Keyethereum fs dependency (#5902)

* Set process.browser

* Empty fs module (keyethereum dep)

* !==

js/src/api/local/index.js

@@ -14,4 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+if (process.env.NODE_ENV !== 'test') {
+  process.browser = true;
+}
+
 export LocalAccountsMiddleware from './localAccountsMiddleware';

js/webpack/app.js

@@ -148,6 +148,10 @@ module.exports = {
     unsafeCache: true
   },
 
+  node: {
+    fs: 'empty'
+  },
+
   plugins: (function () {
     const DappsHTMLInjection = DAPPS.filter((dapp) => !dapp.skipBuild).map((dapp) => {
       return new HtmlWebpackPlugin({

js/webpack/libraries.js

@@ -46,6 +46,10 @@ module.exports = {
     }
   },
 
+  node: {
+    fs: 'empty'
+  },
+
   module: {
     rules: [
       {

js/webpack/npm.js

@@ -70,7 +70,9 @@ module.exports = {
       }
     ]
   },
-
+  node: {
+    fs: 'empty'
+  },
   resolve: {
     alias: {
       '~': path.resolve(__dirname, '../src'),