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@koph-npm/promise-once

v0.0.2

Published

> Garante que uma promise nomeada seja executada apenas uma vez por chave, mesmo com chamadas concorrentes.

Downloads

1

Readme

@koph-npm/promise-once

Garante que uma promise nomeada seja executada apenas uma vez por chave, mesmo com chamadas concorrentes.

Este utilitário é ideal para cenários onde você deseja evitar chamadas simultâneas duplicadas de uma mesma promise, como requisições para um endpoint ou inicialização de recursos.


📦 Instalação

npm install @koph-npm/promise-once

🚀 Uso básico

import { promiseOnce } from '@koph-npm/promise-once';

async function fetchConfig() {
  return await promiseOnce("config", async () => {
    const res = await fetch("/api/config");
    return await res.json();
  });
}

// Mesmo com chamadas simultâneas, a função será executada uma vez
const [a, b] = await Promise.all([fetchConfig(), fetchConfig()]);

🧠 API

promiseOnce<T>(key: string, callback: () => Promise<T>): Promise<T>

  • key: Identificador exclusivo da promise
  • callback: Função que retorna uma promise
  • Retorna: Promise resolvida ou rejeitada da execução original

⚠️ Observações

  • A promise é removida do cache após ser resolvida ou rejeitada (finally).
  • Erros síncronos durante a chamada do callback() são tratados corretamente.
  • Adequado para uso com async/await, loaders e caches temporários.

📄 Licença

MIT


👤 Autor

Koph [email protected]


🔗 Repositório

https://github.com/koph-git/ts-lib