/**
 * Environment variable resolution service.
 *
 * Resolves ${VAR} and ${VAR:-default} patterns in step values.
 */
/**
 * Resolve environment variables in a string value.
 * Supports ${VAR} and ${VAR:-default} syntax.
 */
export declare function resolveEnvString(value: string, env: Readonly<Record<string, string>>): string;
/**
 * Recursively resolve environment variables in step objects.
 */
export declare function resolveEnv<T>(steps: T, env: Readonly<Record<string, string>>): T;
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