Jakiego typu jest $event w <input (change)

<input type="file" class="file-input" (change)="onImageUpload($event)">

imageDisplay;
 onImageUpload(event) {
        const file: File = event.target.files[0];
        if (file) {
            const fileReader = new FileReader();
            fileReader.onload = () => {
                this.imageDisplay = fileReader.result;
            };
            fileReader.readAsDataURL(file);
        }
    }

Błąd: Parameter 'event' implicitly has an 'any' type.

onImageUpload(event: Event) {
    const file: File = event.target.files[0];
    if (file) {
        const fileReader = new FileReader();
        fileReader.onload = () => {
            this.imageDisplay = fileReader.result;
        };
        fileReader.readAsDataURL(file);
    }
}

'event.target' is possibly 'null'.

57         const file: File = event.target.files[0];

Property 'files' does not exist on type 'EventTarget'.

57         const file: File = event.target.files[0];

 onImageUpload(event: Event) {
    if (event.target) {
        const file: File = event.target.files[0];
        if (file) {
            const fileReader = new FileReader();
            fileReader.onload = () => {
                this.imageDisplay = fileReader.result;
            };
            fileReader.readAsDataURL(file);
        }
    }
}

onImageUpload(e: Event & { target: HTMLInputElement }) {
  const files = e.target.files;

  // Tablica files jest pusta
  if (!files.length) {
    return;
  }

  // Operacje na podanych plikach
  // ...
}

(change)="onImageUpload($event)

Argument of type 'Event' is not assignable to parameter of type 'Event & { target: HTMLInputElement; }'.
  Type 'Event' is not assignable to type '{ target: HTMLInputElement; }'.
    Types of property 'target' are incompatible.
      Type 'EventTarget | null' is not assignable to type 'HTMLInputElement'.
        Type 'null' is not assignable to type 'HTMLInputElement'.

if (!(event.target instanceof HTMLInputElement)) return;

Argument of type 'Event' is not assignable to parameter of type 'Event & { target: HTMLInputElement; }'.
  Type 'Event' is not assignable to type '{ target: HTMLInputElement; }'.
    Types of property 'target' are incompatible.

 onImageUpload(event: Event) {
        if (!(event.target instanceof HTMLInputElement)) return;
        const files = event.target.files;
        if (!files?.length) {
            return;
        }
        if (files[0]) {
            const fileReader = new FileReader();
            fileReader.onload = () => {
                this.imageDisplay = fileReader.result;
            };
            fileReader.readAsDataURL(files[0]);
        }
    }