/**
 * Recursively walks a value and replaces ${{KEY}} placeholders in strings
 * with matching env values. Collects any unresolved references as errors.
 */
export declare function interpolateEnv<T>(value: T, env: Record<string, string>, unresolved: Set<string>): T;
/**
 * Recursively walks a value and replaces {{KEY}} placeholders in strings
 * with matching variable values. Collects any unresolved simple references.
 */
export declare function interpolateVars<T>(value: T, vars: Record<string, string>, unresolved: Set<string>): T;
/**
 * Scans a value tree for any remaining {{...}} patterns after interpolateVars
 * has resolved simple keys. Catches dotted paths, array indexing, and other
 * complex references that are not valid in item fields.
 */
export declare function findLeftoverVarRefs(value: unknown): string[];