lib/common.js
function readFile(filename, isJSON, stripComments, defaultContents){
        if (grunt.file.exists(filename)){
            var contents = grunt.file.read(filename) ;
                if (isJSON || stripComments)
                    contents = stripJsonComments(contents);
                return isJSON ? JSON.parse( contents ) : contents;
        }
        else
           return defaultContents;
    }
function readFile(filename, isJSON, stripComments, defaultContents){
        if (grunt.file.exists(filename)){
            var contents = grunt.file.read(filename) ;
                if (isJSON || stripComments)
                    contents = stripJsonComments(contents);
                return isJSON ? JSON.parse( contents ) : contents;
        }
        else
           return defaultContents;
    }
readFile(filename, isJSON, stripComments, defaultContents)