bundling refactor

plugins/dbgate-plugin-postgres/webpack-backend.config.js

@@ -1,6 +1,10 @@
 var webpack = require('webpack');
 var path = require('path');
 
+const packageJson = require('./package.json');
+const buildPluginExternals = require('../../common/buildPluginExternals');
+const externals = buildPluginExternals(packageJson);
+
 var config = {
   context: __dirname + '/src/backend',
 
@@ -36,13 +40,7 @@ var config = {
     }),
   ],
 
-  externals: {
-    'dbgate-tools': 'commonjs dbgate-tools',
-    'dbgate-query-splitter': 'commonjs dbgate-query-splitter',
-    lodash: 'commonjs lodash',
-    pg: 'commonjs pg',
-    'pg-copy-streams': 'commonjs pg-copy-streams',
-  }
+  externals,
 };
 
 module.exports = config;