use rollup CLI for build

.babelrc

@@ -15,5 +15,6 @@
 		"es6.classes",
 		"es6.destructuring"
 	],
-	"compact": false
+	"compact": false,
+	"sourceMap": true
 }

gobblefile.js

@@ -1,57 +0,0 @@
-var gobble = require( 'gobble' );
-var fs = require( 'fs' );
-
-var version = require( './package.json' ).version;
-var commitHash = (function () {
-	try {
-		return fs.readFileSync( '.commithash', 'utf-8' );
-	} catch ( err ) {
-		return 'unknown';
-	}
-})();
-
-var banner = fs.readFileSync( 'src/banner.js' ).toString()
-	.replace( '${version}', version )
-	.replace( '${time}', new Date() )
-	.replace( '${commitHash}', commitHash );
-
-var src = gobble( 'src' );
-
-var node = src
-	.transform( 'rollup-babel', {
-		entry: 'rollup.js',
-		dest: 'rollup.js',
-		format: 'cjs',
-		external: [ 'fs' ],
-		sourceMap: true,
-		banner: banner,
-		load: function ( id ) {
-			if ( ~id.indexOf( 'rollup.js' ) ) {
-				return fs.readFileSync( 'src/rollup.js', 'utf-8' ).replace( /<@VERSION@>/, version );
-			}
-		}
-	});
-
-var browserPlaceholders = {
-	fs: fs.readFileSync( 'browser/fs.js' ).toString(),
-	promise: fs.readFileSync( 'browser/promise.js' ).toString()
-};
-
-var browser = src
-	.transform( 'rollup-babel', {
-		entry: 'rollup.js',
-		dest: 'rollup.browser.js',
-		format: 'umd',
-		moduleName: 'rollup',
-		sourceMap: true,
-		banner: banner,
-		load: function ( id ) {
-			if ( ~id.indexOf( 'rollup.js' ) ) {
-				return fs.readFileSync( 'src/rollup.js', 'utf-8' ).replace( /<@VERSION@>/, version );
-			}
-			if ( ~id.indexOf( 'fs.js' ) ) return browserPlaceholders.fs;
-			if ( ~id.indexOf( 'es6-promise' ) ) return browserPlaceholders.promise;
-		}
-	});
-
-module.exports = gobble([ node, browser ]);

package.json

@@ -14,8 +14,9 @@
     "test-coverage": "rm -rf coverage/* && istanbul cover --report json node_modules/.bin/_mocha -- -u exports -R spec test/test.js",
     "posttest-coverage": "remap-istanbul -i coverage/coverage-final.json -o coverage/coverage-remapped.json -b dist && remap-istanbul -i coverage/coverage-final.json -o coverage/coverage-remapped.lcov -t lcovonly -b dist && remap-istanbul -i coverage/coverage-final.json -o coverage/coverage-remapped -t html -b dist",
     "ci": "npm run test-coverage && codecov < coverage/coverage-remapped.lcov",
-    "build": "git rev-parse HEAD > .commithash && gobble build -f dist",
+    "build": "git rev-parse HEAD > .commithash && rollup -c",
-    "prepublish": "npm test",
+    "build:browser": "git rev-parse HEAD > .commithash && rollup -c rollup.config.browser.js",
+    "prepublish": "npm test && npm run build:browser",
     "lint": "eslint src"
   },
   "repository": {
@@ -46,11 +47,6 @@
     "es6-promise": "^3.0.2",
     "eslint": "^1.7.1",
     "estree-walker": "^0.2.0",
-    "gobble": "^0.10.1",
-    "gobble-babel": "^5.5.8",
-    "gobble-cli": "^0.6.0",
-    "gobble-rollup": "^0.10.0",
-    "gobble-rollup-babel": "^0.6.1",
     "istanbul": "^0.4.0",
     "magic-string": "^0.8.0",
     "mocha": "^2.3.3",

rollup.config.browser.js

@@ -0,0 +1,12 @@
+import config from './rollup.config.js';
+
+config.plugins.push({
+	load: function ( id ) {
+		if ( ~id.indexOf( 'fs.js' ) ) return readFileSync( 'browser/fs.js' ).toString();
+		if ( ~id.indexOf( 'es6-promise' ) ) return readFileSync( 'browser/promise.js' ).toString();
+	}
+});
+
+config.format = 'umd';
+
+export default config;

rollup.config.js

@@ -0,0 +1,32 @@
+import { readFileSync } from 'fs';
+import babel from 'rollup-plugins-babel';
+import replace from 'rollup-plugins-replace';
+
+var pkg = JSON.parse( readFileSync( 'package.json', 'utf-8' ) );
+var version = JSON.parse( pkg.version );
+var commitHash = (function () {
+	try {
+		return readFileSync( '.commithash', 'utf-8' );
+	} catch ( err ) {
+		return 'unknown';
+	}
+})();
+
+var banner = readFileSync( 'src/banner.js', 'utf-8' )
+	.replace( '${version}', version )
+	.replace( '${time}', new Date() )
+	.replace( '${commitHash}', commitHash );
+
+export default {
+	entry: 'src/rollup.js',
+	format: 'cjs',
+	plugins: [
+		babel(),
+		replace({
+			'VERSION': pkg.version
+		})
+	],
+	external: [ 'fs' ],
+	banner: banner,
+	sourceMap: true
+};