Compiling ES5 JavaScript via Babel from TypeScript as a gulp task.

typescript-babel-gulp.js

var babel = require("gulp-babel"),
    glob = require("glob"),
    gulp = require("gulp"),
    concat = require('gulp-concat'),
    sourcemaps = require("gulp-sourcemaps"),
    typescript = require("gulp-typescript");

gulp.task("javascript", function () {
    var typescriptCompile = gulp.src(["./Scripts/**/*.ts", "./Scripts/typings/**/*.d.ts"])
        .pipe(sourcemaps.init())
        .pipe(typescript({
            target: "ES6"
        }));
    return typescriptCompile.js
        .pipe(babel({
            presets: ["es2015"],
            plugins: ["transform-es2015-modules-amd"],
            moduleIds: true
        }))
        .pipe(concat("Scripts/script.js"))
        .pipe(sourcemaps.write("./", { sourceRoot: "/Scripts" }))
        .pipe(gulp.dest("."));
});