refactor(transformer): add a comment for each transform operation

Author: sis0k0

transformers/ns-replace-bootstrap.ts

@@ -81,16 +81,25 @@ export function nsReplaceBootstrap(getNgCompiler: () => AngularCompilerPlugin):
  const factoryClassName = entryModule.className + 'NgFactory';
  const factoryModulePath = normalizedEntryModulePath + '.ngfactory';
  ops.push(
- // Replace the entry module import.
+ // Insert an import of the module factory:
+ // import * as __NgCli_bootstrap_1 from "./app.module.ngfactory";
  ...insertStarImport(sourceFile, idNgFactory, factoryModulePath),
+
+ // Replace the NgModule nodes with NgModuleFactory nodes
+ // from 'AppModule' to 'AppModuleNgFactory'
  new ReplaceNodeOperation(sourceFile, entryModuleIdentifier,
  ts.createPropertyAccess(idNgFactory, ts.createIdentifier(factoryClassName))),
 
- // Replace the platformBrowserDynamic import.
+ // Insert an import of the {N} Angular static bootstrap module:
+ // import * as __NgCli_bootstrap_2 from "nativescript-angular/platform-static";
  ...insertStarImport(sourceFile, idPlatformBrowser, 'nativescript-angular/platform-static'),
+
+ // Replace 'platformNativeScriptDynamic' with 'platformNativeScript'
+ // and elide all imports of 'platformNativeScriptDynamic'
  new ReplaceNodeOperation(sourceFile, platformBrowserDynamicIdentifier,
  ts.createPropertyAccess(idPlatformBrowser, 'platformNativeScript')),
 
+ // Replace the invocation of 'boostrapModule' with 'bootsrapModuleFactory'
  new ReplaceNodeOperation(sourceFile, bootstrapModuleIdentifier,
  ts.createIdentifier('bootstrapModuleFactory')),
  );