@nestjs/common/decorators/core/catch.decorator.js

Decorators, pipes, exceptions and utilities for NestJS applications: @Controller(), @Injectable(), @Body(), ValidationPipe, HttpException and more.

import { CATCH_WATERMARK, FILTER_CATCH_EXCEPTIONS } from '../../constants.js';
/**
 * Decorator that marks a class as a Nest exception filter. An exception filter
 * handles exceptions thrown by or not handled by your application code.
 *
 * The decorated class must implement the `ExceptionFilter` interface.
 *
 * @param exceptions one or more exception *types* specifying
 * the exceptions to be caught and handled by this filter.
 *
 * @see [Exception Filters](https://docs.nestjs.com/exception-filters)
 *
 * @usageNotes
 * Exception filters are applied using the `@UseFilters()` decorator, or (globally)
 * with `app.useGlobalFilters()`.
 *
 * @publicApi
 */
export function Catch(...exceptions) {
    return (target) => {
        Reflect.defineMetadata(CATCH_WATERMARK, true, target);
        Reflect.defineMetadata(FILTER_CATCH_EXCEPTIONS, exceptions, target);
        // Filters are looked up by instance, and the "constructor" of a prototype
        // does not always lead back to the decorated class (mixin helpers
        // overwrite it, class decorators may return a Proxy of the class).
        const { prototype } = target;
        if (prototype) {
            Reflect.defineMetadata(FILTER_CATCH_EXCEPTIONS, exceptions, prototype);
        }
    };
}