export type LayoutShiftSourceRect = {
    x: number;
    y: number;
    width: number;
    height: number;
};
export type LayoutShiftSource = {
    locator: string;
    previousRect: LayoutShiftSourceRect;
    currentRect: LayoutShiftSourceRect;
};
export type LayoutShiftEntry = {
    value: number;
    hadRecentInput: boolean;
    sources: LayoutShiftSource[];
};
export declare function layoutShiftObserverScript(): string;
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