index.js

const {
    dialogflow
} = require('actions-on-google');
const functions = require('firebase-functions');
const Sentiment = require('sentiment');
const sentiment = new Sentiment();

const app = dialogflow({
    debug: true
});

app.intent('Default Welcome Intent', (conv) => {
    conv.ask(`<speak>Hello, my world!<break time="1s"/>How are you doing today?</speak>`);
});


app.intent("getting-number", (conv, params) => {
    let ssml = `<speak><audio src="https://storage.googleapis.com/screamsss/scream.wav">You know that's not possible. Plz, don't make me feel awkward...</audio></speak>`;
    conv.ask(ssml);
});

app.intent("complimenting", (conv) => {
    let ssml = `<speak><audio src = "https://storage.googleapis.com/yaysound/crowd-yay.wav">Why you're so good to me! ;)</audio></speak>`;
    conv.ask(ssml);
});

app.intent("feel-empathy", (conv) => {
    let mood = conv.query;
    let moodSentiment = sentiment.analyze(mood);
    let day = "";

    if (moodSentiment.score > 2) {
        day = `Wonderful to hear that!`;
    } else if (moodSentiment >= 0 && moodSentiment < 2) {
        day = `I whish I could make you day a little better.`;
    } else {
        day = `I'm so sorry to hear that. Is there anything I can do for you?`;
    }
    conv.ask(day)
});

exports.yourAction = functions.https.onRequest(app);