import { Environment } from "../env.js";
/**
 * Ensures a parameter exists either from the provided value or environment variable. Favor the provided param over the environment variable when truthy.
 * @param envVarName - The name of the environment variable to check
 * @param errorMessage - The error message to throw if neither parameter nor environment variable exists
 * @param param - Optional parameter value to use instead of environment variable
 * @returns The parameter value or environment variable value
 * @throws {Error} When neither parameter nor environment variable exists
 */
export declare const getEnsuredParam: (envVarName: keyof Environment, errorMessage: string, param?: string) => string;
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