/// <reference types="node" />
export declare class FileCache {
    private app;
    get folder(): string;
    private prerequisites;
    /**
     * @see https://stackoverflow.com/a/45242825
     * @param targetFullPath {string}
     */
    judgeFilePathValid(targetFullPath: string): boolean;
    get(filePathOrName: string): Promise<false | Buffer | null>;
    set(filePathOrName: string, content: Buffer | string): Promise<boolean>;
    append(filePathOrName: string, content: Buffer | string, options?: Partial<{
        useNewLineOnEOF: boolean;
    }>): Promise<boolean>;
    exists(filePathOrName: string, content?: Buffer | string): Promise<boolean>;
    remove(filePathOrName: string, content?: Buffer | string, options?: Partial<{
        useContentReplaceAllMode: boolean;
    }>): Promise<boolean>;
    clear(filePathOrName?: string, options?: Partial<{
        useEmptyContentMode: boolean;
    }>): Promise<boolean>;
}