add a gradle build to build everything into a single file

.babelrc

@@ -0,0 +1,15 @@
+{
+    "presets": [
+        [
+            "@babel/preset-env",
+            {
+                "targets": {
+                    "esmodules": true
+                }
+            }
+        ]
+    ],
+    "plugins": [
+
+    ]
+}

build.gradle

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+plugins {
+	id "com.moowork.node" version "1.3.1"
+	id "com.moowork.gulp" version "1.2.0"
+}
+
+// run npm install and install gulp when building
+gulp_build.dependsOn 'installGulp'
+gulp_build.dependsOn 'npmInstall'
+
+task build() {}
+
+// run gulp build on every build
+build.dependsOn gulp_build
+

gulpfile.js

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+const gulp = require('gulp')
+const concat = require('gulp-concat')
+const babel = require('gulp-babel')
+
+function defaultTask(cb) {
+	cb()
+}
+
+function build(callback) {
+	gulp.src('src/**/*.js', { sourcemaps: true})
+		.pipe(babel())
+		.pipe(concat('bundle.js'))
+		.pipe(gulp.dest('dist/'), { sourcemaps: '.'})
+	callback()
+}
+
+exports.build = build
+exports.default = defaultTask
+

package.json

@@ -0,0 +1,12 @@
+{
+	"name": "spa-demo",
+	"version": "0.0.1",
+	"license": "MIT",
+	"devDependencies": {
+		"@babel/core": "^7.8.0",
+		"@babel/preset-env": "^7.8.0",
+		"gulp": "^4.0.2",
+		"gulp-babel": "^8.0.0",
+		"gulp-concat": "^2.6.1"
+	}
+}