I ended up with. This is places inside the nixflk repos → overlays/vscode.nix
final: prev:
let
vscode-insider = prev.vscode.override {
isInsiders = true;
};
in
{
vscode = vscode-insider.overrideAttrs (oldAttrs: rec {
src = (builtins.fetchTarball {
url = "https://update.code.visualstudio.com/latest/linux-x64/insider";
sha256 = "03nmmcr8canxnhxpsd2d5rfqi6d7njab4c3bpcqmfi9xbk3scx1a";
});
version = "latest";
});
}