import { Construct } from 'constructs';
import { CfnElement } from './cfn-element';
import { IResolvable, IResolveContext } from './resolvable';
export interface CfnConditionProps {
    /**
     * The expression that the condition will evaluate.
     *
     * @default - None.
     */
    readonly expression?: ICfnConditionExpression;
}
/**
 * Represents a CloudFormation condition, for resources which must be conditionally created and
 * the determination must be made at deploy time.
 */
export declare class CfnCondition extends CfnElement implements ICfnConditionExpression, IResolvable {
    /**
     * The condition statement.
     */
    expression?: ICfnConditionExpression;
    /**
     * Build a new condition. The condition must be constructed with a condition token,
     * that the condition is based on.
     */
    constructor(scope: Construct, id: string, props?: CfnConditionProps);
    /**
     * @internal
     */
    _toCloudFormation(): object;
    /**
     * Synthesizes the condition.
     */
    resolve(_context: IResolveContext): any;
}
/**
 * Represents a CloudFormation element that can be used within a Condition.
 *
 * You can use intrinsic functions, such as ``Fn.conditionIf``,
 * ``Fn.conditionEquals``, and ``Fn.conditionNot``, to conditionally create
 * stack resources. These conditions are evaluated based on input parameters
 * that you declare when you create or update a stack. After you define all your
 * conditions, you can associate them with resources or resource properties in
 * the Resources and Outputs sections of a template.
 *
 * You define all conditions in the Conditions section of a template except for
 * ``Fn.conditionIf`` conditions. You can use the ``Fn.conditionIf`` condition
 * in the metadata attribute, update policy attribute, and property values in
 * the Resources section and Outputs sections of a template.
 *
 * You might use conditions when you want to reuse a template that can create
 * resources in different contexts, such as a test environment versus a
 * production environment. In your template, you can add an EnvironmentType
 * input parameter, which accepts either prod or test as inputs. For the
 * production environment, you might include Amazon EC2 instances with certain
 * capabilities; however, for the test environment, you want to use less
 * capabilities to save costs. With conditions, you can define which resources
 * are created and how they're configured for each environment type.
 *
 * You can use `toString` when you wish to embed a condition expression
 * in a property value that accepts a `string`. For example:
 *
 * ```ts
 * new sqs.Queue(this, 'MyQueue', {
 *   queueName: Fn.conditionIf('Condition', 'Hello', 'World').toString()
 * });
 * ```
 */
export interface ICfnConditionExpression extends IResolvable {
}
/**
 * Interface to specify certain functions as Service Catalog rule-specifc.
 * These functions can only be used in ``Rules`` section of template.
 */
export interface ICfnRuleConditionExpression extends ICfnConditionExpression {
    /**
     * This field is only needed to defeat TypeScript's structural typing.
     * It is never used.
     */
    readonly disambiguator: boolean;
}