export declare type Action = ('-A' | '-C' | '-D' | '-I' | '-R');
export declare type Protocol = ('tcp' | 'udp' | 'all');
export declare type Port = [number, Protocol];
export interface Rule {
    action?: Action;
    protocol?: Protocol;
    src?: string;
    dst?: string;
    dport?: string;
    sport?: string;
    in?: string;
    out?: string;
    chain?: string;
    target?: string;
}
export declare type RuleReducer = (rule?: Rule) => Rule;
export declare const allow: RuleReducer;
export declare const reject: RuleReducer;
export declare const append: RuleReducer;
export declare const check: RuleReducer;
export declare const insert: RuleReducer;
export declare const deleteRule: RuleReducer;
export declare const onInput: RuleReducer;
export declare const onForward: RuleReducer;
export declare const onOutput: RuleReducer;
export declare const tcp: RuleReducer;
export declare const udp: RuleReducer;
export declare const toPort: ([port, protocol]: [number, "all" | "udp" | "tcp"]) => RuleReducer;
export declare const fromPort: ([port, protocol]: [number, "all" | "udp" | "tcp"]) => RuleReducer;
export declare const toPortNumberRange: (startPort: number, endPort: number) => (rule?: Rule) => Rule;
export declare const fromPortNumberRange: (startPort: number, endPort: number) => (rule?: Rule) => Rule;
export declare const toInterface: (networkInterface: string) => RuleReducer;
export declare const fromInterface: (networkInterface: string) => RuleReducer;
export declare const block: RuleReducer;
export declare function reduceRule(ruleReducers: RuleReducer[], initial?: Rule): Rule;
export default function iptables(rule: (Rule | RuleReducer)): Promise<number>;
export declare function iptablesIdempotent(rule: Rule): Promise<void>;