增强 Run 函数的命令处理逻辑，如果不传递参数，则默认查找 package.json ，然后转到 use 命令

Author: axetroy

internal/command/run.go

@@ -187,16 +187,34 @@ func RunDirectly(cmd []string) error {
 }
 
 func Run(cmd []string) error {
-	if len(cmd) == 0 {
-		return errors.New("commands is required")
-	}
-
 	cwd, err := os.Getwd()
 
 	if err != nil {
 		return errors.WithStack(err)
 	}
 
+	if len(cmd) == 0 {
+		packageJSONPath := util.LoopUpFile(cwd, "package.json")
+
+		if packageJSONPath != nil {
+			util.Debug("Use node constraint from %s\n", *packageJSONPath)
+
+			constraint, err := node.GetConstraintFromPackageJSON(*packageJSONPath)
+
+			if err != nil {
+				return err
+			}
+
+			if constraint != nil {
+				util.Debug("Use node constraint: %s\n", *constraint)
+				return Use(constraint)
+			}
+
+		} else {
+			return errors.New("commands is required")
+		}
+	}
+
 	packageJSONPath := util.LoopUpFile(cwd, "package.json")
 
 	// If the package.json file is found, then use the node constraint in the package.json to run the command