/**
 * 从fromIndex查找符合condition的index
 * 如果 fromIndex 刚好符合condition, 则返回 fromIndex
 * 如果 没有符合要求的, 则返回 -1
 * @param arr 数组
 * @param fromIndex 起始索引
 * @param condition 查找条件
 */
export declare function findIndexFrom<T>(arr: T[], fromIndex: number, condition: (i: T) => boolean): number;
export declare function reAppend<T = any>(arr: T[], item: T): T[];
export declare function swapByProp<T>(xs: T[], propName: keyof T, v1: any, v2: any): T[];
export declare function swap<T>(xs: T[], i1: number, i2: number): T[];
export declare function dropIndex<T>(arr: T[], i: number): T[];
export declare function insertIndex<T>(arr: T[], i: number, v: T): T[];
export interface ArrayDiffs<T> {
    added: T[];
    removed: T[];
    updated: Partial<T>[];
    reserved?: T[];
}
export declare function arrayCompareBy<T extends {}>(arr1: T[], arr2: T[], id: keyof T): ArrayDiffs<T>;
export declare function arrayCompare<T extends {
    id: any;
}>(arr1: T[], arr2: T[]): ArrayDiffs<T>;
export declare function patchByDiffs<T extends {
    id: any;
}>(arr: T[], diffs: ArrayDiffs<T>): T[];
export declare function upsert<T extends {}>(arr: T[], query: (t: T) => boolean, patch: Partial<T>): T[];
export declare function insertArround<T>(arr: T[], placeholder: T | ((i: number) => T)): T[];
export declare function insertBetween<T>(arr: T[], placeholder: T | ((i: number) => T)): T[];
/**
 * 对齐到长度toLength
 * 如果长度小于toLength, 则用f填充
 * 如果长度大于toLength, 则删除多余元素
 * 如果元素为undefined, 则会填充之!
 */
export declare function padding<T>(arr: T[], toLength: number, f: ((i: number) => T) | T): T[];
/**
 * 类似于slice, 但针对string  和  array
 * sliceBy('12345', ':3') => '12'
 * sliceBy('12345', '2:4') => '23'
 * sliceBy('12345', '4:') => '45'
 */
export declare function sliceBy(s: string, slicer: {
    from?: string;
    to?: string;
}): string;
export declare function sliceBy<T>(s: T[], slicer: {
    from?: T;
    to?: T;
}): T[];
export declare function crossJoin<T1, T2>(xs: T1[], ys: T2[]): [T1, T2][];
/**
 * 是否二维数组
 *  [] => true
 *  [1, 2] => false
 *  [[1], [2]] => ture
 */
export declare const is2dArray: (arr: any) => boolean;
export declare function getNextByIndex<T extends {
    id: any;
    index: number;
}>(xs: T[], id: any): T | null;
export declare function getPrevByIndex<T extends {
    id: any;
    index: number;
}>(xs: T[], id: any): T | null;
/**
 *  按条件替换
 * @param source 要修改的源数组
 * @param patch patch数组, 见test
 * @param findFn patch中的元素, 对应到source中哪个元素? 通过findFn查找
 * @param updateFn 找到sourceEl后, 通过什么办法修改?
 * @return 修改后的数据
 */
export declare function updateBy<T>(source: T[], patch: T[], findFn: (sourceEl: T, patchEl: T) => boolean, updateFn: (sourceEl: T, patchEl: T) => T): T[];
export declare function replaceById<T extends {
    id: any;
}>(newArray: T[], baseArray: T[]): T[];
/**
 * @param arr
 * @param indexRange 如 [3,5], 表示要移动从3-5(含)的区块. 由于是区块移动, 所以看作一个整体
 * @param delta 负值左移, 正值右移 ( 注意是区块移动, indexRange 当成整体 )
 * @returns [变动后的数组, 是否变动]
 */
export declare function batchMove<T>(arr: T[], indexRange: number[], delta: number): [T[], boolean];