TS1219

error TS1219: Experimental support for decorators is a feature that is subject to change in a future release. Set the ‘experimentalDecorators’ option in your ‘tsconfig’ or ‘jsconfig’ to remove this warning.

Broken Code ❌

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import {Injectable} from '@nestjs/common';

@Injectable()
export class AppService {
  getHello(): string {
    return 'Hello World!';
  }
}

Fixed Code ✔️

Simply set “experimentalDecorators” to true in your “tsconfig.json” file. As long as decorators are experimental you will also have to install the reflect-metadata package to shim the upcoming Metadata Reflection API for ECMAScript. For proper functionality the “emitDecoratorMetadata” option should also be set to true.