSelect';
import isRadioInput from '../utils/isRadioInput';
import isUndefined from '../utils/isUndefined';

import getCheckboxValue from './getCheckboxValue';
import getFieldValueAs from './getFieldValueAs';
import getRadioValue from './getRadioValue';

export default function getFieldValue(_f: Field['_f']) {
  const ref = _f.ref;

  if (isFileInput(ref)) {
    return ref.files;
  }

  if (isRadioInput(ref)) {
    return getRadioValue(_f.refs).value;
  }

  if (isMultipleSelect(ref)) {
    return [...ref.selectedOptions].map(({ value }) => value);
  }

  if (isCheckBox(ref)) {
    return getCheckboxValue(_f.refs).value;
  }

  return getFieldValueAs(isUndefined(ref.value) ? _f.ref.value : ref.value, _f);
}