/**
 * Minimal secret input string resolver for RemoteClaw fork.
 *
 * The full secret-provider pipeline was gutted (Middleware Boundary Principle),
 * but config fields still carry SecretRef objects ({source, provider, id}) and
 * template strings ("${ENV_VAR}"). This stub handles the two common cases:
 *   1. Plain string values (returned as-is).
 *   2. SecretRef with source:"env" — resolved from process.env.
 *   3. Template strings like "${VAR}" — resolved from process.env.
 */
export declare function resolveSecretInputString(params: {
    config?: unknown;
    value: unknown;
    env?: NodeJS.ProcessEnv;
    normalize?: (value: string) => string | undefined;
    onResolveRefError?: (error: unknown) => void;
}): Promise<string | undefined>;