Packages 
Package Description
com.google.debugging.sourcemap
Provides utilities to the creation and use of source maps.
com.google.debugging.sourcemap.proto  
com.google.javascript.jscomp
Provides the core compiler and its public API.
com.google.javascript.jscomp.ant  
com.google.javascript.jscomp.deps
Analyzes information about dependencies between files.
com.google.javascript.jscomp.graph
Provides graph data structures and algorithms for coloring and fixed-point computations.
com.google.javascript.jscomp.jsonml
Provides the classes to support JsonML format and secure compiler.
com.google.javascript.jscomp.parsing
Provides utilities to help with parsing JSDoc annotations and performing AST transformations.
com.google.javascript.jscomp.regex  
com.google.javascript.jscomp.testing  
com.google.javascript.jscomp.type
Provides type-checking data structures and algorithms.
com.google.javascript.rhino
The core AST from Rhino.
com.google.javascript.rhino.jstype
Provides abstractions to represent types in JavaScript.
com.google.javascript.rhino.testing