zooltd commented on a change in pull request #51:
URL: https://github.com/apache/skywalking-eyes/pull/51#discussion_r681433877



##########
File path: pkg/deps/npm.go
##########
@@ -141,79 +119,132 @@ func (resolver *NpmResolver) NeedSkipInstallPkgs() bool {
 }
 
 // InstallPkgs runs command 'npm install' to install node packages
-func (resolver *NpmResolver) InstallPkgs(root string) error {
+func (resolver *NpmResolver) InstallPkgs() {
        cmd := exec.Command("npm", "install")
-       cmd.Dir = root
        logger.Log.Println(fmt.Sprintf("Run command: %v, please wait", 
cmd.String()))
        cmd.Stdout = os.Stdout
        cmd.Stderr = os.Stderr
+       // Error occurs all the time in npm commands, so no return statement 
here
        if err := cmd.Run(); err != nil {
-               return err
+               logger.Log.Errorln(err)
        }
-       return nil
 }
 
-// ResolvePackageLicense resolves the licenses of the given packages.
-func (resolver *NpmResolver) ResolvePackageLicense(depName string, report 
*Report) error {
-       depFiles, err := ioutil.ReadDir(depName)
+// ListPkgPaths runs npm command to list all the production only packages' 
absolute paths, one path per line
+// Note that although the flag `--long` can show more information line like a 
package's name,
+// its realization and printing format is not uniform in different npm-cli 
versions
+func (resolver *NpmResolver) ListPkgPaths() (io.Reader, error) {
+       buffer := &bytes.Buffer{}
+       cmd := exec.Command("npm", "ls", "--all", "--production", "--parseable")
+       cmd.Stderr = os.Stderr
+       cmd.Stdout = buffer
+       // Error occurs all the time in npm commands, so no return statement 
here
+       err := cmd.Run()
+       return buffer, err

Review comment:
       the error returned from `cmd.Run()` is exist error, like `exit status 1`
   it differs from `Stderr` , which records runtime error
   so the same error will not be printed twice




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