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Thank you for sharing! I just created an issue: https://github.com/adamziel/wordpress-wasm/issues/19
Author here, here's an in-depth writeup on how this works and why it's useful:
https://make.wordpress.org/core/2022/09/23/client-side-webas...
To answer your questions directly:
WebAssembly is the magic sauce that transforms server-side code into client-side code. MySQL unfortunately is not yet supported by WebAssembly, so I applied a plugin that adds SQLite supports to WordPress [0]. The WebAssembly application has its own in-memory filesystem that lives in a specific browser tab and is scraped as soon as you close it.
So – technically it exposes db credentials, and even the entire DB, but that you are the only user of that DB so it's okay.
> What would the backend look like
The only backend is a static file server where the code and the database live. Your browser downloads a copy of the database and allows you to modify it in the current tab, but the updates are never saved back to the server.
