Vscodium can't find extension's data when they are installed using the pkgs.vscode-utils.buildVscodeExtension function

rssaromeo · January 14, 2026, 5:57pm

Unable to read file ‘/home/nyx/.vscode-oss/extensions/rssaromeo.simpledatastorage/package.json’ (Error: Unable to resolve non-existing file ‘/home/nyx/.vscode-oss/extensions/rssaromeo.simpledatastorage/package.json’)

this error happens on the extensions
coopermaruyama.nix-embedded-languages
rssaromeo.4-to-2-formatter
rssaromeo.auto-regex
rssaromeo.simple-auto-formatter
rssaromeo.simpledatastorage

i am able to install extensions from the pkgs.vscode-utils.buildVscodeExtension func but when the extensions get installed vscode can’t find them
for the extension coopermaruyama.nix-embedded-languages the extension appears to be located in a folder at
/home/nyx/.vscode-oss/extensions/coopermaruyama.nix-embedded-languages/source
instead of
/home/nyx/.vscode-oss/extensions/coopermaruyama.nix-embedded-languages/
like where vscode is looking for it at

I’ve tried adding /source to the end of vscodeExtUniqueId but that just moves the /source folder to source/source

my script is located at

github.com/rsa17826/nixconf

home/vscode/conf.nix

21f3bb3de

{
  pkgs,
  uname,
  lib,
  ...
}:
let
  # Helper function to reduce boilerplate
  buildLocalEx =
    {
      name,
      publisher,
      version,
      filename,
    }:
    pkgs.vscode-utils.buildVscodeExtension {
      inherit name version;
      src = ./vsix/${filename};
      vscodeExtName = name;
      vscodeExtPublisher = publisher;

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this is all being tested using vscodium on the unstable branch.