@types/koa

What is @types/koa?

The @types/koa package provides TypeScript type definitions for Koa, a web framework designed for building efficient and scalable Node.js applications. It enables TypeScript developers to work with Koa in a type-safe manner, offering autocompletion and type checking for Koa's API.

What are @types/koa's main functionalities?

Application Creation

This feature allows developers to create a new Koa application. The type definitions ensure that the application is created with the correct structure expected by Koa.

import Koa from 'koa';
const app = new Koa();

Middleware

Middleware functions can be added to the application. These functions can perform operations, modify the request and response objects, end the request-response cycle, and call the next middleware in the stack. Type definitions help ensure middleware functions adhere to the expected signature.

app.use(async (ctx, next) => {
  ctx.body = 'Hello World';
  await next();
});

Context Manipulation

This feature demonstrates how to manipulate the context (`ctx`) to send responses. The type definitions provide autocompletion and type checking for context properties and methods.

app.use(async ctx => {
  ctx.body = { message: 'Hello World' };
});

Other packages similar to @types/koa

express

Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications. Unlike @types/koa, which is specifically for Koa and requires separate type definitions, Express itself is written in JavaScript but has a separate @types/express package for TypeScript support.

fastify

Fastify is a fast and low overhead web framework for Node.js. It is designed to be as fast as possible and to provide an excellent developer experience. It has built-in TypeScript support, offering a different approach compared to @types/koa, where types are provided externally.

hapi

Hapi is a rich framework for building applications and services, allowing developers to focus on writing reusable application logic instead of spending time building infrastructure. Similar to Koa, it has a vibrant ecosystem and plugins. For TypeScript users, @types/hapi provides the type definitions, similar to how @types/koa works for Koa.

README

Installation

npm install --save @types/koa

Summary

This package contains type definitions for Koa (http://koajs.com).

Details

Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/koa

Additional Details

• Last updated: Thu, 07 Nov 2019 17:55:20 GMT
• Dependencies: @types/accepts, @types/cookies, @types/http-assert, @types/keygrip, @types/koa-compose, @types/node
• Global values: none

Credits

These definitions were written by DavidCai1993 https://github.com/DavidCai1993, jKey Lu https://github.com/jkeylu, Brice Bernard https://github.com/brikou, and harryparkdotio https://github.com/harryparkdotio.