Modular Functions layout for Firebase

call.js

export const run = (data, context) => {
    const path = data.path;
    if( path !== "bar" ) {
        throw new functions.https.HttpsError('invalid-argument', "Path was not valid");
    }
    return {foo: "bar"};
}

get.js

const cors = require('cors')({
    origin: true,
});

export const run = (req, res) => {
    const path = req.query.path;
    return cors(req, res, () => {
        if( path === "foo" ) {
            res.send({foo: "bar"}),
        }
        else {
            res.status(400).send({error: 'Invalid path'});
        }
    });
}

index.js

import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';
admin.initializeApp();

export const callableFunction = functions.https.onCall(require('./call').run);
export const getViaRest = functions.https.onRequest(require('./get').run);