The language tools (compiler, etc.) are all open source and written in Fan. The code is clean and surprisingly readable. As to IDE support, there is currently a plugin for JetBrains IDEA and one ...

A Java compiler is a program that takes the text file work of a developer and compiles it into a platform-independent Java file. Java compilers include the Java Programming Language Compiler (javac), ...

Because GraalVM is the first compiler of its kind written completely in Java—a memory-safe language designed for productivity—unlike other compilers, it’s easy for developers to read and modify.