Function getFlatUnderlineColor

src/components/TextInput/helpers.tsx:425–447

({
  theme,
  disabled,
  underlineColor,
}: BaseProps & { underlineColor?: string })

};

const getFlatUnderlineColor = ({
  theme,
  disabled,
  underlineColor,
}: BaseProps & { underlineColor?: string }) => {
  if (!disabled && underlineColor) {
    return underlineColor;
  }

  if (theme.isV3) {
    if (disabled) {
      return theme.colors.onSurfaceDisabled;
    }

    return theme.colors.onSurfaceVariant;
  }

  if (disabled) {
    return 'transparent';
  }

  return theme.colors.disabled;
};

const getOutlinedOutlineInputColor = ({
  theme,