NativeScript · PanayotCankov · Nov 22, 2017 · Nov 21, 2017
diff --git a/tns-core-modules/globals/globals.ts b/tns-core-modules/globals/globals.ts
@@ -34,6 +34,31 @@ global.registerModule = function(name: string, loader: ModuleLoader): void {
     modules.set(name, loader);
 }
 
+interface Context {
+    keys(): string[];
+    (key: string): any;
+}
+interface ExtensionMap {
+    [originalFileExtension: string]: string;
+}
+
+const defaultExtensionMap = { ".js": ".js", ".ts": ".js", ".css": ".css", ".scss": ".css", ".xml": ".xml" };
+global.registerWebpackModules = function registerWebpackModules(context: Context, extensionMap: ExtensionMap = {}) {
+    context.keys().forEach(key => {
+        const extDotIndex = key.lastIndexOf(".");
+        const base = key.substr(0, extDotIndex);
+        const originalExt = key.substr(extDotIndex);
+        const registerExt = extensionMap[originalExt] || defaultExtensionMap[originalExt];
+        const registerName = base + registerExt;
+        if (registerName.startsWith("./") && registerName.endsWith(".js")) {
+            const jsNickName = registerName.substr(2, registerName.length - 5);
+            // This is extremely short version like "main-page" that was promoted to be used with global.registerModule("module-name", loaderFunc);
+            global.registerModule(jsNickName, () => context(key));
+        }
+        global.registerModule(registerName, () => context(key));
+    });
+}
+
 global.moduleExists = function(name: string): boolean {
     return modules.has(name);
 }

diff --git a/tns-core-modules/module.d.ts b/tns-core-modules/module.d.ts
@@ -14,6 +14,20 @@ declare namespace NodeJS {
         android?: any;
         require(id: string): any;
         registerModule(name: string, loader: ((name: string) => any)): void;
+        /**
+         * Register all modules from a webpack context.
+         * The context is one created using the following webpack utility:
+         * https://webpack.github.io/docs/context.html
+         * 
+         * The extension map is optional, modules in the webpack context will have their original file extension (e.g. may be ".ts" or ".scss" etc.),
+         * while the built-in module builders in {N} will look for ".js", ".css" or ".xml" files. Adding a map such as:
+         * ```
+         * { ".ts": ".js" }
+         * ```
+         * Will resolve lookups for .js to the .ts file.
+         * By default scss, and ts files are mapped.
+         */
+        registerWebpackModules(context: { keys(): string[], (key: string): any }, extensionMap?: { [originalFileExtension: string]: string });
         /**
          * The NativeScript XML builder, style-scope, application modules use various resources such as:
          * app.css, page.xml files and modules during the application life-cycle.

diff --git a/tns-core-modules/ui/builder/builder.ts b/tns-core-modules/ui/builder/builder.ts
@@ -82,13 +82,13 @@ function loadCustomComponent(componentPath: string, componentName?: string, attr
 
     if (xmlFilePath) {
         // Custom components with XML
-        var jsFilePath = resolveFileName(fullComponentPathFilePathWithoutExt, "js");
 
         var subExports = context;
         if (global.moduleExists(moduleName)) {
             // Component has registered code module.
             subExports = global.loadModule(moduleName);
         } else {
+            var jsFilePath = resolveFileName(fullComponentPathFilePathWithoutExt, "js");
             if (jsFilePath) {
                 // Component has code file.
                 subExports = global.loadModule(jsFilePath)

diff --git a/tns-core-modules/ui/builder/component-builder/component-builder.ts b/tns-core-modules/ui/builder/component-builder/component-builder.ts
@@ -11,6 +11,8 @@ import { profile } from "../../../profiling";
 import * as debugModule from "../../../utils/debug";
 import * as platform from "../../../platform";
 
+import * as filesystem from "../../../file-system";
+
 const UI_PATH = "ui/";
 const MODULES = {
     "TabViewItem": "ui/tab-view",
@@ -119,6 +121,13 @@ const applyComponentCss = profile("applyComponentCss", (instance: View, moduleNa
 
     if (typeof (<any>instance).addCssFile === "function") {//instance instanceof Page) {
         if (moduleNamePath && !cssApplied) {
+
+            const appPath = filesystem.knownFolders.currentApp().path;
+            const cssPathRelativeToApp = (moduleNamePath.startsWith(appPath) ? "./" + moduleNamePath.substr(appPath.length + 1) : moduleNamePath) + ".css";
+            if (global.moduleExists(cssPathRelativeToApp)) {
+                (<any>instance).addCssFile(cssPathRelativeToApp);
+            }
+
             let cssFilePath = resolveFileName(moduleNamePath, "css");
             if (cssFilePath) {
                 (<any>instance).addCssFile(cssFilePath);

diff --git a/tns-core-modules/ui/styling/style-scope.ts b/tns-core-modules/ui/styling/style-scope.ts
@@ -508,7 +508,7 @@ export class StyleScope {
         }
 
         this._reset();
-        let parsedCssSelectors = cssString ? CSSSource.fromSource(cssString, this._keyframes, cssFileName) : CSSSource.fromFile(cssFileName, this._keyframes);
+        let parsedCssSelectors = cssString ? CSSSource.fromSource(cssString, this._keyframes, cssFileName) : CSSSource.fromURI(cssFileName, this._keyframes);
         this._css = this._css + parsedCssSelectors.source;
         this._localCssSelectors.push.apply(this._localCssSelectors, parsedCssSelectors.selectors); 
         this._localCssSelectorVersion++;