Beware

Lightweight async/await middleware library (formerly middlewerewolf)

Installation

yarn add beware

Usage

import Beware from "beware";
let app = new Beware();

// This middleware will execute without issue
app.use(async (ctx, next) => {
  ctx.foo = true;
  await next();
});

// This middleware will execute, but does not call next()
app.use(async ctx => {
  ctx.bar = true;
});

// This middleware will not execute, as the previous middleware
// did not call next()
app.use(async ctx => {
  ctx.baz = true;
});

// Register multiple middleware with a single command
app.all([
  async ctx => {
    ctx.foo = true;
    await next();
  },
  async ctx => {
    ctx.bar = true;
    await next();
  }
]);

// Compose a new middleware execution chain
let fn = app.compose();

// Execute the chain
fn({
  initial_context: true
}).then(ctx => {
  console.log("All done here!");
}).catch(err => {
  console.log("Handle errors like a boss.");
});

Build beware

git clone [email protected]:aewing/beware.git
cd beware/
make lint
make flow
make test
make build

Contributing

Pull requests are welcome, but I intend to keep this package as lightweight and future compliant as possible.

Credits

Much love to koa-compose, which inspired this package.