Recently we upgraded to Gulp 4. However, the following things still need to be addressed in some way:

- If a task series is executed with an anonymous function inside it, we'll see `Starting '<anonymous>'` in the output, which isn't that great. We need to either suppress it or use named functions.
- If a task is private, it should be hidden in some way. For example, `gh-pages-prepare` is only used in the public `web` target and should not be used on its own, however currently it shows in the default `gulp` output since it's a regular task. Perhaps we should mark them with an underscore?
cwd: MOZCENTRAL_BASELINE_DIR,
        });
        done();
      });
  })
);
gulp.task(
  "mozcentraldiff",
  gulp.series("mozcentral", "mozcentralbaseline", function (done) {
    console.log();
    console.log("### Creating mozcentral diff");
    
    
    
    
    
    rimraf.sync(MOZCENTRAL_BASELINE_DIR + "*");
    gulp
      .src([BUILD_DIR + "mozcentral/**/*"])
      .pipe(gulp.dest(MOZCENTRAL_BASELINE_DIR))
      .on("end", function () {
        safeSpawnSync("git", ["add", "-A"], { cwd: MOZCENTRAL_BASELINE_DIR });
        const diff = safeSpawnSync(
          "git",
          ["diff", "--binary", "--cached", "--unified=8"],
          { cwd: MOZCENTRAL_BASELINE_DIR }
        ).stdout;
        createStringSource(MOZCENTRAL_DIFF_FILE, diff)
          .pipe(gulp.dest(BUILD_DIR))
          .on("end", function () {