export declare class MutationObserverSettings implements MutationObserverInit {
    attributeFilter?: string[];
    attributeOldValue: boolean;
    attributes: boolean;
    characterData: boolean;
    characterDataOldValue: boolean;
    childList: boolean;
    subtree: boolean;
    /** Fire the observer callback initially with no mutations. */
    initial: boolean;
}
export declare class ResizeObserverSettings implements ResizeObserverOptions {
    box?: ResizeObserverBoxOptions;
    /** Fire the observer callback initially with no mutations. */
    initial: boolean;
}
export declare class IntersectionObserverSettings {
    root?: Element | Document | null;
    rootMargin?: string;
    threshold?: number | number[];
    observer?: IntersectionObserver;
}
export declare const observe: {
    resize: import("to-fluent").Fluent<(el: Element, fn: ResizeObserverCallback) => () => void, Required<ResizeObserverSettings>>;
    intersection: import("to-fluent").Fluent<(el: Element, fn: IntersectionObserverCallback) => (() => void) & {
        observer: IntersectionObserver;
    }, Required<IntersectionObserverSettings>>;
    mutation: import("to-fluent").Fluent<(el: Element | ShadowRoot, fn: MutationCallback) => () => void, Required<MutationObserverSettings>>;
    gc: <T>(item: object, value: T, fn: (heldValue: T) => void) => FinalizationRegistry<T>;
};