gulpfile.js

var fs = require("fs");
var gulp = require("gulp");
var exit = require("gulp-exit");

var browserify = require("browserify");
var watchify = require("watchify");
var babelify = require("babelify");

var source = require("vinyl-source-stream");
var buffer = require("vinyl-buffer");

var sourcemaps = require("gulp-sourcemaps");

var concat = require("gulp-concat");
var rename = require("gulp-rename");
var minify = require("gulp-babel-minify");
var jsdoc = require("gulp-jsdoc3");
var webpack = require("webpack-stream");

function compile(watch) {
  var bundler = watchify(
    browserify("./app.js", {
      debug: true
    }).transform(babelify, {
      presets: [
        [
          "env",
          {
            targets: {
              chrome: "65"
            }
          }
        ]
      ],
      sourceMaps: true
    })
  );

  function rebundle() {
    return bundler
      .bundle()
      .on("error", function(err) {
        console.error(err);
        this.emit("end");
      })
      .pipe(source("build.js"))
      .pipe(buffer())
      .pipe(rename("smiles-drawer.js"))
      .pipe(
        sourcemaps.init({
          loadMaps: true
        })
      )
      .pipe(gulp.dest("./dist/"))
      .pipe(
        minify({
          mangle: false
        })
      )
      .pipe(rename("smiles-drawer.min.js"))
      .pipe(sourcemaps.write("./"))
      .pipe(gulp.dest("./dist"));
  }

  if (watch) {
    bundler.on("update", function() {
      console.log("-> bundling...");
      rebundle();
    });

    rebundle();
  } else {
    rebundle().pipe(exit());
  }
}

function watch() {
  return compile(true);
}

gulp.task("build", function() {
  return new Promise(function(resolve, reject) {
    compile();
    resolve();
  });
});

gulp.task("watch", function() {
  return new Promise(function(resolve, reject) {
    watch();
    resolve();
  });
});

gulp.task("doc", function(cb) {
  return new Promise(function(resolve, reject) {
    var config = require("./jsdocConfig.json");
    gulp
      .src(["README.md", "./src/*.js"], {
        read: false
      })
      .pipe(jsdoc(config, cb));
    resolve();
  });
});

gulp.task("default", gulp.series(gulp.parallel("build", "doc")));