import type * as t from '@babel/types';
export declare function tsOptionalType(typeAnnotation: t.TSType): t.TSOptionalType;
export declare function isTSOptionalType(node: t.Node | null | undefined): node is t.TSOptionalType;
export declare function assertTSOptionalType(node: t.Node | null | undefined): asserts node is t.TSOptionalType;
//# sourceMappingURL=ts-optional-type.d.ts.map