gulpfile.js

var gulp = require("gulp");
var exec = require("child_process").exec;
var execSync = require("child_process").execSync;
var livereload = require("gulp-livereload");
var gulpif = require("gulp-if");
var uglify = require("gulp-uglify");

var IS_PRODUCTION = process.env.NODE_ENV == "production";

gulp.task("rebuild_texts", function() {
  execSync("node validate.js");
});

gulp.task("validate", function() {
  livereload.listen();
  gulp.watch("validate.js", ["rebuild_texts"]);
  gulp.watch("text.yml", ["rebuild_texts"]);
});

gulp.task("javascripts", function() {
  return gulp
    .src("assets/javascripts/*.js")
    .pipe(gulpif(IS_PRODUCTION, uglify()))
    .pipe(gulp.dest("public/assets/javascripts"))
    .pipe(livereload());
});

gulp.task("watch", function() {
  livereload.listen();
  gulp.watch("assets/javascripts/*.js", gulp.series("javascripts"));
});

gulp.task("server", function(cb) {
  exec("node server", function(err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task("compile", gulp.series("javascripts"));
gulp.task("serve", gulp.parallel("compile", "server", "watch"));