This project more or less consists of the bits of closure that are required in a j2cl-based app,
plus the various parts of j2cl's js bootstrap that are not yet included in the jre.js.zip, like
jre.js, primitives, nativebootstrap, and and vmbootstrap.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window bootstrap-0.11.0-9336533b6.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
