export interface FilterResult {
    score: number;
}
export declare abstract class TreeItem<I extends object = {}, C extends TreeItem = C> {
    readonly key: string;
    children: import("mobx/lib/types/observablearray").IObservableArray<C>;
    info: ItemInfo & I;
    lastFilterResult?: FilterResult;
    parent?: TreeItem;
    constructor(key: string, info: I, children?: C[]);
    readonly visible: boolean;
    /**
     * Returns maximum subtree score
     */
    readonly score: number;
    readonly flat: (this | C)[];
    readonly depth: number;
    abstract filter<O>(query: string, options: O, engine: QueryEngine<O>): void;
    resetFilter(): void;
}
export interface ItemInfo {
    order?: number;
}
export interface TextItemInfo extends ItemInfo {
    text: string;
}
export declare class TextItem<T extends object = {}, C extends TreeItem = C> extends TreeItem<TextItemInfo & T, C> {
    InfoType: T;
    lastFilterResult?: FilterResult & {
        match: number[];
    };
    readonly text: string;
    filter<O>(query: string, options: O, engine: QueryEngine<O>): void;
}
export declare class Tree<Item extends TreeItem, E> {
    children: import("mobx/lib/types/observablearray").IObservableArray<Item>;
    ext: E;
    constructor(items?: Item[], ext?: (tree: Tree<Item, {}>) => E);
    readonly flat: Item[];
    filter<O>(query: string, options: O, engine: QueryEngine<O>): void;
    resetFilter(): void;
}
export interface QueryEngine<O> {
    Options: O;
    score(text: string, query: string, options?: O): number;
    match(text: string, query: string, options?: O): number[];
}
export declare type TreeItemWithSelection = TreeItem<{
    selected?: boolean;
}>;
export declare class TreeNavigation<I extends TreeItemWithSelection> {
    private tree;
    static ext: <I_1 extends TreeItem<{
        selected?: boolean | undefined;
    }, {}>>(tree: Tree<I_1, any>) => TreeNavigation<I_1>;
    private index;
    current: I | undefined;
    constructor(tree: Tree<I, any>);
    setIndex(index: number): void;
    reset(): void;
    private modify;
    down(): number;
    up(): number;
}
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