diff --git a/config.json b/config.json
index 16dafda6..134d0617 100644
--- a/config.json
+++ b/config.json
@@ -1,4 +1,4 @@
 {
-  "version": "0.1.0",
+  "version": "0.2.0",
   "repository": "https://github.com/guess-js/guess"
 }
diff --git a/infra/build.ts b/infra/build.ts
index 066c6938..97f22fa5 100755
--- a/infra/build.ts
+++ b/infra/build.ts
@@ -39,7 +39,7 @@ const build = (hook = (path: string) => {}) => {
 
   for (const p of Packages) {
     const path = join(PackagesDir, p);
-    console.log(execSync(`cd ${path} && rm -rf dist && ${cwd}/node_modules/.bin/webpack .`).toString());
+    console.log(execSync(`cd ${path} && rm -rf dist && ${cwd}/node_modules/.bin/webpack`).toString());
     const packageJsonPath = join(path, 'package.json');
     const packageJson = JSON.parse(fs.readFileSync(packageJsonPath).toString());
     packageJson.version = config.version;
diff --git a/packages/ga/src/ga.ts b/packages/ga/src/ga.ts
index 627d1f06..b2fc0fb5 100644
--- a/packages/ga/src/ga.ts
+++ b/packages/ga/src/ga.ts
@@ -2,7 +2,7 @@ import { getClient } from './client';
 import { normalize } from './normalize';
 import { Graph, Period } from '../../common/interfaces';
 
-const PageSize = 1000;
+const PageSize = 10000;
 const id = (r: string) => r;
 const DefaultExpression = 'ga:pageviews';
 
diff --git a/packages/ga/webpack.config.js b/packages/ga/webpack.config.js
index eb71aa74..dd530002 100644
--- a/packages/ga/webpack.config.js
+++ b/packages/ga/webpack.config.js
@@ -1,5 +1,5 @@
 module.exports = {
-  mode: 'development',
+  mode: 'production',
   entry: './index.ts',
   target: 'node',
   output: {
diff --git a/packages/parser/webpack.config.js b/packages/parser/webpack.config.js
index 30544312..845b10a6 100644
--- a/packages/parser/webpack.config.js
+++ b/packages/parser/webpack.config.js
@@ -1,5 +1,5 @@
 module.exports = {
-  mode: 'development',
+  mode: 'production',
   entry: './index.ts',
   target: 'node',
   output: {
diff --git a/packages/webpack/package.json b/packages/webpack/package.json
index 733a3c06..3a323458 100644
--- a/packages/webpack/package.json
+++ b/packages/webpack/package.json
@@ -2,7 +2,7 @@
   "name": "guess-webpack",
   "version": "0.1.0",
   "description": "Webpack plugins for the Machine Learning-driven bundler",
-  "main": "webpack/index.js",
+  "main": "webpack/main.js",
   "types": "webpack/index.d.ts",
   "repository": {
     "type": "git",
diff --git a/packages/webpack/src/api.ts b/packages/webpack/src/api.ts
index 27087285..2f5be44a 100644
--- a/packages/webpack/src/api.ts
+++ b/packages/webpack/src/api.ts
@@ -1,2 +1,2 @@
-export const guess = (current: string, links?: string[]) =>
-  ((typeof window === 'undefined' ? global : window) as any).__GUESS__.guess(current, links);
+export const guess = (params: any) =>
+  ((typeof window === 'undefined' ? global : window) as any).__GUESS__.guess(params);
diff --git a/packages/webpack/src/ga-provider.ts b/packages/webpack/src/ga-provider.ts
index 9c8c6e5d..4b6d084d 100644
--- a/packages/webpack/src/ga-provider.ts
+++ b/packages/webpack/src/ga-provider.ts
@@ -1,4 +1,4 @@
-import { auth } from 'google-oauth2-node';
+import { auth as oauth2 } from 'google-oauth2-node';
 import { RoutingModule, Period, Graph } from '../../common/interfaces';
 import { fetch } from 'guess-ga';
 
@@ -13,6 +13,7 @@ const cache = flatCache.load('guess-plugin');
 const id = <T>(r: T) => r;
 
