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OpraNestUtils

Utility class for OPRA–NestJS integration. Provides helpers for propagating OPRA decorator metadata from source classes to generated NestJS controller classes.

import { OpraNestUtils } from '@opra/nestjs';

Static methods​

copyDecoratorMetadata​

static copyDecoratorMetadata(target: Type, ...source: Type[]): void

Copies OPRA-related reflect-metadata entries (keys prefixed with 'opra.') from each source class to the target class, without overwriting existing keys on the target. Also merges NestJS guards (__guards__), interceptors (__interceptors__), and exception filters (__exceptionFilters__) from source classes into the target.

ParameterTypeDescription
targetTypeThe class to receive the metadata.
...sourceType[]One or more classes to copy metadata from.

Example​

import { OpraNestUtils } from '@opra/nestjs';

OpraNestUtils.copyDecoratorMetadata(GeneratedController, OriginalController);

This is used internally by @opra/nestjs-http when it generates NestJS controller classes from OPRA HttpController definitions — OPRA metadata (operation shapes, parameter declarations) and NestJS guard/interceptor metadata from the original controller class are copied onto each generated controller.