Simple gulp debug transform

gulpfile.js

var gt = require('through-gulp');
//...
gulp.src("...")
  .pipe(/*...*/)
  .pipe(gt(function visitFile(file, enc, cb) {
    console.log("file '" + file.path + "' contents: " + file.contents.toString());
    cb(null, file);
  }, function visitEnd(cb) {
    console.log("No more files");
    cb();
  }))
  .pipe(/*...*/)
  //...
  ;