export declare class InvalidConfiguration extends Error {
    constructor(key: string, value: any, description: string);
}
export declare function convertTimeStrToSeconds(input: string, envName: string, description?: string): number;
export declare function convertSizeToBytes(input: string, envName: string, description?: string): number;
export declare function asPortNumber(input: number, envName: string): number;
/**
 * Returns the specified data source if assertions are passed, throws
 * an error otherwise.
 * @param dataSource The data source to assert.
 */
export declare function assertDataSource(dataSource?: string): string;
/**
 * Returns data source specific environment variable name.
 */
export declare function keyByDataSource(origin: string, dataSource?: string, preAggregations?: boolean): string;
/**
 * Checks if at least one PRE_AGGREGATIONS env var is set for a given data source.
 */
export declare function hasPreAggregationsEnvVars(dataSource?: string): boolean;
declare const variables: Record<string, (...args: any) => any>;
type Vars = typeof variables;
export declare function getEnv<T extends keyof Vars>(key: T, opts?: Parameters<Vars[T]>[0]): ReturnType<Vars[T]>;
export declare function isDockerImage(): boolean;
export {};
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