 export interface Config {
+  jwt?: any;
   viewId: string;
   routes: RoutingModule[];
   formatter?: (path: string) => string;
@@ -28,19 +29,26 @@ export const getReport = (c: Config): Promise<Graph> => {
   if (report) {
     return Promise.resolve(JSON.parse(report));
   }
-  return auth({
-    clientId,
-    clientSecret,
-    scope
-  })
-    .then((token: any) => {
-      const { google } = require('googleapis');
+  const { google } = require('googleapis');
+  let client: Promise<{}> = Promise.reject('Non-existing GA token');
+  if (!c.jwt) {
+    client = oauth2({
+      clientId,
+      clientSecret,
+      scope
+    }).then((token: any) => {
       const oauth2Client = new google.auth.OAuth2();
       oauth2Client.setCredentials(token);
-
+      return oauth2Client;
+    });
+  } else {
+    client = Promise.resolve(new google.auth.JWT(c.jwt.client_email, null, c.jwt.private_key, [scope], null));
+  }
+  return client
+    .then((auth: any) => {
       return fetch({
         viewId: c.viewId,
-        auth: oauth2Client,
+        auth,
         period: period,
         routes: c.routes.map(r => r.path),
         formatter: c.formatter || id
diff --git a/packages/webpack/src/guess-webpack.ts b/packages/webpack/src/guess-webpack.ts
index acb88b7f..af061fa1 100644
--- a/packages/webpack/src/guess-webpack.ts
+++ b/packages/webpack/src/guess-webpack.ts
@@ -16,25 +16,26 @@ export interface RuntimeConfig {
 
 export interface GuessPluginConfig {
   GA?: string;
+  jwt?: any;
+  period?: Period;
   reportProvider?: (...args: any[]) => Promise<Graph>;
   mode?: Mode;
   layout?: ProjectLayout;
-  period?: Period;
+
   /** @internal */
-  routeFormatter?: (path: string) => string;
+  routeProvider?: RouteProvider | boolean;
   /** @internal */
-  debug?: boolean;
+  routeFormatter?: (path: string) => string;
   /** @internal */
   runtime?: RuntimeConfig;
-  /** @internal */
-  routeProvider?: RouteProvider | boolean;
 }
 
 export class GuessPlugin {
   constructor(private _config: GuessPluginConfig) {
-    if (this._config.GA && this._config.reportProvider) {
+    if ((this._config.GA || this._config.jwt) && this._config.reportProvider) {
       throw new Error(
-        'Only a single report provider is allowed. You have specified `GA` (used by Google Analytics provider) and `reportProvider`'
+        'Only a single report provider is allowed. You have specified `GA` and/or ' +
+          'a GA authentication provider (used by Google Analytics provider) and `reportProvider`'
       );
     }
     if (!this._config.GA && !this._config.reportProvider) {
@@ -50,11 +51,12 @@ export class GuessPlugin {
 
   private _execute(compilation: any, cb: any) {
     extractRoutes(this._config).then(routes => {
-      this._getReport(routes).then(
+      return this._getReport(routes).then(
         data => {
           return this._executePrefetchPlugin(data, routes, compilation, cb);
         },
         err => {
+          console.error(err);
           cb();
           throw err;
         }
@@ -65,6 +67,7 @@ export class GuessPlugin {
   private _getReport(routes: RoutingModule[]): Promise<Graph> {
     if (this._config.GA) {
       return getReport({
+        jwt: this._config.jwt,
         viewId: this._config.GA,
         routes,
         formatter: this._config.routeFormatter,
@@ -81,7 +84,6 @@ export class GuessPlugin {
       data,
       basePath: runtime ? (runtime.basePath === undefined ? '' : runtime.basePath) : '',
       prefetchConfig: runtime ? runtime.prefetchConfig : undefined,
-      debug: this._config.debug,
       routes,
       delegate: runtime ? !!runtime.delegate : false
     }).execute(compilation, cb);
diff --git a/packages/webpack/src/prefetch-plugin.ts b/packages/webpack/src/prefetch-plugin.ts
index 19072313..184fc7d5 100644
--- a/packages/webpack/src/prefetch-plugin.ts
+++ b/packages/webpack/src/prefetch-plugin.ts
@@ -82,7 +82,7 @@ export class PrefetchPlugin {
       context: '/src/',
       mode: 'production',
       entry: './index.js',
-      target: 'web',
+      target: 'node',
       output: {
         filename: './output.js'
       }
@@ -100,7 +100,7 @@ export class PrefetchPlugin {
       }
 
       const code = stats.compilation.assets['./output.js'].source();
-      compilation.assets[mainName] = new ConcatSource(code, '\n', old.source());
+      compilation.assets[mainName] = new ConcatSource(code, '\n;', old.source());
       callback();
     });
   }
diff --git a/packages/webpack/src/runtime/guess.tpl b/packages/webpack/src/runtime/guess.tpl
index 8694e7cf..725279b7 100644
--- a/packages/webpack/src/runtime/guess.tpl
+++ b/packages/webpack/src/runtime/guess.tpl
@@ -2,4 +2,4 @@ import { initialize } from './guess';
 
 (function(g, graph, m, basePath, thresholds) {
   initialize(g, graph, m, basePath, thresholds);
-})(typeof window === 'undefined' ? {} : window, <%= GRAPH %>, <%= GRAPH_MAP %>, <%= THRESHOLDS %>);
+})(typeof window === 'undefined' ? global : window, <%= GRAPH %>, <%= GRAPH_MAP %>, <%= THRESHOLDS %>);
diff --git a/packages/webpack/src/runtime/guess.ts b/packages/webpack/src/runtime/guess.ts
index 53d6bf43..bf176f90 100644
--- a/packages/webpack/src/runtime/guess.ts
+++ b/packages/webpack/src/runtime/guess.ts
@@ -82,10 +82,6 @@ const matchRoute = (route: string, declaration: string) => {
   }
 };
 
