Basic gulp usage to get up and running with a very minimal gulp scenario

gulpfile.ts

/**
 * Created by pligor on 5/26/15.
 */

///<reference path="./declarations/node.d.ts"/>
///<reference path="./declarations/gulp.d.ts"/>

var gulp = require("gulp")
//var plugins = require('gulp-load-plugins')(); // Load all gulp plugins
// automatically and attach
// them to the `plugins` object

var runSequence = require('run-sequence');    // Temporary solution until gulp 4
                                              // https://github.com/gulpjs/gulp/issues/355

var preprocess = require('gulp-preprocess');

var pkg = require('./package.json');
var dirs = pkg['h5bp-configs'].directories; //h5bp means html5 boiler plate

var htmlPath = dirs.src + "/index.html"

gulp.task("include_production_libraries", () => {
    return gulp.src(htmlPath).pipe(
        preprocess({
            context: {
                production: null    //does not care of the value, just to define the element
            }
        })
    ).pipe(gulp.dest(dirs.dist))
})

gulp.task('copyallrest', () => {
    return gulp.src([
        dirs.src + '/**/*',
        '!' + htmlPath,
    ]).pipe(gulp.dest(dirs.dist));
});

gulp.task("default", () => {
    //nothing for now
})