Node.js: Difference between revisions

@@ Line 272: / Line 272: @@
 v16.17.1
 </pre>
+=== Override NodeJS package ===
+Overriding a Nix package which is based on ''buildNpmPackage'' can be challeging because not only the source hash has to get changed but sometimes also the ''package-lock.json'' file and the ''npmDepsHash''.
+Unfortunately it is not possible to directly access and change ''npmDepsHash'' inside ''overrideAttrs'', so this is an example workaround for changing the version, ''package-lock.json'' and hashes of the package ''eslint'':<syntaxhighlight lang="nix">
+environment.systemPackages = [
+  (eslint.overrideAttrs (oldAttrs: rec {
+    version = "8.57.0";
+    src = fetchFromGitHub {
+      owner = "eslint";
+      repo = "eslint";
+      rev = "refs/tags/v${version}";
+      hash = "sha256-nXlS+k8FiN7rbxhMmRPb3OplHpl+8fWdn1nY0cjL75c=";
+    };
+    postPatch = ''
+      cp ${./package-lock.json} package-lock.json
+    '';
+    npmDepsHash = "sha256-DiXgAD0PvIIBxPAsdU8OOJIyvYI0JyPqu6sj7XN94hE=";
+    npmDeps = pkgs.fetchNpmDeps {
+      src = lib.fileset.toSource {
+        root = ./.;
+        fileset = lib.fileset.unions [
+          ./package-lock.json
+          ./package.json
+        ];
+      };
+      name = "eslint-${version}-npm-deps";
+      hash = npmDepsHash;
+    };
+  }))
+];
+</syntaxhighlight>
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