Junction Express Middleware
Requirements: Node.js 6+
Express middleware to automatically setup/flush Junction pre/post request-response cycle
Install
yarn add junction-express-middleware
Example
import {junctionProvider, junctionFlush, setData} from 'junction-express-middleware';
app.use(junctionProvider(entityManager));
// or app.use(junctionProvider(entities, mapper)) to have the provider create the entityManager for you before returning the middleware
// ... add normal routes
async function someFunctionCalledInRoute(req, res, next) {
try {
const service = req.junction.get(FooService);
const data = await service.asyncTaskReturningSomethingOfValue();
setData(res, next, data);
}
catch(error) {
next(error);
}
}
// flush modifications and return JSON of whatever is stored in res.locals.data
// if res.locals.data is a function then it will return the result of that function call
app.use(junctionFlush);