combinejs broken with gradle 3.4.1 and later

[ghost]

I have a standard configuration as shown in the tutorial (using gradle-js-plugin 2.14.1) javascript.source { dev { js { srcDir jsSrcDir include ".js" exclude ".min.js" } } prod { js { srcDir jsSrcDir include "*.min.js" } } }

// Specify a collection of files to be combined, then minified and finally GZip compressed. task combinejs(type: com.eriwen.gradle.js.tasks.CombineJsTask) { if (env == 'prod') { source = javascript.source.prod.js.files } else { source = javascript.source.dev.js.files } dest = file("${buildDir}/all.js") }

Works perfectly fine with gradle 3.3. With gradle 3.4.1 or 3.5 it runs into an exception.

:myproject:combineJs FAILED

FAILURE: Build failed with an exception.

• What went wrong: path may not be null or empty string. path='null'

• Try: Run with --info or --debug option to get more log output.

• Exception is: java.lang.IllegalArgumentException: path may not be null or empty string. path='null' at org.gradle.api.internal.file.BaseDirFileResolver.doResolve(BaseDirFileResolver.java:72) at org.gradle.api.internal.file.AbstractFileResolver.resolve(AbstractFileResolver.java:79) at org.gradle.api.internal.file.AbstractFileResolver.resolve(AbstractFileResolver.java:61) at org.gradle.api.internal.file.DefaultFileOperations.file(DefaultFileOperations.java:76) at org.gradle.api.internal.project.DefaultProject.file(DefaultProject.java:738) at org.gradle.api.Project$file$5.call(Unknown Source) at org.gradle.api.Project$file$5.call(Unknown Source) at com.eriwen.gradle.js.tasks.CombineJsTask.getDest(CombineJsTask.groovy:29) at com.eriwen.gradle.js.tasks.CombineJsTask_Decorated.getDest(Unknown Source) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73) at org.gradle.api.internal.project.taskfactory.TaskPropertyInfo$4.create(TaskPropertyInfo.java:99) at org.gradle.util.SingleMessageLogger.whileDisabled(SingleMessageLogger.java:217) at org.gradle.api.internal.project.taskfactory.TaskPropertyInfo.getValue(TaskPropertyInfo.java:97) at org.gradle.api.internal.project.taskfactory.TaskClassValidator$FutureValue.call(TaskClassValidator.java:62) at org.gradle.util.GUtil.uncheckedCall(GUtil.java:402)

[ghost]

Sorry, issue only seemed to exist when upgrading from 3.3. to 3.4.1. After cleaning all caches, combinejs & minifyjs worked fine.