fix(npm): better detect workspace packages (#25692)

lib/modules/manager/npm/post-update/npm.spec.ts

@@ -459,6 +459,17 @@ describe('modules/manager/npm/post-update/npm', () => {
           workspacesPackages: ['docs/*', 'web/*'],
         },
       },
+      {
+        packageFile: 'some-missing-dir/docs/a/package.json',
+        packageName: 'hello',
+        depType: 'dependencies',
+        newVersion: '1.1.1',
+        newValue: '^1.0.0',
+        isLockfileUpdate: true,
+        managerData: {
+          workspacesPackages: ['docs/*', 'web/*'],
+        },
+      },
     ];
 
     it('workspace in sub-folder', async () => {

lib/modules/manager/npm/post-update/npm.ts

@@ -265,19 +265,29 @@ export function divideWorkspaceAndRootDeps(
         // stop when the first match is found and
         // add workspaceDir to workspaces set and upgrade object
         for (const workspacePattern of workspacePatterns) {
-          if (minimatch(workspacePattern).match(workspaceDir)) {
+          const massagedPattern = (workspacePattern as string).replace(
+            /^\.\//,
+            '',
+          );
+          if (minimatch(massagedPattern).match(workspaceDir)) {
             workspaceName = workspaceDir;
             break;
           }
         }
+        if (workspaceName) {
           if (
-          workspaceName &&
             !rootDeps.has(upgrade.managerData.packageKey) // prevent same dep from existing in root and workspace
           ) {
             workspaces.add(workspaceName);
             upgrade.workspace = workspaceName;
             lockWorkspacesUpdates.push(upgrade);
           }
+        } else {
+          logger.warn(
+            { workspacePatterns, workspaceDir },
+            'workspaceDir not found',
+          );
+        }
         continue;
       }
     }