-const polyfillConnection = {
-  effectiveType: '3g'
-};
-
 const guessNavigation = (graph: Graph, params: GuessFnParams): Navigations => {
   const matches = graph.findMatch(params.path);
   return matches.reduce(
diff --git a/packages/webpack/src/runtime/runtime.tpl b/packages/webpack/src/runtime/runtime.tpl
index 1687d243..8c311caf 100644
--- a/packages/webpack/src/runtime/runtime.tpl
+++ b/packages/webpack/src/runtime/runtime.tpl
@@ -2,4 +2,4 @@ import { initialize } from './runtime';
 
 (function(g, history, graph, m, basePath, thresholds) {
   initialize(history, g, graph, m, basePath, thresholds);
-})(typeof window === 'undefined' ? {} : window, (typeof window === 'undefined' ? {} : window).history, <%= GRAPH %>, <%= GRAPH_MAP %>, '<%= BASE_PATH %>', <%= THRESHOLDS %>);
+})(typeof window === 'undefined' ? global : window, (typeof window === 'undefined' ? {} : window).history, <%= GRAPH %>, <%= GRAPH_MAP %>, '<%= BASE_PATH %>', <%= THRESHOLDS %>);
diff --git a/packages/webpack/test/fixtures/delegate/webpack.config.js b/packages/webpack/test/fixtures/delegate/webpack.config.js
index 48653007..c341c22b 100644
--- a/packages/webpack/test/fixtures/delegate/webpack.config.js
+++ b/packages/webpack/test/fixtures/delegate/webpack.config.js
@@ -1,5 +1,5 @@
 const CopyWebpackPlugin = require('copy-webpack-plugin');
-const { GuessPlugin } = require('../../../dist/webpack/index');
+const { GuessPlugin } = require('../../../dist/webpack/main');
 
 module.exports = {
   mode: 'development',
diff --git a/packages/webpack/test/fixtures/prefetch/webpack.config.js b/packages/webpack/test/fixtures/prefetch/webpack.config.js
index 0086abb3..1bfb31de 100644
--- a/packages/webpack/test/fixtures/prefetch/webpack.config.js
+++ b/packages/webpack/test/fixtures/prefetch/webpack.config.js
@@ -1,6 +1,6 @@
 const { join } = require('path');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
-const { GuessPlugin } = require('../../../dist/webpack/index');
+const { GuessPlugin } = require('../../../dist/webpack/main');
 
 const absolute = path => {
   return join(__dirname, path);
diff --git a/packages/webpack/webpack.config.js b/packages/webpack/webpack.config.js
index 558c8afc..23cafc2f 100644
--- a/packages/webpack/webpack.config.js
+++ b/packages/webpack/webpack.config.js
@@ -22,16 +22,28 @@ const common = {
 };
 
 module.exports = [
+  Object.assign(
+    {
+      entry: './src/api.ts',
+      output: {
+        filename: 'index.js',
+        path: __dirname + '/dist/api/',
+        libraryTarget: 'commonjs'
+      },
+      target: 'web'
+    },
+    common
+  ),
   Object.assign(
     {
       entry: {
         runtime: './src/runtime/runtime.ts'
       },
-      target: 'web',
+      target: 'node',
       output: {
         filename: '[name].js',
         path: __dirname + '/dist/webpack/',
-        libraryTarget: 'umd'
+        libraryTarget: 'commonjs'
       }
     },
     common
@@ -41,11 +53,11 @@ module.exports = [
       entry: {
         guess: './src/runtime/guess.ts'
       },
-      target: 'web',
+      target: 'node',
       output: {
         filename: '[name].js',
         path: __dirname + '/dist/webpack/',
-        libraryTarget: 'umd'
+        libraryTarget: 'commonjs'
       }
     },
     common
@@ -54,7 +66,7 @@ module.exports = [
     {
       entry: './index.ts',
       output: {
-        filename: 'index.js',
+        filename: 'main.js',
         path: __dirname + '/dist/webpack/',
         libraryTarget: 'umd'
       },
@@ -71,21 +83,5 @@ module.exports = [
       ]
     },
     common
-  ),
-  Object.assign(
-    {
-      entry: './src/api.ts',
-      output: {
-        filename: 'index.js',
-        path: __dirname + '/dist/api/',
-        libraryTarget: 'umd'
-      },
-      target: 'node',
-      node: {
-        __dirname: false,
-        __filename: false
-      }
-    },
-    common
   )
 ];