Move the buildsystem to rollup

.npmignore

@@ -12,3 +12,4 @@
 bower.json
 composer.json
 Gruntfile.js
+rollup.config.js

Gruntfile.js

@@ -6,96 +6,24 @@ var fs = require("fs"),
 module.exports = function (grunt) {
 	grunt.initConfig({
 		pkg: grunt.file.readJSON("package.json"),
-		concat: {
-			options: {
-				banner: "/**\n" +
-				" * <%= pkg.name %>\n" +
-				" *\n" +
-				" * @copyright <%= grunt.template.today('yyyy') %> <%= pkg.author %>\n" +
-				" * @license <%= pkg.license %>\n" +
-				" * @version <%= pkg.version %>\n" +
-				" */\n"
-			},
-			dist: {
-				src: [
-					"<banner>",
-					"src/intro.js",
-					"src/filesize.js",
-					"src/outro.js"
-				],
-				dest: "lib/filesize.es6.js"
-			}
-		},
-		"babel": {
-			options: {
-				sourceMap: false,
-				presets: ["@babel/preset-env"]
-			},
-			dist: {
-				files: {
-					"lib/<%= pkg.name %>.js": "lib/<%= pkg.name %>.es6.js"
-				}
-			}
-		},
+
 		eslint: {
 			target: [
 				"Gruntfile.js",
 				"test/*.js",
-				"lib/<%= pkg.name %>.es6.js"
+				"src/*.js"
 			]
 		},
 		nodeunit: {
 			all: ["test/*.js"]
 		},
-		uglify: {
-			options: {
-				banner: "/*\n <%= grunt.template.today('yyyy') %> <%= pkg.author %>\n @version <%= pkg.version %>\n*/",
-				sourceMap: true,
-				sourceMapIncludeSources: true
-			},
-			target: {
-				files: {
-					"lib/filesize.min.js": ["lib/filesize.js"]
-				}
-			}
-		},
-		watch: {
-			js: {
-				files: "<%= concat.dist.src %>",
-				tasks: "build"
-			},
-			pkg: {
-				files: "package.json",
-				tasks: "build"
-			}
-		}
 	});
 
 	// tasks
-	grunt.loadNpmTasks("grunt-contrib-concat");
 	grunt.loadNpmTasks("grunt-contrib-nodeunit");
-	grunt.loadNpmTasks("grunt-contrib-watch");
-	grunt.loadNpmTasks("grunt-contrib-uglify");
-	grunt.loadNpmTasks("grunt-babel");
 	grunt.loadNpmTasks("grunt-eslint");
-	grunt.task.registerTask("babili", "Minifies ES2016+ code", function () {
-		const data = fs.readFileSync(path.join(__dirname, "lib", "filesize.es6.js"), "utf8"),
-			minified = require("babel-core").transform(data, {
-				sourceFileName: "filesize.es6.js",
-				sourceMaps: true,
-				presets: ["minify"]
-			}),
-			pkg = require(path.join(__dirname, "package.json")),
-			banner = "/*\n " + new Date().getFullYear() + " " + pkg.author + "\n @version " + pkg.version + "\n*/\n\"use strict\";";
-
-		fs.writeFileSync(path.join(__dirname, "lib", "filesize.es6.min.js"), banner + minified.code + "\n//# sourceMappingURL=filesize.es6.min.js.map", "utf8");
-		grunt.log.ok("1 file created.");
-		fs.writeFileSync(path.join(__dirname, "lib", "filesize.es6.min.js.map"), JSON.stringify(minified.map), "utf8");
-		grunt.log.ok("1 sourcemap created.");
-	});
 
 	// aliases
 	grunt.registerTask("test", ["eslint", "nodeunit"]);
-	grunt.registerTask("build", ["concat", "babel"]);
-	grunt.registerTask("default", ["build", "test", "babili", "uglify"]);
+	grunt.registerTask("default", ["test"]);
 };

lib/filesize.es6.js

@@ -5,7 +5,12 @@
  * @license BSD-3-Clause
  * @version 6.1.0
  */
-(function (global) {
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(global = global || self, global.filesize = factory());
+}(this, (function () { 'use strict';
+
 	const b = /^(b|B)$/,
 		symbol = {
 			iec: {
@@ -150,12 +155,6 @@
 	// Partial application for functional programming
 	filesize.partial = opt => arg => filesize(arg, opt);
 
-	// CommonJS, AMD, script tag
-	if (typeof exports !== "undefined") {
-		module.exports = filesize;
-	} else if (typeof define === "function" && define.amd !== void 0) {
-		define(() => filesize);
-	} else {
-		global.filesize = filesize;
-	}
-}(typeof window !== "undefined" ? window : global));
+	return filesize;
+
+})));