import { type ResolvedSlotOptions } from "./timing.js";
/** Internal test seam; not re-exported from the package. */
export declare function resetSlotLayoutCache(): void;
interface CharacterSlotElements {
    slot: HTMLElement;
    sizer: HTMLElement;
    previousFace: HTMLElement | null;
}
interface SlotMeasurement extends CharacterSlotElements {
    index: number;
    currentSegment: string;
    targetSegment: string;
    currentWidth: number;
    targetWidth: number;
    widthWillChange: boolean;
}
/** Render slot markup without touching animation lifecycle state. */
export declare function renderCharacterSlots(container: HTMLElement, text: string): void;
export declare function renderPlainText(container: HTMLElement, text: string): void;
export declare function getCharacterSlots(container: HTMLElement): HTMLElement[];
export declare function isSlotLayoutReady(slot: HTMLElement | undefined): boolean;
/**
 * Check the globally imported stylesheet contract. A successful check is
 * cached because an applied stylesheet does not normally disappear. A failed
 * check is retried so asynchronously loaded CSS can upgrade plain text later.
 */
export declare function canRenderSlotLayout(): boolean;
export declare function addMissingCharacterSlots(container: HTMLElement, characterSlots: HTMLElement[], requiredSlotCount: number): void;
export declare function measureCharacterHeight(container: HTMLElement, characterSlots: HTMLElement[], containerStyle: CSSStyleDeclaration): number;
/** Measure all old widths, apply all target sizers, then read all new widths. */
export declare function measureChangedSlots(characterSlots: HTMLElement[], currentSegments: string[], targetSegments: string[], skipUnchanged: boolean): SlotMeasurement[];
export declare function prepareSlotAnimation(measurement: SlotMeasurement, targetSegmentCount: number, characterHeight: number, options: ResolvedSlotOptions): {
    measurement: SlotMeasurement;
    timing: import("./timing.js").GlyphTiming;
    widthTiming: import("./timing.js").WidthTiming;
    incomingFace: HTMLSpanElement;
    completionTimeMs: number;
};
export declare function scheduleSlotAnimation(preparedAnimation: ReturnType<typeof prepareSlotAnimation>, characterHeight: number, restingColor: string, options: ResolvedSlotOptions, scheduleTask: (callback: () => void, delayMs: number) => void): void;
export {};