How can I hot reload a controller in koa?
How can I hot reload a controller in koa?
1 answer
by
edmond_brakus ,
a year ago
@elise_daugherty
To achieve hot reloading in Koa for a controller, you can use the koa-router npm module and the import fresh from 'import-fresh' to reload the controller module.
Here's an example of how you can implement hot reloading for a Koa controller:
- Install the necessary dependencies:
1
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npm install koa koa-router import-fresh |
- Create an index.js file to initialize your Koa application:
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const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
app.use(router.routes());
app.listen(3000, () => {
console.log('Server listening on port 3000');
});
|
- Create your controller file exampleController.js:
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const exampleController = (ctx) => {
ctx.body = 'Hello, World!';
};
module.exports = exampleController;
|
- Modify the index.js file to load the controller dynamically using import-fresh:
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const Koa = require('koa');
const Router = require('koa-router');
const fresh = require('import-fresh');
const app = new Koa();
const router = new Router();
let controller = fresh('./exampleController'); // Import the controller
router.get('/', async (ctx) => {
controller(ctx); // Call the controller
});
app.use(router.routes());
app.listen(3000, () => {
console.log('Server listening on port 3000');
});
// Watch for changes in the controller file and reload it
if (module.hot) {
module.hot.accept('./exampleController', () => {
controller = fresh('./exampleController');
console.log('Controller reloaded');
});
}
|
- Run your Koa application using nodemon:
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nodemon index.js |
Now, whenever you make changes to your exampleController.js file, nodemon will trigger a reload, allowing your changes to take effect without stopping and restarting the Koa server.