Running Vert.x (w/ES4X) via Eclipse - vert.x

Question

This question is a follow-up to:
Running Vuetify on Vert.x (w/ES4X)
I would like to be able to run ES4X via Eclipse (instead of NPM). I'm not exactly sure if it's possible or how to wire it in.
Let's say I have the following build.gradle.file
plugins {
id 'java'
id 'application'
id 'com.johnrengleman.shadow' version "5.0.0"
}
sourceCompatibility='1.8'
mainClassName='io.vertx.core.Launcher'
repositories {
mavenCentral()
}
dependencies {
implementation 'io.vertx:vertx-core:3.7.1'
implementation 'io.vertx:vertx-web:3.7.1'
implementation 'io.vertx:vertx-lang-js:3.7.1'
// implementation 'io.reactiverse:es4x:0.8.0'
// implementation 'io.reactiverse:es4x-pm:0.8.0'
}
processResources {
from '/src/main/js'
}
shadowJar {
classifier = 'fat'
manifest {
attributes 'Main-Verticle' : 'index.js'
}
mergeServiceFiles {
include 'META-INF/services/io.vertx.core.spi.VerticleFactory'
}
}
and my src/main/js/index.js looks like the one from the other referenced post:
import { Router, StaticHandler } from '#vertx/web';
const app = Router.router(vertx);
app.get().handler(StaticHandler.create("dist"));
vertx.createHttpServer().requestHandler(app).listen(8080);
If I create an executable jar via shadowJar, I get javax.script.ScriptExceptions due to Nashorn choking on the index.js contents (as expected).
If I uncomment the es4x implementation in the gradle build, I get ClassNotFound exceptions for org.graalvm.polyglot.io.FileSystem
So how would I correctly modify this app to take advantage of ES4X? I guess the equivalent of what the 'es4x init' would do?

Answer 1

Say that you have your es4x application and a package.json, when you execute:
npm install
You will get inside node_modules a few extra folders:
.bin
.lib
In the .bin directory there is a es4x-launcher.jar file you can use to start your application from Eclipse. It will refer to the dependencies which are unpacked to the .lib dir. In order to make things work fine the same JVM you have when running the npm install command should be used in eclipse. Otherwise you might end up missing dependencies. This is the case when running graalvm which will not require graaljs dependencies or when running on jdk8 which will not require jvmci dependencies.