Using Firebase Functions to create and upload a text file to Firebase Storage using Node and firebase-admin

exportToFile.ts

import * as path from 'path';
import * as os from 'os';
import * as fs from 'fs';

import * as admin from 'firebase-admin';

const exportToFile = async (req, _, next) => {
  try {
    const fileName = 'test002.csv';
    const tempFilePath = path.join(os.tmpdir(), fileName);
    console.log({tempFilePath});
    const content = 'id,firstname,lastname\n1,John,Doe\n2,Jane,Doe';
    await fs.writeFileSync(tempFilePath, content);

    var bucket = await admin.storage().bucket();

    bucket.upload(tempFilePath, {
      destination: `exports/${fileName}`,
    });

    next();
  } catch (err) {
    console.error('middlewares > exportToFile', err);
    next();
  };
};

export default exportToFile;

await admin.storage().bucket();

Actually, you don't need to await because it's not a promise. Same for fs.writeFileSync