fix: normalize npm prefix paths

Signed-off-by: Ruben Romero Montes <rromerom@redhat.com>

Author: ruromero

src/main/java/com/redhat/exhort/providers/JavaScriptNpmProvider.java

@@ -15,9 +15,10 @@
  */
 package com.redhat.exhort.providers;
 
+import java.nio.file.Path;
+
 import com.redhat.exhort.tools.Ecosystem;
 import com.redhat.exhort.tools.Operations;
-import java.nio.file.Path;
 
 /**
  * Concrete implementation of the {@link JavaScriptProvider} used for converting dependency trees
@@ -37,10 +38,22 @@ protected String lockFileName() {
     return LOCK_FILE;
   }
 
+  /**
+   * Helper method to normalize paths for npm on Windows.
+   * npm's --prefix option has issues with Windows backslash paths.
+   */
+  private String normalizePath(Path path) {
+    if (Operations.isWindows()) {
+      // Convert Windows backslashes to forward slashes for npm
+      return path.toString().replace('\\', '/');
+    }
+    return path.toString();
+  }
+
   @Override
   protected String[] updateLockFileCmd(Path manifestDir) {
     return new String[] {
-      packageManager(), "i", "--package-lock-only", "--prefix", manifestDir.toString()
+      packageManager(), "i", "--package-lock-only", "--prefix", normalizePath(manifestDir)
     };
   }
 
@@ -55,7 +68,7 @@ protected String[] listDepsCmd(boolean includeTransitive, Path manifestDir) {
         "--package-lock-only",
         "--json",
         "--prefix",
-        manifestDir.toString()
+        normalizePath(manifestDir)
       };
     }
     return new String[] {