import { Component } from '../component-class';
import { DOMApi, GenericReturnType } from '../types';
import { Destructors } from '../glimmer/destroyable';
import { Cell, MergedCell } from '../reactive';
import { RENDERED_NODES_PROPERTY, COMPONENT_ID_PROPERTY } from '../shared';

export type IfFunction = () => boolean;
export declare class IfCondition {
    isDestructorRunning: boolean;
    prevComponent: GenericReturnType | null;
    condition: MergedCell | Cell<boolean>;
    destructors: Destructors;
    runNumber: number;
    lastValue: boolean;
    target: DocumentFragment | HTMLElement;
    placeholder: Comment;
    throwedError: Error | null;
    destroyPromise: Promise<any> | null;
    [RENDERED_NODES_PROPERTY]: Array<Node>;
    [COMPONENT_ID_PROPERTY]: number;
    branchDomNodes: Array<Node>;
    trueBranch: (ifContext: IfCondition) => GenericReturnType;
    falseBranch: (ifContext: IfCondition) => GenericReturnType;
    api: DOMApi;
    constructor(parentContext: Component<any>, maybeCondition: Cell<boolean> | IfFunction | MergedCell, target: DocumentFragment | HTMLElement, placeholder: Comment, trueBranch: (ifContext: IfCondition) => GenericReturnType, falseBranch: (ifContext: IfCondition) => GenericReturnType);
    checkStatement(value: boolean): true | undefined;
    reInit(): Promise<void>;
    syncState(value: unknown): void;
    renderBranch(nextBranch: (ifContext: IfCondition) => GenericReturnType, runNumber: number): void;
    validateEpoch(runNumber: number): boolean;
    /**
     * Remove any DOM nodes that the previous branch render inserted between
     * its first node and the IfCondition placeholder. Used as a fallback for
     * branches whose render function does not thread results back through
     * `prevComponent` (e.g. yield-only true branches in slot mode).
     */
    removeOrphanBranchDom(): void;
    destroyBranchSync(): void;
    destroyBranch(): Promise<void>;
    renderState(nextBranch: (ifContext: IfCondition) => GenericReturnType): void;
    destroy(): Promise<void>;
    setupCondition(maybeCondition: Cell<boolean> | IfFunction | MergedCell): void;
}