re: https://github.com/alex-seville/blanket/issues/469

es6-blanket-loader.js

var fs = require("fs"),
    path = require("path");

module.exports = function(blanket){
    var traceur = require("traceur");
    var oldLoaderJS = require.extensions['.js'];

    require.extensions['.js'] = function(localModule, filename) {

        var pattern = blanket.options("filter");
        filename = blanket.normalizeBackslashes(filename);
        if (blanket.matchPattern(filename,pattern)){

            var content = fs.readFileSync(filename, 'utf8');
            content = traceur.compile(content, {});
            blanket.instrument({
                inputFile: content,
                inputFileName: filename
            },function(instrumented){
                var baseDirPath = blanket.normalizeBackslashes(path.dirname(filename))+'/.';
                try{
                    instrumented = instrumented.replace(/require\s*\(\s*("|')\./g,'require($1'+baseDirPath);
                    localModule._compile(instrumented, filename);
                }
                catch(err){
                    console.log("Error parsing instrumented code: "+err);
                }
            });
        }else{
            oldLoaderJS(localModule,filename);
        }
    };
};