Build a angular-cli project with maven

package.json

{...
  "scripts": {
    "ng": "ng",
    "start": "ng serve --proxy-config proxy.conf.json",
    "clean": "rm -rf dist",
    "build-prod": "yarn install && ng build -prod",
    "build-dev":  "yarn install && ng build -dev",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
 ..}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <artifactId>test</artifactId>
    <groupId>py.com.volpe</groupId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <node.version>v6.9.1</node.version>
        <yarn.version>v0.24.6</yarn.version>
        <frontend-maven-plugin.version>1.4</frontend-maven-plugin.version>
        <environment>prod</environment>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>com.github.eirslett</groupId>
                <artifactId>frontend-maven-plugin</artifactId>
                <version>${frontend-maven-plugin.version}</version>
                <executions>
                    <execution>
                        <id>install node and yarn</id>
                        <goals>
                            <goal>install-node-and-yarn</goal>
                        </goals>
                        <phase>generate-resources</phase>
                    </execution>
                    <execution>
                        <id>yarn install</id>
                        <goals>
                            <goal>yarn</goal>
                        </goals>
                        <phase>compile</phase>
                        <configuration>
                            <arguments>install</arguments>
                        </configuration>
                    </execution>
                    <execution>
                        <id>ng build</id>
                        <goals>
                            <goal>yarn</goal>
                        </goals>
                        <phase>generate-resources</phase>
                        <configuration>
                            <arguments>run build-${environment}</arguments>
                        </configuration>
                    </execution>
                    <execution>
                        <id>ng clean</id>
                        <goals>
                            <goal>yarn</goal>
                        </goals>
                        <phase>clean</phase>
                        <configuration>
                            <arguments>run clean</arguments>
                        </configuration>
                    </execution>
                </executions>
                <configuration>
                    <nodeVersion>${node.version}</nodeVersion>
                    <yarnVersion>${yarn.version}</yarnVersion>
                </configuration>
            </plugin>
          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.1.0</version>
            <configuration>
              <webXml>web.xml</webXml>
              <webResources>
                <resource>
                  <!-- this is relative to the pom.xml directory -->
                  <directory>dist</directory>
                </resource>
              </webResources>
            </configuration>
          </plugin>
          <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.1</version>
                <configuration>
                    <update>true</update>
                    <path>/${project.name}##${project.version}</path>
                </configuration>
            </plugin>
        </plugins>
    </build>



</project>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	metadata-complete="false" version="3.1">

</web-app>

Does mvn clean work here? I have a very similar setup, and it's failing with:

[ERROR] Failed to execute goal com.github.eirslett:frontend-maven-plugin:1.6:yarn (clean node modules) on project my-project: Failed to run task: 'yarn clean' failed. java.io.IOException: Cannot run program "/my-project/target/node/yarn/dist/bin/yarn" (in directory "/my-project"): error=2, No such file or directory -> [Help 1]

Presumably this is because the install node and yarn execution hasn't happened before it runs clean. Or am I doing something stupid?

Why is 'ng build' performed in the 'generate-resources' phase and therefore before the 'yarn install' command in the 'compile' phase?
Shoudn't 'yarn install' be in the 'generate-resources' phase and 'ng build' in the 'compile' phase?