Answers for "Property 'element' has no initializer and is not definitely assigned in the constructor."

Property 'firstName' has no initializer and is not definitely assigned in the constructor

"angularCompilerOptions": {
    //   ...
    "strictPropertyInitialization": false
    //   ...
  }

Property has no initializer and is not definitely assigned in the constructor

@Component({...})
export class Component {
  @Input() myInput: string|undefined;
}

OR

@Component({...})
export class Component {
  @Input() myInput!: string;
}

Property 'form' has no initializer and is not definitely assigned in the constructor.

"strictPropertyInitialization": false

Property 'variable' has no initializer and is not definitely assigned in the constructor.

@Component({...})
export class Component {
  @Input() myInput!: string;
}