How is the gwt compiler used in javascript?

The GWT compiler is used to translate all the application code written in Java into JavaScript. JRE Emulation library − Google Web Toolkit includes a library that emulates a subset of the Java runtime library. The list includes java.lang, java.lang.annotation, java.math, java.io, java.sql, java.util and java.util.logging
Thereof, how does the GWT compiler work in Java?
At compile time, the GWT compiler performs some syntax checks on the JavaScript inside the method, then generates interface code for converting method arguments and return values properly. As of the GWT 1.5 release, the Java varargs construct is supported. The GWT compiler will translate varargs calls between 2 pieces of Java code.
Just so, is there a JavaScript plugin for GWT project? The GWT developer plugin spans the gap between Java bytecode in the debugger and the browser’s JavaScript. Thanks to the GWT developer plugin, there’s no compiling of code to JavaScript to view it in the browser.
Keeping this in consideration, how is a GWT application described in XML?
GWT applications are described as modules. A module "modulename" is described by a configuration file "modulename.gwt.xml". Each module can define one or more Entry point classes. An entry point is the starting point for a GWT application, similar to the main method in a standard Java program.
One may also ask, are there gwt editors for gwt 2.8?
Sources of the pages of the gwtproject.org website. Ported GWT editors from GWT 2.8.x ready for GWT 2.x & J2CL /GWT 3)

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