Exclude debug JavaScript code during minification

Question

I\'m looking into different ways to minify my JavaScript code including the regular JSMin, Packer, and YUI solutions. I\'m really interested in the new Google Closure Compil

Answer 1

Even though its an old question. I stumbled upon the same issue today and found that it can be achieved using CompilerOptions.

I followed this thread.

We run the compiler, from Java, on our server before sending the code to the client. This worked for us in Simple mode.

private String compressWithClosureCompiler(final String code) {
    final Compiler compiler = new Compiler();
    final CompilerOptions options = new CompilerOptions();
    Logger.getLogger("com.google.javascript.jscomp").setLevel(Level.OFF);
    if (compressRemovesLogging) {
        options.stripNamePrefixes = ImmutableSet.of("logger");
        options.stripNameSuffixes = ImmutableSet.of("debug", "dev", "info", "error",
                "warn", "startClock", "stopClock", "dir");
    }
    CompilationLevel.SIMPLE_OPTIMIZATIONS.setOptionsForCompilationLevel(options);

    final JSSourceFile extern = JSSourceFile.fromCode("externs.js", "");
    final JSSourceFile input = JSSourceFile.fromCode("input.js", code);
    compiler.compile(extern, input, options);
    return compiler.toSource();
}

It will remove all the calls to logger.debug, logger.dev...etc.etc