imrpove nodejs discovery

- use dream-lock transaltor for packages without any dependencies
- scan sub-directories of non-project dirs

src/discoverers/nodejs/default.nix

@@ -20,9 +20,16 @@ let
   getTranslatorNames = path:
     let
       nodes = l.readDir path;
+      packageJson = l.fromJSON (l.readFile "${path}/package.json");
     in
       l.optionals (nodes ? "package-lock.json") [ "package-lock" ]
       ++ l.optionals (nodes ? "yarn.lock") [ "yarn-lock" ]
+      # if the package has no dependencies we use the
+      # package-lock translator with `packageLock = null`
+      ++ l.optionals
+        (! packageJson ? dependencies
+            && ! packageJson ? devDependencies)
+        [ "package-lock" ]
       ++ [ "package-json" ];
 
   # returns the parsed package.json of a given directory
@@ -78,12 +85,21 @@ let
       # twice.
       alreadyDiscovered ? {},
     }:
+    let
+      foundSubProjects = alreadyDiscovered:
+        l.flatten
+          ((l.mapAttrsToList
+            (dname: dir: discoverInternal {
+              inherit alreadyDiscovered;
+              tree = dir;
+            })
+            (tree.directories or {})));
+    in
     # skip if not a nodajs project
     if alreadyDiscovered ? "${tree.relPath}"
-        || ! tree ? files."package.json"
-    then
+        || ! tree ? files."package.json" then
       # this will be cleaned by `flatten` for sub-directories
-      []
+      foundSubProjects alreadyDiscovered
     else
       let
 
@@ -130,13 +146,7 @@ let
         # Thanks to `alreadyDiscovered`, workspace projects won't be discovered
         # a second time.
         ++
-        l.flatten
-          ((l.mapAttrsToList
-            (dname: dir: discoverInternal {
-              alreadyDiscovered = alreadyDiscovered';
-              tree = dir;
-            })
-            (tree.directories or {})));
+        (foundSubProjects alreadyDiscovered');
 in
 
 {

src/translators/nodejs/pure/package-lock/default.nix

@@ -53,13 +53,23 @@ let
       getPackageLock = project:
         let
           # returns the parsed package-lock.json for a given project
-          fileRelPath =
+          dirRelPath =
             if project ? subsystemInfo.workspaceParent then
-              "${project.subsystemInfo.workspaceParent}/package-lock.json"
+              "${project.subsystemInfo.workspaceParent}"
             else
-              "${project.relPath}/package-lock.json";
+              "${project.relPath}";
+
+          packageJson =
+            (tree.getNodeFromPath "${dirRelPath}/package.json").jsonContent;
+
+          hasNoDependencies =
+            ! packageJson ? dependencies && ! packageJson ? devDependenices;
+
         in
-          (tree.getNodeFromPath fileRelPath).jsonContent;
+          if hasNoDependencies then
+            null
+          else
+            (tree.getNodeFromPath "${dirRelPath}/package-lock.json").jsonContent;
 
       getPackageJson = project:
         let
@@ -110,7 +120,11 @@ let
 
       dev = ! noDev;
 
-      parsed = packageLock;
+      packageLockDeps =
+        if packageLock == null then
+          {}
+        else
+          packageLock.dependencies or {};
 
       workspacePackageJson =
         l.genAttrs
@@ -126,8 +140,7 @@ let
               json.version)
           workspacePackageJson;
 
-      rootDependencies =
-        packageLock.dependencies or {};
+      rootDependencies = packageLockDeps;
 
       packageJsonDeps =
         packageJson.dependencies or {} // packageJson.devDependencies or {};
@@ -135,7 +148,7 @@ let
       parsedDependencies =
         l.filterAttrs
           (name: dep: packageJsonDeps ? "${name}")
-          parsed.dependencies or {};
+          packageLockDeps;
 
       identifyGitSource = dependencyObject:
         # TODO: when integrity is there, and git url is github then use tarball instead
@@ -223,7 +236,7 @@ let
             ));
 
         packages =
-          { "${defaultPackage}" = parsed.version or "unknown"; }
+          { "${defaultPackage}" = packageJson.version or "unknown"; }
           // workspacePackages;
 
         mainPackageDependencies =