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@types/koa-compose

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@types/koa-compose

TypeScript definitions for koa-compose

  • 3.2.8
  • ts4.5
  • ts4.6
  • ts4.7
  • ts4.8
  • ts4.9
  • ts5.0
  • ts5.1
  • ts5.2
  • ts5.3
  • ts5.4
  • ts5.5
  • ts5.6
  • ts5.7
  • ts5.8
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What is @types/koa-compose?

@types/koa-compose provides TypeScript definitions for the koa-compose package, which is a middleware composition library for Koa.js. It allows you to compose multiple middleware functions into a single middleware function, making it easier to manage and organize your middleware stack.

What are @types/koa-compose's main functionalities?

Compose Middleware

This feature allows you to compose multiple middleware functions into a single middleware function. The composed middleware can then be used in a Koa application.

const compose = require('koa-compose');
const Koa = require('koa');
const app = new Koa();

const middleware1 = async (ctx, next) => {
  console.log('Middleware 1');
  await next();
};

const middleware2 = async (ctx, next) => {
  console.log('Middleware 2');
  await next();
};

const composedMiddleware = compose([middleware1, middleware2]);

app.use(composedMiddleware);

app.listen(3000);

Error Handling in Middleware

This feature demonstrates how to handle errors in composed middleware. The errorHandler middleware catches any errors thrown by subsequent middleware and handles them appropriately.

const compose = require('koa-compose');
const Koa = require('koa');
const app = new Koa();

const errorHandler = async (ctx, next) => {
  try {
    await next();
  } catch (err) {
    ctx.status = err.status || 500;
    ctx.body = err.message;
    ctx.app.emit('error', err, ctx);
  }
};

const middleware = async (ctx, next) => {
  throw new Error('Something went wrong');
};

const composedMiddleware = compose([errorHandler, middleware]);

app.use(composedMiddleware);

app.listen(3000);

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Package last updated on 07 Nov 2023

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