export interface EnvVarLike {
    key: string;
    value: string;
}
export type ConfigStructure = Record<string, true | Record<string, true>>;
export type TransformedConfig = Record<string, string | Record<string, unknown>>;
export declare function toCamelCase(str: string): string;
export declare function getPrefix(key: string): string | null;
export declare function buildConfigStructureFromEnvKeys(keys: string[]): ConfigStructure;
export declare function transformEnvVars(vars: readonly EnvVarLike[]): TransformedConfig;