Input based signal check gives not a function error

I have an input signal which I take and set as attribute but in browser I see an error

this.width is not a function
​

export class SkeletonComponent implements OnInit {
readonly width = input<string>('');

ngOnInit(): void {
if (isPlatformServer(this.platformId)) {
return;
}

const host = this.host.nativeElement;
host.style.setProperty('--app-skeleton-width', this.width() || '100%');

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