/**
 * Given an element, returns the related input reference, if it exists respecting following priority.
 * 1. Input field in `sbb-form-field` (if trigger is undefiend)
 * 2. Input referenced by id (trigger is string)
 * 3. Input referenced directly (trigger is HTMLElement)
 * @param element The starting SbbDatepickerElement element.
 * @param trigger The id or the reference of the input.
 */
export declare function findInput(element: HTMLElement, trigger?: string | HTMLElement | null): HTMLInputElement | null;
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