Nest: Cannot inject into middleware

[szkumorowski]

TypeError: Cannot set property 'oAuthServer' of undefined

@Component() export class OAuth2Server implements OnModuleInit

`@Middleware()
export class OAuth2Middleware implements NestMiddleware {

private logger: Logger = LoggerFactory.getLogger(this.constructor.name);


constructor(@Inject('OAuth2Server') private readonly oAuthServer: OAuth2Server) {
}

async resolve(...args: any[]): Promise<ExpressMiddleware> {
    return (req, res, next) => {
        next();
    };
}

}`

export class AuthModule implements NestModule { public configure(consumer: MiddlewaresConsumer) { consumer .apply(OAuth2Middleware) .forRoutes(..) } }

[kamilmysliwiec]

Hi @szkumorowski,
We need a little bit more context. This part looks fine.

[szkumorowski]

Even so, there is problem with middlewares itself, actually any of examples in relation to middleware doesn't work except direct functions. Class resolve method is not executed.

` @ Middleware()
export class LoggerMiddleware implements NestMiddleware {

constructor() {
    console.log('constructor');
}

resolve(...args: any[]): ExpressMiddleware {
    console.log('resolve');
    return (req, res, next) => {
        console.log('Request...');
        next();
    };
}

}`

export class AuthModule implements NestModule { configure(consumer: MiddlewaresConsumer): void { consumer.apply(LoggerMiddleware).forRoutes( { path: '/**', method: RequestMethod.POST }, ); } }

Server is not responding.
Logs:
constructor

Nothing more.

[kamilmysliwiec]

I have tested 01-cats-app example right now, which has the same middleware. Everything is working fine, we still need more context

[szkumorowski]

tsconfig.json "target": "es5" - cause the problem

[EreckGordon]

I experienced this same issue, but was due to having multiple tsconfig files in my project -- front end uses es5 target and is named tsconfig.json so ts-node picked it up for my dev server. changing index.js to

require('ts-node').register({project: 'nestjs.tsconfig.json'});
require('./server');

with project being whatever your alternate tsconfig file's name.

[kamilmysliwiec]

This PR https://github.com/nestjs/docs.nestjs.com/pull/43 adds a warning that target: es6 is required.

[sebilasse]

As a new user I would expect a sentence in the Documentation / "First Steps" telling me what is needed in tsconfig.json like

{
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "target": "es6"
}

[lock[bot]]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.