如何使用maven-exec-plugin for npm clean？

<build>
  <plugins>
    <plugin>
      <groupId>org.codehaus.mojo</groupId>
      <artifactId>exec-maven-plugin</artifactId>
      <version>1.6.0</version>
      <executions>
        <execution>
          <id>clean-npm-dependencies</id>
          <phase>clean</phase>
          <goals>
            <goal>exec</goal>
          </goals>
          <configuration>
            <executable>npm</executable>
            <arguments>
              <argument>clean</argument>
            </arguments>
          </configuration>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>