/**
 * <p>An object representing a constraint on task placement. For more information, see <a href="https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-placement-constraints.html">Task Placement Constraints</a> in the <i>Amazon Elastic Container Service Developer Guide</i>.</p>
 */
export interface _PlacementConstraint {
    /**
     * <p>The type of constraint. Use <code>distinctInstance</code> to ensure that each task in a particular group is running on a different container instance. Use <code>memberOf</code> to restrict the selection to a group of valid candidates. The value <code>distinctInstance</code> is not supported in task definitions.</p>
     */
    type?: "distinctInstance" | "memberOf" | string;
    /**
     * <p>A cluster query language expression to apply to the constraint. You cannot specify an expression if the constraint type is <code>distinctInstance</code>. For more information, see <a href="https://docs.aws.amazon.com/AmazonECS/latest/developerguide/cluster-query-language.html">Cluster Query Language</a> in the <i>Amazon Elastic Container Service Developer Guide</i>.</p>
     */
    expression?: string;
}
export declare type _UnmarshalledPlacementConstraint = _PlacementConstraint;