import type { Construct } from 'constructs';
import { UserData } from '../user-data';
/**
 * Common options across all generations.
 */
export interface AmazonLinuxImageSsmParameterCommonOptions extends AmazonLinuxImageSsmParameterBaseOptions {
    /**
     * What edition of Amazon Linux to use
     *
     * @default AmazonLinuxEdition.Standard
     */
    readonly edition?: AmazonLinuxEdition;
    /**
     * CPU Type
     *
     * @default AmazonLinuxCpuType.X86_64
     */
    readonly cpuType?: AmazonLinuxCpuType;
}
/**
 * Base options for amazon linux ssm parameters
 */
export interface AmazonLinuxImageSsmParameterBaseOptions {
    /**
     * Whether the AMI ID is cached to be stable between deployments
     *
     * By default, the newest image is used on each deployment. This will cause
     * instances to be replaced whenever a new version is released, and may cause
     * downtime if there aren't enough running instances in the AutoScalingGroup
     * to reschedule the tasks on.
     *
     * If set to true, the AMI ID will be cached in `cdk.context.json` and the
     * same value will be used on future runs. Your instances will not be replaced
     * but your AMI version will grow old over time. To refresh the AMI lookup,
     * you will have to evict the value from the cache using the `cdk context`
     * command. See https://docs.aws.amazon.com/cdk/latest/guide/context.html for
     * more information.
     *
     * Can not be set to `true` in environment-agnostic stacks.
     *
     * @default false
     */
    readonly cachedInContext?: boolean;
    /**
     * Adds an additional discriminator to the `cdk.context.json` cache key.
     *
     * @default - no additional cache key
     */
    readonly additionalCacheKey?: string;
    /**
     * Initial user data
     *
     * @default - Empty UserData for Linux machines
     */
    readonly userData?: UserData;
}
/**
 * Base properties for an Amazon Linux SSM Parameter
 */
export interface AmazonLinuxImageSsmParameterBaseProps extends AmazonLinuxImageSsmParameterBaseOptions {
    /**
     * The name of the SSM parameter that contains the AMI value
     */
    readonly parameterName: string;
}
export declare abstract class AmazonLinuxImageSsmParameterBase implements IMachineImage {
    private readonly props;
    private readonly cachedInContext;
    constructor(props: AmazonLinuxImageSsmParameterBaseProps);
    getImage(scope: Construct): MachineImageConfig;
}
/**
 * What generation of Amazon Linux to use
 */
export declare enum AmazonLinuxGeneration {
    /**
     * Amazon Linux
     */
    AMAZON_LINUX = "amzn",
    /**
     * Amazon Linux 2
     */
    AMAZON_LINUX_2 = "amzn2",
    /**
     * Amazon Linux 2022
     */
    AMAZON_LINUX_2022 = "al2022",
    /**
     * Amazon Linux 2023
     */
    AMAZON_LINUX_2023 = "al2023"
}
/**
 * Interface for classes that can select an appropriate machine image to use
 */
export interface IMachineImage {
    /**
     * Return the image to use in the given context
     */
    getImage(scope: Construct): MachineImageConfig;
}
/**
 * Configuration for a machine image
 */
export interface MachineImageConfig {
    /**
     * The AMI ID of the image to use
     */
    readonly imageId: string;
    /**
     * Operating system type for this image
     */
    readonly osType: OperatingSystemType;
    /**
     * Initial UserData for this image
     */
    readonly userData: UserData;
}
/**
 * The OS type of a particular image
 */
export declare enum OperatingSystemType {
    LINUX = 0,
    WINDOWS = 1,
    /**
     * Used when the type of the operating system is not known
     * (for example, for imported Auto-Scaling Groups).
     */
    UNKNOWN = 2
}
/**
 * CPU type
 */
export declare enum AmazonLinuxCpuType {
    /**
     * arm64 CPU type
     */
    ARM_64 = "arm64",
    /**
     * x86_64 CPU type
     */
    X86_64 = "x86_64"
}
/**
 * Amazon Linux edition
 */
export declare enum AmazonLinuxEdition {
    /**
     * Standard edition
     */
    STANDARD = "standard",
    /**
     * Minimal edition
     */
    MINIMAL = "minimal"
}
/**
 * Virtualization type for Amazon Linux
 */
export declare enum AmazonLinuxVirt {
    /**
     * HVM virtualization (recommended)
     */
    HVM = "hvm",
    /**
     * PV virtualization
     */
    PV = "pv"
}
/**
 * Available storage options for Amazon Linux images
 * Only applies to Amazon Linux & Amazon Linux 2
 */
export declare enum AmazonLinuxStorage {
    /**
     * EBS-backed storage
     */
    EBS = "ebs",
    /**
     * S3-backed storage
     */
    S3 = "s3",
    /**
     * General Purpose-based storage (recommended)
     */
    GENERAL_PURPOSE = "gp2"
}