Fix mempool package: remove fetchNodeModules dependency

Replace fetchNodeModules (nix-bitcoin specific) with standard npm ci approach.
The package-lock.json files in the mempool repo will be used directly.

packages/mempool/default.nix

@@ -3,22 +3,18 @@
 , nodejs_22
 , nodejs-slim_22
 , fetchFromGitHub
-, fetchNodeModules
 , runCommand
 , makeWrapper
 , curl
 , cacert
 , rsync
-# for rust-gbt (backend module)
 , cargo
 , rustc
 , rustPlatform
 , napi-rs-cli
 }:
-rec {
-  nodejs = nodejs_22;
-  nodejsRuntime = nodejs-slim_22;
 
+let
   version = "3.2.1";
 
   src = fetchFromGitHub {
@@ -28,105 +24,22 @@ rec {
     hash = "sha256-O2XPD1/BXQnzuOP/vMVyRfmFZEgjA85r+PShWne0vqU=";
   };
 
-  nodeModules = {
+  frontendAssets = stdenvNoCC.mkDerivation {
-    frontend = fetchNodeModules {
-      inherit src nodejs;
-      sourceRoot = "source/frontend";
-      hash = "sha256-+jfgsAkDdYvgso8uSHaBj/sQL3fC/ABQWzVTXfdZcU0=";
-    };
-    backend = fetchNodeModules {
-      inherit src nodejs;
-      sourceRoot = "source/backend";
-      hash = "sha256-y5l2SYZYK9SKSy6g0+mtTWD6JFkkdQHHBboECpEvWZ4=";
-    };
-  };
-
-  frontendAssets = fetchFiles {
     name = "mempool-frontend-assets";
-    hash = "sha256-r6GfOY8Pdh15o2OQMk8syfvWMV6WMCReToAEkQm7tqQ=";
+    outputHashMode = "recursive";
-    fetcher = ./frontend-assets-fetch.sh;
+    outputHashAlgo = "sha256";
-  };
+    outputHash = "sha256-r6GfOY8Pdh15o2OQMk8syfvWMV6WMCReToAEkQm7tqQ=";
-
+    nativeBuildInputs = [ curl cacert ];
-  mempool-backend = mkDerivationMempool {
+    buildCommand = ''
-    pname = "mempool-backend";
+      mkdir $out
-
+      cd $out
-    patches = [ ./0001-allow-disabling-mining-pool-fetching.patch ];
+      ${builtins.readFile ./frontend-assets-fetch.sh}
-
-    buildPhase = ''
-      cd backend
-      ${sync} --chmod=+w ${nodeModules.backend}/lib/node_modules .
-      patchShebangs node_modules
-
-      ${sync} ${mempool-rust-gbt}/ rust-gbt
-      npm run package
-
-      runHook postBuild
     '';
-
-    installPhase = ''
-      mkdir -p $out/lib/mempool-backend
-      ${sync} package/ $out/lib/mempool-backend
-
-      makeWrapper ${nodejsRuntime}/bin/node $out/bin/mempool-backend \
-        --add-flags $out/lib/mempool-backend/index.js
-
-      runHook postInstall
-    '';
-
-    passthru = {
-      inherit nodejs nodejsRuntime;
-      nodeModules = nodeModules.backend;
-    };
-  };
-
-  mempool-frontend = mkFrontend {};
-
-  # Argument `config` (type: attrset) defines the mempool frontend config.
-  # If `{}`, the default config is used.
-  # See here for available options:
-  # https://github.com/mempool/mempool/blob/master/frontend/src/app/services/state.service.ts
-  # (`interface Env` and `defaultEnv`)
-  mkFrontend = config: mkDerivationMempool {
-    pname = "mempool-frontend";
-
-    buildPhase = ''
-      cd frontend
-
-      ${sync} --chmod=+w ${nodeModules.frontend}/lib/node_modules .
-      patchShebangs node_modules
-
-      # sync-assets.js is called during `npm run build` and downloads assets from the
-      # internet. Disable this script and instead add the assets manually after building.
-      : > sync-assets.js
-
-      ${lib.optionalString (config != {}) ''
-        ln -s ${builtins.toFile "mempool-frontend-config" (builtins.toJSON config)} mempool-frontend-config.json
-      ''}
-
-      npm run build
-
-      # Add assets that would otherwise be downloaded by sync-assets.js
-      ${sync} ${frontendAssets}/ dist/mempool/browser/resources
-
-      runHook postBuild
-    '';
-
-    installPhase = ''
-      ${sync} dist/mempool/browser/ $out
-
-      runHook postInstall
-    '';
-
-    passthru = {
-      withConfig = mkFrontend;
-      assets = frontendAssets;
-      nodeModules = nodeModules.frontend;
-    };
   };
 
   mempool-rust-gbt = stdenvNoCC.mkDerivation rec {
     pname = "mempool-rust-gbt";
-    inherit version src meta;
+    inherit version src;
 
     sourceRoot = "source/rust/gbt";
 
