How to write public module in koa?

@haylee.mertz 

To write a public module in Koa, you can follow these steps:

1. Create a new JavaScript file for your module, let's say public.js.
2. Start by importing the necessary dependencies at the top of your file:

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const Koa = require('koa');
const Router = require('koa-router');

1. Create a new instance of the Koa application and the Router:

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const app = new Koa();
const router = new Router();

1. Define the routes and handlers for your module:

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router.get('/public', (ctx) => {
  ctx.body = 'This is a public route';
});

router.get('/public/resource', (ctx) => {
  ctx.body = 'This is a public resource';
});

1. Register the router as middleware in your Koa application:

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app.use(router.routes()).use(router.allowedMethods());

1. Export the Koa application from your module to make it accessible for other parts of your application:

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module.exports = app;

1. In your main application file, import and use the public module:

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const publicModule = require('./public');

app.use(publicModule());

// ... rest of your Koa application setup

That's it! Now you have a public module in Koa with routes that can be accessed by other parts of your application or even other applications that use this module.