The following completions are available in JBang. If they do not open up automatically then do an explicit completion using Alt+Space or ^+Space dependent on your platform.
Basic directive completion
Completion for JBang directives like //JAVA and //DEPS are available at start of comments (//).
Dependency completion
//DEPS has completion of Maven artifacts using JBang/Gradle syntax. You can use fully qualified names or just type a substring of the Group and artifact version to get a list of possible matches from Maven Central.
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