Should I ensure that all class properties are public when using the Ahead-of-Time compiler in Angular 2?

Angular 2 rc 6, typescript 2, node 4.5.0, npm 2.15.9 running on Windows 7

I am in the process of transitioning from Just-in-Time compilation to Ahead-of-Time compilation and I am utilizing the following resources:

I have grasped the concept that I need to execute the compiler ngc to create ngfactory.ts files, as well as modify main.ts to utilize platformBrowser instead of platformBrowserDynamic for bootstrapping. However, I have encountered an obstacle and require guidance on the next steps.

1. I have verified that the application functions without errors using Just-in-Time compilation. My current main.ts code is:

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

2. I have removed all application files from my production directory but retained third-party libraries (e.g., Angular 2, Angular 2 Material)

3. Upon executing "node_modules/.bin/ngc" -p ./, there is no output displayed in the console. Each of my components and modules now has an associated .ngfactory.ts file, along with a .css.shim.ts file for component styles. Furthermore, transpiled .js and .js.map files are present in the production directory as well

4. When attempting to run the application at this stage, I encounter 404 not found errors for all the component templates stored in .html files

5. To address this issue, I manually relocate all template files (.html) to the production directory and launch the application successfully. However, it continues to use Just-in-Time compilation (255 requests, including compiler.umd.js)

6. I update my main.ts to:

enableProdMode();
platformBrowser().bootstrapModuleFactory(AppModuleNgFactory);

Despite making this adjustment, there is no noticeable impact since the new code has not been compiled. Consequently, I am unsure of the subsequent steps to take.

Should I re-run ngc? If so, I encounter multiple errors similar to:

Error at C:/path/to/notify.component.ngfactory.ts:113:41: Property 'visible' is private and only accessible within class 'NotifyComponent'
... (numerous such occurrences featuring various properties from different components)
Compilation failed

Is it necessary to make all class properties public when utilizing AoT compilation? Am I overlooking a crucial step?

Answer №1

When working with ahead-of-time compilation, it is essential that all members of a component (such as methods and properties) accessed by its template are public. This requirement stems from the fact that the template is translated into a TypeScript class. Since a generated class and a component are treated as separate entities, private members cannot be accessed across classes.

In summary, if you opt for ahead-of-time compilation, private members cannot be accessed in your templates.

Answer №2

Indeed, in the latest release of Angular 2 paired with Ionic2 RC1

An alternative solution for working with Fields could involve utilizing getters without setters

protected _myField: any;

get myField(): any { 
  return this._myField; 
}

For more insights, check out additional JiT to AoT considerations on how to adjust your code in this blog post by Isaac Mann

  1. const lambda => export function
  2. default export => named export
  3. private, protected accessors should be made public for members accessed from the template
  4. dynamic component template => static template
  5. moduleId must be specified for components with a templateUrl

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