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?
console.log(
              "Result diff can be found at " + BUILD_DIR + MOZCENTRAL_DIFF_FILE
            );
            done();
          });
      });
  })
);
gulp.task("externaltest", function (done) {
  console.log();
  console.log("### Running test-fixtures.js");
  safeSpawnSync("node", ["external/builder/test-fixtures.js"], {
    stdio: "inherit",
  });
  console.log();
  console.log("### Running test-fixtures_esprima.js");
  safeSpawnSync("node", ["external/builder/test-fixtures_esprima.js"], {
    stdio: "inherit",
  });
  done();
});
gulp.task(
  "npm-test",
  gulp.series(
    gulp.parallel("lint", "externaltest", "unittestcli"),
    "lint-chromium",
    "typestest"
  )
);