NestJS Cannot resolve dependencies of the UsersModule. Error:
Error: Nest can't resolve dependencies of the UsersModule (?). Please verify whether [0] argument is available in the current context.
app.module.ts:
@Module({
imports: [
ConfigModule,
DatabaseModule,
GraphQLModule,
UsersModule,
],
providers: [
ErrorService,
],
exports: [
DatabaseModule,
ErrorService,
],
})
export class AppModule implements NestModule {}
users.module.ts:
@Module({
imports: [
DatabaseModule,
ErrorService,
],
providers: [
UsersService,
...usersProviders,
UserResolver,
],
})
export class UsersModule {
constructor(private readonly errorService: ErrorService) {}
}
Problem is this ErrorService, but for instance Database module is used in similar way, and it works without any error. I'm little confused) Maybe somebody would help. Thank you.
ErrorService
is not properly injected in UsersModule
.
It should either be:
providers
of UsersModule
exports
of one module import
ed by UsersModule
Otherwise, Nest won't be able to resolve it. And adding it to the exports
of AppModule
doesn't make it globally available, either.
I can see three solutions:
ErrorService
to the providers
of UsersModule
. But it doesn't look a proper way, as I think/guess that you will reuse this service in many other parts of the code (right?). Thus, better:ErrorsModule
which exports
the ErrorService
, then UsersModule
will import
ErrorsModule
and will be able to inject the service. Like:
// errors.module.ts
@Module({
providers: [ ErrorService ],
exports: [ ErrorService ],
})
export class ErrorsModule {}
// users.module.ts
@Module({
imports: [ErrorsModule],
})
export class UsersModule {
constructor(private readonly errorService: ErrorService) {}
}
LoggerService
be a better name? If my guess is correct), use a @Global
module that you'll import
only once in your main module (AppModule
)Example:
@Global()
@Module({
providers: [LoggerService],
exports: [LoggerService],
})
export class LoggerModule {
constructor(private readonly loggerService: LoggerService) { /* initialize logger, or whatever */ }
}
Then you must add LoggerModule
to the imports
of AppModule
, and LoggerService
will be injectable anywhere without having to re-declare it.
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