/**
 * Environment variable interpolation utility for Overmind.
 * Allows settings.json to use $VAR or ${VAR} syntax to reference values from .env
 */
type Interpolatable = string | number | boolean | null | undefined | Interpolatable[] | {
    [key: string]: Interpolatable;
};
export declare function interpolateEnvVars(obj: Interpolatable, visited?: WeakSet<object>): Interpolatable;
/** Returns the list of env var names that were referenced but not found. Resets the list. */
export declare function consumeUnresolvedVars(): string[];
export {};
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