export declare type AwsCredentialConfig = AwsCredentialsConfig | AwsAssumedRoleCredentialsConfig | AwsECSCredentialsConfig;
export declare function isBasicAwsCredentials(creds: AwsCredentialConfig): creds is AwsCredentialsConfig;
export declare function isAssumedRoleCredentials(config: AwsCredentialConfig): config is AwsAssumedRoleCredentialsConfig;
export declare function isEcsCredentials(config: AwsCredentialConfig): config is AwsECSCredentialsConfig;
export interface AwsCredentialsConfig {
    /**
     * AWS access key id to use for AWS authentication.
     */
    accessKeyId: string;
    /**
     * AWS secret key to use for AWS authentication.
     */
    accessSecret: string;
    /**
     * AWS session token to use for AWS STS authentication.
     */
    sessionToken?: string;
    awsAccountId?: string;
}
export interface AwsAssumedRoleCredentialsConfig extends AwsCredentialsConfig {
    /**
     * If specified, the provided access key/secret will be used as master credentials to assume the provided
     * role (which can be of a different AWS account), using the STS AssumeRole API.
     *
     * assumeRoleSessionName must also be specified for this to take effect.
     */
    assumeRoleArn: string;
    /**
     * If assumeRoleArn is specified, this will be used as a diagnostic string (i.e., in CloudTrail logs) to identify
     * the client that is assuming the role. This should be something descriptive, like `foo-service-local-dev-iang`.
     * It does not need to be unique.
     */
    assumeRoleSessionName: string;
}
export interface AwsECSCredentialsConfig {
    /**
     * Instruct this library that the caller has ECS IAM roles for tasks enabled
     * in the runtime environment, so no explicit credentials are passed in.
     *
     * The only valid value for this is true, this is for documentation purposes.
     * It makes clear that the consumer is opting to use the ECS task role
     * temporary credentials.
     *
     * For more information on ECS IAM roles for Tasks, see
     * https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-iam-roles.html
     *
     * Also see https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/ECSCredentials.html
     */
    useTaskRole: true;
}