The standard specifications for an angular component decorator's properties

Is it possible to set default properties for an angular component using a decorator?

For instance, consider this component setup:

@Component({ 
selector: 'my-component', 
standalone: true, 
host: { class: 'flx' }, 
changeDetection: ChangeDetectionStrategy.OnPush, 
imports: [MyModule], 
template: `<div>My Awesome Component </div;`})
export class MyComponent {}

I commonly use the following 3 attributes in many components:

standalone: true, 
host: { class: 'flx' }, 
changeDetection: ChangeDetectionStrategy.OnPush,

In the past, it was possible to define custom decorators or use a spread operator like this:


const defProps = {
   standalone: true, 
   host: { class: 'flx' }, 
   changeDetection: ChangeDetectionStrategy.OnPush,
}

@Component({ 
selector: 'my-component', 
...defProps,
imports: [MyModule], 
template: `<div>My Awesome Component </div;`})
export class MyComponent {}

However, this approach no longer works with the latest Angular versions (16 and 17).

Are there alternative options available? Ideally, I would like to create a component decorator with all my default logic and properties.

PS. While the CLI can create components, that is not a viable solution for me.

Answer №1

According to the information provided in the NG1001 documentation

  • In order to speed up metadata extraction within the Angular compiler, the decorators @NgModule, @Pipe, @Component, @Directive, and @Injectable will only accept object literals as arguments.
  • This change in behavior is a deliberate decision in Ivy, which imposes stricter requirements for decorator arguments compared to View Engine. Ivy enforces this approach because it processes decorators by relocating the expressions within the class output.

Therefore, each decorator needs to be defined individually, as Ivy/Angular compiler will not recognize anything other than a literal definition!

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