Collection of validation rules for Quasar internal validation

validation.ts

import { isEmpty } from 'lodash-es';
import { useI18n } from 'src/boot/i18n';

const { t } = useI18n();

/**
 * Validation rule which returns true if the value is considered "not empty",
 * or an error message otherwise.
 */
export function required<T>(value: T) {
  const message = t('common.validation.required');

  if (value === undefined || value === null) {
    return message;
  }

  // Booleans and BigInts are always valid
  if (typeof value === 'bigint' || typeof value === 'boolean') {
    return true;
  }

  // A number is valid unless it's NaN
  if (typeof value === 'number') {
    return !isNaN(value) || message;
  }

  // Check for empty string, array and objects
  return !isEmpty(value) || message;
}

/**
 * Validation rule which always returns true if the condition is not met,
 * otherwise sends the value through the 'required' validation rule.
 */
export function requiredIf(conditionFn: () => boolean) {
  return <T>(value: T) => !conditionFn() || required(value);
}

/**
 * Validation rule which returns true if the value has length greater or equal to the provided value,
 * or an error message otherwise.
 */
export function minLength(length: number) {
  return <T extends { length: number }>(value: T) =>
    value.length >= length || t('common.validation.minLength', { length });
}