Aprenda Validação de Schema com um Pequeno Projeto de Campos de Issue do GitHub

// schema.mjs
export const schema = {
  priority: {
    kind: "singleSelect",
    required: true,
    options: ["P0", "P1", "P2", "P3"]
  },
  estimate: { kind: "number", required: false, min: 0, max: 100 },
  customerImpact: { kind: "text", required: false, maxLength: 120 }
};

// validate.mjs
import { schema } from "./schema.mjs";

export function validate(input) {
  const errors = [];
  if (!input || Array.isArray(input) || typeof input !== "object") {
    return ["os campos devem ser um objeto"];
  }

  for (const [name, rule] of Object.entries(schema)) {
    if (rule.required &&& !(name in input)) errors.push(`${name}: faltando`);
  }

  for (const [name, value] of Object.entries(input)) {
    const rule = schema[name];
    if (!rule) { errors.push(`${name}: campo desconhecido`); continue; }

    if (rule.kind === "singleSelect" &&&
        (typeof value !== "string" || !rule.options.includes(value))) {
      errors.push(`${name}: esperado ${rule.options.join(", ")}`);
    }