src/composable/validation.ts


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import { reactive, watch, type Ref } from 'vue';

type UseValidationRule<T> = {
  validator: (value: T) => boolean;
  message: string;
};

export function useValidation<T>({ source, rules }: { source: Ref<T>; rules: UseValidationRule<T>[] }) {
  const state = reactive<{
    message: string;
    status: undefined | 'error';
  }>({
    message: '',
    status: undefined,
  });

  watch([source], () => {
    state.message = '';
    state.status = undefined;

    for (const rule of rules) {
      if (!rule.validator(source.value)) {
        state.message = rule.message;
        state.status = 'error';
      }
    }
  });

  return state;
}