actions.js

//assistant-actions.js
module.exports = {
    //...
    ACTION_FACTS_DRINKING_WATER: 'facts_drinking_water'
};

//index.js
exports.waterLog = functions.https.onRequest((request, response) => {
    //...
    
    //Define map of Dialogflow agent Intents
    let actionMap = new Map();
    //...
    actionMap.set(Actions.ACTION_FACTS_DRINKING_WATER, () => conversation.getFactForDrinkingWater());

    //Handle request from Dialogflow (will be dispatched into appropriate action defined above)
    dialogflowApp.handleRequest(actionMap);
});