import { MaybeRefOrGetter, Ref } from 'vue';
export interface UseAutosizeOptions {
    textarea: Ref<HTMLTextAreaElement | null>;
    /** Hidden span mirroring the draft; its width is the single-line width. */
    measure: Ref<HTMLElement | null>;
    /** The grid laying the textarea out beside the fixed controls. */
    controls: Ref<HTMLElement | null>;
    /** Elements that share the inline row with the textarea. */
    fixed: () => (HTMLElement | null | undefined)[];
    value: MaybeRefOrGetter<string>;
    minHeight: MaybeRefOrGetter<number>;
    maxHeight: MaybeRefOrGetter<number>;
}
export interface UseAutosizeReturn {
    /** True once the draft has to take a row of its own above the controls. */
    expanded: Ref<boolean>;
    remeasure: () => void;
}
/**
 * Grows the composer textarea with its content and decides when the draft has
 * outgrown the inline row. Private to `TxPromptBar`: it is coupled to that
 * component's grid, not a general-purpose autosize.
 */
export declare function useAutosize(options: UseAutosizeOptions): UseAutosizeReturn;