Code change:
<ins> { lib , buildNpmPackage , mkYarnPackage , fetchYarnDeps , fetchFromGitHub , typescript , jq , fetchpatch }: let # Instead of the build script that spectral-language-server provides (ref: https://github.com/luizcorreia/spectral-language-server/blob/master/script/vscode-spectral-build.sh), we build vscode-spectral manually. # This is because the script must go through the network and will not work under the Nix sandbox environment. vscodeSpectral = mkYarnPackage rec { pname = "vscode-spectral"; version = "1.1.2"; src = fetchFromGitHub { owner = "stoplightio"; repo = "vscode-spectral"; rev = "v${version}"; hash = "sha256-TWy+bC6qhTKDY874ORTBbvCIH8ycpmBiU8GLYxBIiAs="; }; packageJSON = ./package.json; offlineCache = fetchYarnDeps { yarnLock = src + "/yarn.lock"; hash = "sha256-am27A9VyFoXuOlgG9mnvNqV3Q7Bi7GJzDqqVFGDVWIA="; }; nativeBuildInputs = [ typescript jq ]; postPatch = '' cp server/tsconfig.json server/tsconfig.json.bak jq '.compilerOptions += {"module": "NodeNext", "moduleResolution": "NodeNext"}' server/tsconfig.json.bak > server/tsconfig.json ''; dontConfigure = true; buildPhase = '' runHook preBuild # FIXME: vscode-spactral depends on @rollup/pluginutils, but it may have a bug that doesn't provide the type definitions for NodeNext module resolution. (ref: https://github.com/rollup/plugins/issues/1192) # tsc detects some type errors in the code. However we ignore this because it's not a problem for the final build if server/dist is generated. tsc -p server || true test -d server/dist runHook postBuild ''; installPhase = '' runHook preInstall mkdir -p $out cp -R server/dist $out runHook postInstall ''; doDist = false; meta = with lib; { homepage = "https://github.com/stoplightio/vscode-spectral"; description = "VS Code extension bringing the awesome Spectral JSON/YAML linter with OpenAPI/AsyncAPI support"; license = licenses.asl20; }; }; in buildNpmPackage rec { pname = "spectral-language-server"; version = "1.0.8-unstable-2023-06-06"; src = fetchFromGitHub { owner = "luizcorreia"; repo = "spectral-language-server"; rev = "c9a7752b08e6bba937ef4f5435902afd41b6957f"; hash = "sha256-VD2aAzlCnJ6mxPUSbNRfMOlslM8kLPqrAI2ah6sX9cU="; }; npmDepsHash = "sha256-ixAXy/rRkyWL3jdAkrXJh1qhWcKIkr5nH/Bhu2JV6k8="; patches = [ # https://github.com/luizcorreia/spectral-language-server/pull/15 (fetchpatch { name = "fix-package-lock.patch"; url = "https://github.com/luizcorreia/spectral-language-server/commit/909704850dd10e7b328fc7d15f8b07cdef88899d.patch"; hash = "sha256-+mN93xP4HCll4dTcnh2W/m9k3XovvgnB6AOmuJpZUZ0="; }) ]; dontNpmBuild = true; npmFlags = [ "--ignore-scripts" ]; installPhase = '' runHook preInstall mkdir -p $out/bin mkdir -p $out/node_modules mkdir -p $out/dist/spectral-language-server cp -R ${vscodeSpectral}/dist/* $out/dist/spectral-language-server/ cp ./bin/* $out/bin cp -R ./node_modules/* $out/node_modules runHook postInstall ''; meta = with lib; { homepage = "https://github.com/luizcorreia/spectral-language-server"; description = "Awesome Spectral JSON/YAML linter with OpenAPI/AsyncAPI support"; maintainers = with maintainers; [ momeemt ]; license = licenses.mit; mainProgram = "spectral-language-server"; }; } </ins>

Related discussion:
text: Awesome Spectral JSON/YAML linter with OpenAPI/AsyncAPI support Spectral is a flexible object linter with out of the box support for OpenAPI v2 and v3, JSON Schema, and AsyncAPI. MIT
Should be trivial to package using .