gulpfile.js

var gulp = require("gulp");
var sass = require("gulp-sass");
var minifyHtml = require("gulp-minify-html");
var ngHtml2js = require("gulp-ng-html2js");
var ngAnnotate = require("gulp-ng-annotate");
var iife = require("gulp-iife");
var uglify = require("gulp-uglify");
var concat = require("gulp-concat");

gulp.task("sass", function() {
  return gulp.src("src/picker.scss")
    .pipe(concat("ion-datetime-picker.min.scss"))
    .pipe(sass({outputStyle: "compressed"}))
    .pipe(gulp.dest("release"));
});

gulp.task("html", function() {
  return gulp.src("src/picker-*.html")
    .pipe(minifyHtml({
      empty: true,
      spare: true,
      quotes: true
    }))
    .pipe(ngHtml2js({
      moduleName: "ion-datetime-picker",
      prefix: "lib/ion-datetime-picker/src/",
      declareModule: false
    }))
    .pipe(concat("ion-datetime-picker.min.js"))
    .pipe(gulp.dest("release"));
});

gulp.task("js", ["html"], function() {
  return gulp.src(["src/picker.js", "src/picker-*.js", "release/ion-datetime-picker.min.js"])
    .pipe(ngAnnotate())
    .pipe(concat("ion-datetime-picker.min.js"))
    .pipe(iife())
    .pipe(uglify())
    .pipe(gulp.dest("release"));
});

gulp.task("build", ["sass", "js"]);

gulp.task("default", ["build"]);