fix(Angular): add hot loader for lazy loaded NgModules

Author: sis0k0

lazy-ngmodule-hot-loader.js

@@ -0,0 +1,17 @@
+const { safeGet } = require("./projectHelpers");
+
+const LAZY_RESOURCE_CONTEXT = "$$_lazy_route_resource";
+const HOT_SELF_ACCEPT = "module.hot && module.hot.accept()";
+
+const isLazyLoadedNgModule = resource => {
+    const issuer = safeGet(resource, "issuer");
+    const issuerContext = safeGet(issuer, "context");
+
+    return issuerContext && issuerContext.endsWith(LAZY_RESOURCE_CONTEXT);
+};
+
+module.exports = function (source) {
+    return isLazyLoadedNgModule(this._module) ?
+        `${source};${HOT_SELF_ACCEPT}`:
+        source;
+};

templates/webpack.angular.js

@@ -192,6 +192,7 @@ module.exports = env => {
                     test: /(?:\.ngfactory\.js|\.ngstyle\.js|\.ts)$/,
                     use: [
                         "nativescript-dev-webpack/moduleid-compat-loader",
+                        "nativescript-dev-webpack/lazy-ngmodule-hot-loader",
                         "@ngtools/webpack",
                     ]
                 },