import { S3Client } from "@aws-sdk/client-s3";
import { Lambda } from "@aws-sdk/client-lambda";
interface ValidationResult {
    isValid: boolean;
    source: "lambda" | "my_prefix" | "standard" | null;
    vars?: {
        accessKeyId: string;
        secretAccessKey: string;
        region: string;
    };
    missingVars?: string[];
}
interface AWSAuth {
    AWS_ACCESS_KEY_ID: string;
    AWS_SECRET_ACCESS_KEY: string;
    AWS_REGION: string;
}
declare const validateEnvironmentVars: () => ValidationResult;
declare const initialiseS3Client: (auth?: AWSAuth | null) => S3Client;
declare const initialiseLambdaClient: (auth?: AWSAuth | null) => Lambda;
/**
 * Clears all cached AWS client instances.
 * Useful for testing or when credentials need to be refreshed.
 */
declare const clearClientCache: () => void;
export { validateEnvironmentVars, initialiseS3Client, initialiseLambdaClient, clearClientCache, AWSAuth, };