fix(compiler-cli): propagate preserveWhitespaces option to codegen (#18773)

PR Close #18773

Author: pkozlowski-opensource

packages/compiler-cli/src/codegen.ts

@@ -103,6 +103,7 @@ export class CodeGenerator {
       locale: cliOptions.locale || undefined, missingTranslation,
       enableLegacyTemplate: options.enableLegacyTemplate !== false,
       enableSummariesForJit: options.enableSummariesForJit !== false,
+      preserveWhitespaces: options.preserveWhitespaces,
     });
     return new CodeGenerator(options, program, tsCompilerHost, aotCompiler, ngCompilerHost);
   }

packages/tsc-wrapped/src/options.ts

@@ -87,6 +87,10 @@ interface Options extends ts.CompilerOptions {
   // matched by the `files` / `includes` in the `tsconfig.json`.
   // This is off by default.
   alwaysCompileGeneratedCode?: boolean;
+
+  // Whether to remove blank text nodes from compiled templates. It is `true` by default
+  // in Angular 5 and will be re-visited in Angular 6.
+  preserveWhitespaces?: boolean;
 }
 
 export default Options;