class-transformer/types/decorators/transform.decorator.d.ts

Proper decorator-based transformation / serialization / deserialization of plain javascript objects to class constructors

import { TransformFnParams, TransformOptions } from '../interfaces';
/**
 * Defines a custom logic for value transformation.
 *
 * Can be applied to properties only.
 */
export declare function Transform(transformFn: (params: TransformFnParams) => any, options?: TransformOptions): PropertyDecorator;