transpile/minify javascript

build.gradle

@@ -2,6 +2,7 @@ plugins {
     id 'org.springframework.boot' version '2.3.0.RELEASE'
     id 'com.github.node-gradle.node' version '2.2.4'
     id 'io.miret.etienne.sass' version '1.1.1'
+    id "com.leobia.gradle.jsgradlecompiler" version "0.3.0"
 }
 
 apply plugin: 'java'
@@ -60,6 +61,7 @@ node {
 // npm install should be run before processResources
 processResources.dependsOn npmInstall
 processResources.dependsOn compileSass
+processResources.dependsOn compileJs
 
 // copy static files to web application
 processResources {
@@ -81,6 +83,19 @@ processResources {
     from ("${buildDir}/sass/") {
         into 'static/css'
     }
+    from ("${buildDir}/js/") {
+        into 'static/js'
+    }
+}
+
+jsOptions {  
+  inputPath = file("./src/main/resources/static/js/")  
+  outputPath = file("${buildDir}/js/")  
+  compilationLevel = "SIMPLE_OPTIMIZATIONS"  
+  jsVersionIn = 'ECMASCRIPT_2020'  
+  jsVersionOut = 'ECMASCRIPT5'  
+  combineAllFiles = false
+  keepSameName = false  
 }
 
 test {

src/main/webapp/WEB-INF/jsp/advancedsearch.jsp

@@ -108,6 +108,6 @@
 
 </form>
 
-<script src="/js/advanced-search.js"></script>
+<script src="/js/advanced-search.min.js"></script>
 
-<%@ include file="base/foot.jsp" %>
\ No newline at end of file
+<%@ include file="base/foot.jsp" %>

src/main/webapp/WEB-INF/jsp/base/foot.jsp

@@ -41,7 +41,7 @@
   </footer>
 
   <script src="/js/jquery.min.js"></script>
-  <script src="/js/theme.js"></script>
+  <script src="/js/theme.min.js"></script>
 
 </div>
 </body>

src/main/webapp/WEB-INF/jsp/basket.jsp

@@ -6,7 +6,7 @@
 
 <%@ include file="base/head.jsp" %>
 
-<script type="text/javascript" src="/js/basket.js"></script>
+<script type="text/javascript" src="/js/basket.min.js"></script>
 
 <span hidden="true" id="basketItemString" data-value="${basketItemString}"></span>