Nest js cannot resolve dependencies. in Auth service

Nest can't resolve dependencies of the AuthService (?). Please verify whether [0] argument is available in the current context.

Please find my project repository

Nest-auth-test

Error: Nest can't resolve dependencies of the AuthService (?). Please verify whether [0] argument is available in the current context.
at Injector.lookupComponentInExports (/home/arpit/Documents/aquaapp/node_modules/@nestjs/core/injector/injector.js:129:19)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:182:7)
at Function.Module.runMain (internal/modules/cjs/loader.js:697:11)
at Object.<anonymous> (/home/arpit/Documents/aquaapp/node_modules/ts-node/src/_bin.ts:177:12)
at Module._compile (internal/modules/cjs/loader.js:654:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
at Module.load (internal/modules/cjs/loader.js:566:32)
at tryModuleLoad (internal/modules/cjs/loader.js:506:12)
at Function.Module._load (internal/modules/cjs/loader.js:498:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:695:10)
at startup (internal/bootstrap/node.js:201:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:516:3)
1: node::Abort() [/usr/bin/node]
2: 0x8d04d9 [/usr/bin/node]
3: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/usr/bin/node]
4: 0xb17d2c [/usr/bin/node]
5: v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/bin/node]
6: 0x2176d1e042fd
Aborted (core dumped)


1 Answer
1

Usually when you get such exception its because you are trying to inject a dependency of another module and that dependency hasn't been exported in the exports array.. Here's an example:

Lets say you have some service in module A that you want to use in module B:

@Injectable()
export class SampleService {}

@Module({
exports: [SampleService]
})
export class ModuleA {}

@Module({
imports: [ModuleA]
})
export class ModuleB {}


Keep in mind that if you import ModuleA in ModuleB and ModuleB in ModuleA you will get a circular dependency error.. I hope that helps

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