The .mext file for my Weather+ Extension on mBlock.
You can download it and open it in https://ext.mblock.cc/
You can edit the code there. (Don't steal my API key :D). The code is in async JavaScript syntax, which is a bit complicated...
For more of a tutorial about uploading this extension to mBlock, see my other extension: https://github.com/The-Best-Codes/upload-mode-broadcast-mblock#readme
Thanks for viewing!