Assests folder use under Firebase Cloud Function project - firebase

Question

I'd like to have an assets folder (and maybe it also has in terms some subfolders) under functions folder which contains several image files. Depending on database action I'd like to copy some or all contents of that assets folder (or one of its subfolder) to Firebase Storage location designated with that particular db action. (or under temp folder for editing prior to sending them to Cloud Storage location)
Is this possible? I can't find any relevant information.
I know I can put those assets under Firebase Storage in the first place, I just want to keep them under functions in terms of keeping my project structure clean. Also, any operation in Cloud Function area of Storage is per file, no bulk folder ops.
UPDATE:
Indeed it is possible, one needs to use correct file/folder location in Cloud Functions while using a custom sub-folder. I'll write an answer later when I'll have free time.

Answer 1

You can indeed deploy an assets folder along with your function code. For example, consider the following directory structure:
functions
│ index.js
│ package.json
│
└───assets
│ file_1.png
│ file_2.png
│
└───subfolder1
│ file_3.png
│ file_4.png
│ ...
Running the firebase deploy ... command within the functions folder will deploy the whole tree. Then, from your exported function in index.json, you'll be able to access your assets folder content like you'd usually do in Nodejs.
One thing to take into account with this approach though is that there are resource limits applied to Cloud Functions, specifically on deployment size:
Depending on the size of your picture this may be a problem. And note that, even if the total size is within the limits, the bigger it is the longer it will take to deploy when scaling up.

Answer 2

I tried the above solution but falied
you can convert your files in base64 and top of your function you can convert the bas64 file to your files and save it in os.tmpdir() and use it anywhere in your function.
Here is the example of how I put my font in cloud functions for later use
function writeFontsInTempDir() {
const banglaFont = 'Your base64'
fs.writeFileSync(path.join(os.tmpdir(), 'bangla_font.ttf'), banglaFont, {encoding: 'base64'});
const englishFont= 'Your base64'
fs.writeFileSync(path.join(os.tmpdir(), 'english_font.ttf'), englishFont, {encoding: 'base64'});
}
for later use, you can just call
const bangla_font_path = path.join(os.tmpdir(), 'bangla_font.ttf');
const english_font_path = path.join(os.tmpdir(), 'english_font.ttf');
You will need these imports
import * as os from 'os';
import * as path from 'path';