export declare const backInUp: import("@angular/animations").AnimationReferenceMetadata;
export declare const backInDown: import("@angular/animations").AnimationReferenceMetadata;
export declare const backInLeft: import("@angular/animations").AnimationReferenceMetadata;
export declare const backInRight: import("@angular/animations").AnimationReferenceMetadata;
export declare const backOutUp: import("@angular/animations").AnimationReferenceMetadata;
export declare const backOutDown: import("@angular/animations").AnimationReferenceMetadata;
export declare const backOutRight: import("@angular/animations").AnimationReferenceMetadata;
export declare const backOutLeft: import("@angular/animations").AnimationReferenceMetadata;