export declare type PEM = string;
export declare type ExportedKey = JsonWebKey | PEM;
export interface KeyEncoder {
    encode(key: CryptoKey): Promise<JsonWebKey>;
    decode(key: ExportedKey, algorithm: RsaHashedImportParams | AesKeyAlgorithm, usages: KeyUsage[], extractable: boolean): Promise<CryptoKey>;
}
export declare function KeyEncoder(): KeyEncoder;