/// <reference types="node" />
import { ChildProcess, ExecOptions, SpawnOptions } from 'child_process';
export { checksum } from '@xmcl/core';
export declare function missing(target: string): Promise<boolean>;
export declare function ensureDir(target: string): Promise<void>;
export interface SpawnJavaOptions {
    /**
       * The java exectable path. It will use `java` by default.
       *
       * @defaults "java"
       */
    java?: string;
    /**
       * The spawn process function. Used for spawn the java process at the end.
       *
       * By default, it will be the spawn function from "child_process" module. You can use this option to change the 3rd party spawn like [cross-spawn](https://www.npmjs.com/package/cross-spawn)
       */
    spawn?: (command: string, args?: ReadonlyArray<string>, options?: SpawnOptions) => ChildProcess;
}
export declare function ensureFile(target: string): Promise<void>;
export declare function normalizeArray<T>(arr?: T | T[]): T[];
export declare function spawnProcess(spawnJavaOptions: SpawnJavaOptions, args: string[], options?: ExecOptions): Promise<void>;
export declare function waitProcess(process: ChildProcess): Promise<void>;
/**
 * Join two urls
 */
export declare function joinUrl(a: string, b: string): string;
export interface ParallelTaskOptions {
    throwErrorImmediately?: boolean;
}
/**
 * Shared install options
 */
export interface InstallOptions {
    /**
       * When you want to install a version over another one.
       *
       * Like, you want to install liteloader over a forge version.
       * You should fill this with that forge version id.
       */
    inheritsFrom?: string;
    /**
       * Override the newly installed version id.
       *
       * If this is absent, the installed version id will be either generated or provided by installer.
       */
    versionId?: string;
}
export declare function errorToString(e: any): any;
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