@@ -159,37 +72,18 @@ rec {
     passthru = { inherit cargoDeps; };
   };
 
-  mempool-nginx-conf = runCommand "mempool-nginx-conf" {} ''
-    ${sync} --chmod=u+w ${./nginx-conf}/ $out
-    ${sync} ${src}/production/nginx/http-language.conf $out
-  '';
-
   sync = "${rsync}/bin/rsync -a --inplace";
 
   mkDerivationMempool = args: stdenvNoCC.mkDerivation ({
-    inherit version src meta;
+    inherit version src;
 
     nativeBuildInputs = [
       makeWrapper
-      nodejs
+      nodejs_22
       rsync
     ];
 
     phases = "unpackPhase patchPhase buildPhase installPhase";
-  } // args);
-
-  fetchFiles = { name, hash, fetcher }: stdenvNoCC.mkDerivation {
-    inherit name;
-    outputHashMode = "recursive";
-    outputHashAlgo = "sha256";
-    outputHash = hash;
-    nativeBuildInputs = [ curl cacert ];
-    buildCommand = ''
-      mkdir $out
-      cd $out
-      ${builtins.readFile fetcher}
-    '';
-  };
 
     meta = with lib; {
       description = "Bitcoin blockchain and mempool explorer";
@@ -198,4 +92,86 @@ rec {
       maintainers = with maintainers; [ erikarvstedt ];
       platforms = platforms.unix;
     };
+  } // args);
+
+in rec {
+  mempool-backend = mkDerivationMempool {
+    pname = "mempool-backend";
+
+    patches = [ ./0001-allow-disabling-mining-pool-fetching.patch ];
+
+    buildPhase = ''
+      cd backend
+      # Install dependencies using npm ci (requires package-lock.json)
+      npm ci --legacy-peer-deps --ignore-scripts
+      patchShebangs node_modules
+
+      ${sync} ${mempool-rust-gbt}/ rust-gbt
+      npm run package
+
+      runHook postBuild
+    '';
+
+    installPhase = ''
+      mkdir -p $out/lib/mempool-backend
+      ${sync} package/ $out/lib/mempool-backend
+
+      makeWrapper ${nodejs-slim_22}/bin/node $out/bin/mempool-backend \
+        --add-flags $out/lib/mempool-backend/index.js
+
+      runHook postInstall
+    '';
+
+    passthru = {
+      nodejs = nodejs_22;
+      nodejsRuntime = nodejs-slim_22;
+    };
+  };
+
+  mempool-frontend = mkFrontend {};
+
+  # Argument `config` (type: attrset) defines the mempool frontend config.
+  # If `{}`, the default config is used.
+  mkFrontend = config: mkDerivationMempool {
+    pname = "mempool-frontend";
+
+    buildPhase = ''
+      cd frontend
+
+      # Install dependencies using npm ci (requires package-lock.json)
+      npm ci --legacy-peer-deps --ignore-scripts
+      patchShebangs node_modules
+
+      # sync-assets.js is called during `npm run build` and downloads assets from the
+      # internet. Disable this script and instead add the assets manually after building.
+      : > sync-assets.js
+
+      ${lib.optionalString (config != {}) ''
+        ln -s ${builtins.toFile "mempool-frontend-config" (builtins.toJSON config)} mempool-frontend-config.json
+      ''}
+
+      npm run build
+
+      # Add assets that would otherwise be downloaded by sync-assets.js
+      ${sync} ${frontendAssets}/ dist/mempool/browser/resources
+
+      runHook postBuild
+    '';
+
+    installPhase = ''
+      ${sync} dist/mempool/browser/ $out
+
+      runHook postInstall
+    '';
+
+    passthru = {
+      withConfig = mkFrontend;
+      assets = frontendAssets;
+    };
+  };
+
+  mempool-nginx-conf = runCommand "mempool-nginx-conf" {} ''
+    ${sync} --chmod=u+w ${./nginx-conf}/ $out
+    ${sync} ${src}/production/nginx/http-language.conf $out
+  '';
 }