Google cloud storage problem

checkFiles.ts

import {chunk} from 'lodash';
import * as admin from "firebase-admin";
import * as storage from '@google-cloud/storage';

const gcs = storage();
//https://github.com/GoogleCloudPlatform/google-cloud-node/issues/2254
gcs.interceptors.push({
    request: function(reqOpts) {
        reqOpts.forever = false;
        return reqOpts
    }
});
const ENV = process.env.ENV || "dev";
// Fetch the service account key JSON file contents
const serviceAccount = require(`../../../xxxx.json`);
// Initialize the app with a service account, granting admin privileges
admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: `https://${serviceAccount.project_id}.firebaseio.com/`
});

const bucket = gcs.bucket('xxxx');


const checkFileExists = (fileName) =>
    bucket.file(fileName).exists()
        .then(([exists]) => exists || fileName)
        .catch((error) => {
            console.error('Error checking ', fileName);
            console.error(error);
            return `error: ${fileName}`;
        });


(async () => {
    
    const data = admin.database().ref('some_collection');
    const snapshot = await data.once('value');
    const checkPromises = [];
    snapshot.forEach((data) => {
        const cloth = data.val();
        const id = cloth.id;

        checkPromises.push(checkFileExists(`optimized_png/${id}.png`));
        checkPromises.push(checkFileExists(`optimized/${id}.webp`));
        checkPromises.push(checkFileExists(`optimized/${id}@2x.webp`));
        checkPromises.push(checkFileExists(`optimized/${id}@3x.webp`));


    });
    const chunks = chunk(checkPromises, 20);
    let i = 1;
    let results = [];
    for (const chunk of chunks) {
        const chunkResults = await Promise.all(chunk);
        results = results.concat(chunkResults);
        i++;
    }
    const missing = results.filter((exists) => exists !== true);
    if (missing.length > 0) {
        console.log('Missing: \n');
        missing.forEach((file, i) => console.log(`${i}: ${file}`));
        process.exit(1);
    }
    console.log('YAY!');
    process.exit(0);
})();