@buka/class-transformer-extra/dist/umd/src/number/to-big-int.d.ts

class-transformer-extra contains methods that's aren't included in the class-transform package.

import { TransformOptions } from 'class-transformer';
export interface ToBigIntTransformOptions extends TransformOptions {
    optional?: boolean;
}
/**
 * @returns BigInt Or NaN
 */
export declare function ToBigInt(options?: ToBigIntTransformOptions): PropertyDecorator;