[FR] Assembly is missing from the code block dropdown and fails to render syntax highlighting

[eswar-7116]

Bug Description

I noticed a bug where Assembly doesn't show up in the code block language dropdown menu at all, and it completely fails to render syntax highlighting.

How to Reproduce

1. Open AppFlowy (Web or Desktop).
2. Create a new code block component.
3. Click the language dropdown menu.
4. Search for "Assembly" (it is not in the list).

Expected Behavior

"Assembly" should be an available option in the language dropdown menu and should correctly apply syntax highlighting to the code block when selected across all platforms.

Operating System

Cross-platform (Issue spans both Desktop and Web builds)

AppFlowy Version(s)

Latest Web distribution (tested on May 16, 2026)

Screenshots

No response

Additional Context

I have tried to fix this. I've checked the AppFlowy-Plugins repo to understand the implementation. I found it was a naming issue where the filtering logic drops the language. Since it looked like a literal value change, I submitted a PR directly without setting up a full local test environment.

However, when checking the web distribution, I found that prism.js is actively being loaded in the browser sources. This completely complicates the fix. highlight.dart requires the token x86asm and prism.js which doesn't recognize x86asm and expects nasm instead.

To verify, I tested the x86asm value directly in the web client by overriding the detectedLanguage variable in the editor file from the source.

• Setting the variable to a standard language like bash worked perfectly.
• Setting the variable to x86asm failed completely (no syntax highlighting rendered).
• Setting the variable to nasm worked because prism.js expects nasm and not x86asm.

Question: Since the web client uses 2 libraries for syntax highlighting, does the web build require additional configuration or updates to support Assembly alongside my PR?

Link to the PR I made in AppFlowy-Plugins repo: #34