import { Field } from 'contensis-core-api';
import { EntryAsset } from 'contensis-delivery-api';
export type FieldAssertion = (field: Field) => boolean;
export declare class ContentTypeFieldValidationAssertions {
    /** For a canvas field with the "kitchen sink" configuration */
    static IsAllowedTypesAll: FieldAssertion;
    static IsRequired: FieldAssertion;
    static HasMinLength: FieldAssertion;
    static HasMaxLength: FieldAssertion;
    static HasRegex: FieldAssertion;
    static IsAltTextRequired: FieldAssertion;
    static HasImageDimensions: FieldAssertion;
    static HasAllowedContentTypes: (field: Field) => field is Field & {
        validations: {
            allowedContentTypes: {
                contentTypes: string[];
            };
        };
    };
    static ImageDimensions: (field: Field, image: EntryAsset) => string | true;
}