[GUIDE] 2025 installing VSIX of extensions not found by VSCodium (that do not offer VSIX's)

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[GUIDE] 2025 installing VSIX of extensions not found by VSCodium (that do not offer VSIX's)

Intro

Hello, today I was attempting to get SQL Syntax highlighting in Python for VSCodium.

The extension I found had no VSIX packaged, and did not show in VSCodium.

After figuring it out I'm here to give you steps on HOW.

The How

Steps for VSCodium on Linux:

1. Navigate to https://marketplace.visualstudio.com (or wherever else)
2. Search for your extension
3. Click on Repository (a github link)
4. Download your extensions zip file myextension.zip (or using git clone it)
5. Extract if using zip, ~/Downloads/myextension
6. Open terminal if you aren't already using it
7. Download and install nvm:
8. 1. curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash
9. Download and install Node.js: nvm install 22
10. cd into your folder containing the extension EG ~/Downloads/myextension/
11. install any requirements using npm here (mine required npm install webpack, yes for production)
12. run vsce package (it will use the current path)
13. This generates the vsix and then from codiums terminal you should be able to run codium --install-extension ~/Downloads/myextension/myextension.vsix

Disclaimer:

Installing extensions this way can be risky as you are manually packaging some randoms code and putting it into a program to run. Depending on the extensions popularity it may be safer if more popular since there are more eyes on it but its not guaranteed.