app/services/asserts/MaxAssert.ts

import type {AssertRule} from "~/types/interfaces";

export class MaxAssert implements AssertRule {
  supports(key: string): boolean {
    return key === 'max';
  }

  createRule(criteria: number): (value: string) => true | string {
    return (value: string) =>
      value.length <= criteria || `Maximum ${criteria} caractères`;
  }
}