diff --git a/apps/automated/webpack.custom.config.js b/apps/automated/webpack.custom.config.js
index f13fc0393..02e1478d4 100644
--- a/apps/automated/webpack.custom.config.js
+++ b/apps/automated/webpack.custom.config.js
@@ -12,7 +12,10 @@ module.exports = (env) => {
 	]))
 
 	baseConfig.plugins.push(new webpack.DefinePlugin({
-		__CI__: !!process.env.CI
+		__CI__: !!process.env.CI,
+		__UI_USE_XML_PARSER__: true,
+		__UI_USE_EXTERNAL_RENDERER__: false,
+		__CSS_PARSER__: JSON.stringify('css-tree')
 	}))
 
 	return baseConfig;
diff --git a/packages/core/.gitignore b/packages/core/.gitignore
index 7fe498c27..1a34b6d4e 100644
--- a/packages/core/.gitignore
+++ b/packages/core/.gitignore
@@ -5,7 +5,6 @@ dist
 !xml/xml.js
 !js-libs/**/*.*
 !cli-hooks/**/*.*
-!css/**/*.js
 !css/**/*.ts
 css/parser.js*
 css/system-classes.js*
diff --git a/packages/core/__tests__/css/parser.ts b/packages/core/__tests__/css/parser.ts
index 2fabfc3d2..ac877496b 100644
--- a/packages/core/__tests__/css/parser.ts
+++ b/packages/core/__tests__/css/parser.ts
@@ -1,5 +1,7 @@
 import { assert } from 'chai';
-import { parseURL, parseColor, parsePercentageOrLength, parseBackgroundPosition, parseBackground, parseSelector, AttributeSelectorTest, CSS3Parser, TokenObjectType, CSSNativeScript } from '@nativescript/core/css/parser';
+import { parseURL, parseColor, parsePercentageOrLength, parseBackgroundPosition, parseBackground, parseSelector, AttributeSelectorTest } from '@nativescript/core/css/parser';
+import { CSS3Parser, TokenObjectType } from '@nativescript/core/css/CSS3Parser';
+import { CSSNativeScript } from '@nativescript/core/css/CSSNativeScript';
 
 import * as fs from 'fs';
 import * as shadyCss from 'shady-css-parser';
diff --git a/packages/core/css/.gitignore b/packages/core/css/.gitignore
new file mode 100644
index 000000000..1fabb47f1
--- /dev/null
+++ b/packages/core/css/.gitignore
@@ -0,0 +1 @@
+!reworkcss.js
\ No newline at end of file
diff --git a/packages/core/ui/styling/style-scope.ts b/packages/core/ui/styling/style-scope.ts
index 717dce964..659b3b6f4 100644
--- a/packages/core/ui/styling/style-scope.ts
+++ b/packages/core/ui/styling/style-scope.ts
@@ -3,8 +3,6 @@ import { ViewBase } from '../core/view-base';
 import { View } from '../core/view';
 import { unsetValue, _evaluateCssVariableExpression, _evaluateCssCalcExpression, isCssVariable, isCssVariableExpression, isCssCalcExpression } from '../core/properties';
 import { SyntaxTree, Keyframes as KeyframesDefinition, parse as parseCss, Node as CssNode } from '../../css';
-import { CSS3Parser, CSSNativeScript } from '../../css/parser';
-import { cssTreeParse } from '../../css/css-tree-parser';
 
 import { RuleSet, SelectorsMap, SelectorCore, SelectorsMatch, ChangeMap, fromAstNodes, Node } from './css-selector';
 import { Trace } from '../../trace';
diff --git a/packages/core/xml/index.js b/packages/core/xml/index.js
index d8fdb947f..e7786fcf6 100644
--- a/packages/core/xml/index.js
+++ b/packages/core/xml/index.js
@@ -1,6 +1,5 @@
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.XmlParser = exports.ParserEvent = exports.ParserEventType = void 0;
-var easysax = require('../js-libs/easysax');
 var easysax_1 = require("../js-libs/easysax");
 var ParserEventType = (function () {
     function ParserEventType() {