import { Adapter } from './adapter';
import { Model } from '../model';
import { FileSystem } from './fileSystem';
/**
 * FileAdapter is the file adapter for Casbin.
 * It can load policy from file or save policy to file.
 */
export declare class FileAdapter implements Adapter {
    readonly filePath: string;
    protected readonly fs?: FileSystem;
    /**
     * FileAdapter is the constructor for FileAdapter.
     *
     * @param filePath filePath the path of the policy file.
     * @param fs {@link FileSystem}
     */
    constructor(filePath: string, fs?: FileSystem);
    loadPolicy(model: Model): Promise<void>;
    private loadPolicyFile;
    /**
     * savePolicy saves all policy rules to the storage.
     */
    savePolicy(model: Model): Promise<boolean>;
    private escapeCsv;
    private savePolicyFile;
    /**
     * addPolicy adds a policy rule to the storage.
     */
    addPolicy(sec: string, ptype: string, rule: string[]): Promise<void>;
    /**
     * addPolicies adds policy rules to the storage.
     This is part of the Auto-Save feature.
     */
    addPolicies(sec: string, ptype: string, rules: string[][]): Promise<void>;
    /**
     * UpdatePolicy updates a policy rule from storage.
     * This is part of the Auto-Save feature.
     */
    updatePolicy(sec: string, ptype: string, oldRule: string[], newRule: string[]): Promise<void>;
    /**
     * removePolicy removes a policy rule from the storage.
     */
    removePolicy(sec: string, ptype: string, rule: string[]): Promise<void>;
    /**
     * removePolicies removes policy rules from the storage.
     * This is part of the Auto-Save feature.
     */
    removePolicies(sec: string, ptype: string, rules: string[][]): Promise<void>;
    /**
     * removeFilteredPolicy removes policy rules that match the filter from the storage.
     */
    removeFilteredPolicy(sec: string, ptype: string, fieldIndex: number, ...fieldValues: string[]): Promise<void>;
}