Is there any special significance to the statement x = x in TypeScript/Angular?

The Fontawesome/Angular documentation provides an example of adding an explicit reference, which may not be as convenient as using the library directly. If you value "explicit is better than implicit," then this method might be for you. The example code snippet from the documentation is shown below:

Explicit reference Not as convenient as using the library but if you believe "explicit is better than implicit" then this method is for you.

src/app/app.component.html

<div style="text-align:center">
  <fa-icon [icon]="faCoffee"></fa-icon>
</div>

src/app/app.component.ts

import { Component } from '@angular/core';
import { faCoffee } from '@fortawesome/free-solid-svg-icons';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'app';
  faCoffee = faCoffee;
}

Understanding the line 'faCoffee=faCoffee' in TypeScript/Angular - is this a bug, a hack, or some kind of magic? That is the question to be explored here.

Answer №1

From my understanding, the template app.component.html within a component is unable to directly access the imports utilized in the corresponding typescript file app.component.ts.

Instead, the template file has access only to the members of the AppComponent class. This means that in order to utilize imports within a template file, you must declare a corresponding member in the class.

Answer №2

When working on your component class, it is important to create a variable called faCoffe because it is used in the template. However, feel free to rename this variable to whatever name suits your needs.

Importing the reference does not actually do anything, it simply allows the faCoffe variable from the dependency to be accessible within the file.

Below is an example of how this code can be implemented:

import { Component } from '@angular/core';
import { faCoffee as freeIcons } from '@fortawesome/free-solid-svg-icons';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'app';
  faCoffee = freeIcons;
}

Answer №3

When using Angular templates, they are only able to access the public properties of the component they are associated with.

For instance, if there is a function within the component called myFunction(), the template can call it by using something like (click)="myFunction()".

The same concept applies to variables. If there is a property imported into the component, it will only be accessible in the template if the component defines it as a property. Personally, I find it clearer to prefix such properties with public for better readability:

public faCoffee = faCoffee;

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