import type { WidgetLayoutCubicBezier, WidgetLayoutSize, WidgetLayoutSizeUpdate, WidgetLayoutTimedSizeUpdate } from "./widget-layout-size-update.js";
export type WidgetLayoutComparableSizeUpdate = WidgetLayoutSizeUpdate | WidgetLayoutTimedSizeUpdate;
export type WidgetLayoutUnchangedTransitionPlan<Update extends WidgetLayoutComparableSizeUpdate = WidgetLayoutComparableSizeUpdate> = {
    kind: "unchanged";
    size: WidgetLayoutSize;
    update: Update;
    observedAtMs: number;
};
export type WidgetLayoutInstantTransitionPlan = {
    kind: "instant";
    size: WidgetLayoutSize;
    update: WidgetLayoutSizeUpdate;
    startedAtMs: number;
    settledAtMs: number;
};
export type WidgetLayoutTimedTransitionPlan = {
    kind: "timed";
    size: WidgetLayoutSize;
    update: WidgetLayoutTimedSizeUpdate;
    startedAtMs: number;
    settledAtMs: number;
};
export type WidgetLayoutInstantOnlyTransitionPlan = WidgetLayoutUnchangedTransitionPlan<WidgetLayoutSizeUpdate> | WidgetLayoutInstantTransitionPlan;
export type WidgetLayoutTransitionPlan = WidgetLayoutInstantOnlyTransitionPlan;
export type WidgetLayoutTimedCapableTransitionPlan = WidgetLayoutUnchangedTransitionPlan | WidgetLayoutInstantTransitionPlan | WidgetLayoutTimedTransitionPlan;
export type WidgetLayoutInstantTransitionPolicy = {
    kind: "instant";
    durationMs: 0;
};
export type WidgetLayoutTimedTransitionPolicy = {
    kind: "timed";
    durationMs: number;
    easing: WidgetLayoutCubicBezier;
};
export type WidgetLayoutTransitionPolicy = WidgetLayoutInstantTransitionPolicy | WidgetLayoutTimedTransitionPolicy;
/**
 * The default coordinated layout transition shared by host, View, and
 * authoring surfaces. Keep this policy in the protocol so each runtime uses
 * the same timeline and easing when it participates in a layout update.
 */
export declare const DEFAULT_WIDGET_LAYOUT_TRANSITION_DURATION_MS = 260;
export declare const DEFAULT_WIDGET_LAYOUT_TRANSITION_EASING: readonly [0.22, 1, 0.36, 1];
export declare const DEFAULT_WIDGET_LAYOUT_TRANSITION_POLICY: Readonly<{
    kind: "timed";
    durationMs: 260;
    easing: readonly [0.22, 1, 0.36, 1];
}>;
/** Internal timing for one coordinated host/View layout transaction. */
export type WidgetLayoutTransitionSchedule = {
    sequence: number;
    transactionId: string;
    startAtEpochMs: number;
};
export declare const DEFAULT_WIDGET_LAYOUT_TRANSITION_LEAD_TIME_MS = 96;
export declare function createWidgetLayoutTransitionSchedule(input: {
    sequence: number;
    transactionId: string;
    nowEpochMs: number;
    leadTimeMs?: number;
}): WidgetLayoutTransitionSchedule;
export declare function resolveWidgetLayoutTransitionDelayMs(schedule: WidgetLayoutTransitionSchedule | undefined, nowEpochMs: number): number;
export declare function resolveWidgetLayoutTransitionExecution(input: {
    schedule?: WidgetLayoutTransitionSchedule;
    durationMs: number;
    nowEpochMs: number;
}): {
    delayMs: number;
    durationMs: number;
    elapsedMs: number;
    isComplete: boolean;
    timelineOffsetMs: number;
};
/** Resolves the output of a CSS cubic-bezier timing function at a time ratio. */
export declare function resolveWidgetLayoutCubicBezierProgress(easing: readonly [number, number, number, number], timeProgress: number): number;
export declare function resolveWidgetLayoutResumedEasing(input: {
    easing: readonly [number, number, number, number];
    elapsedProgress: number;
    remainingProgress: number;
}): {
    initialProgress: number;
    progress: number;
};
export declare const INSTANT_WIDGET_LAYOUT_TRANSITION_POLICY: WidgetLayoutInstantTransitionPolicy;
export declare function getWidgetLayoutPlanNowMs(): number;
export declare function areWidgetLayoutSizeUpdatesEqual(left: WidgetLayoutComparableSizeUpdate | undefined, right: WidgetLayoutComparableSizeUpdate): boolean;
type WidgetLayoutInstantPolicyPlanInput = {
    previous?: WidgetLayoutComparableSizeUpdate;
    size: WidgetLayoutSize;
    nowMs: number;
    transitionPolicy?: WidgetLayoutInstantTransitionPolicy;
};
type WidgetLayoutTimedCapablePolicyPlanInput = {
    previous?: WidgetLayoutComparableSizeUpdate;
    size: WidgetLayoutSize;
    nowMs: number;
    transitionPolicy: WidgetLayoutTimedTransitionPolicy;
};
type WidgetLayoutOptionalPolicyPlanInput = {
    previous?: WidgetLayoutComparableSizeUpdate;
    size: WidgetLayoutSize;
    nowMs: number;
    transitionPolicy?: WidgetLayoutTransitionPolicy;
};
export declare function planWidgetLayoutTransition(input: {
    previous?: WidgetLayoutSizeUpdate;
    next: WidgetLayoutSizeUpdate;
    nowMs: number;
}): WidgetLayoutInstantOnlyTransitionPlan;
export declare function planWidgetLayoutTransition(input: {
    previous?: WidgetLayoutComparableSizeUpdate;
    next: WidgetLayoutComparableSizeUpdate;
    nowMs: number;
}): WidgetLayoutTimedCapableTransitionPlan;
export declare function planWidgetLayoutTransition(input: WidgetLayoutInstantPolicyPlanInput): WidgetLayoutInstantOnlyTransitionPlan;
export declare function planWidgetLayoutTransition(input: WidgetLayoutTimedCapablePolicyPlanInput): WidgetLayoutTimedCapableTransitionPlan;
export declare function planWidgetLayoutTransition(input: WidgetLayoutOptionalPolicyPlanInput): WidgetLayoutTimedCapableTransitionPlan;
export {};
//# sourceMappingURL=widget-layout-transition-plan.d.ts.map