NestJS authentication guard is malfunctioning

While implementing jwt with @nestjs/passport, I followed the instructions to use @UseGuards(AuthGuard()). However, I encountered the following exception:

common_1.Optional is not a function

Any ideas on what could be causing this issue?

Dependencies:

"@nestjs/common": "^5.0.0",

"@nestjs/core": "^5.0.0",
"@nestjs/cqrs": "^5.1.1",
"@nestjs/jwt": "^0.2.0",
"@nestjs/mongoose": "^5.1.0",
"@nestjs/passport": "^5.1.0",
"@nestjs/swagger": "^2.4.4",
"@nestjs/typeorm": "^5.2.2",
"automapper-ts": "^1.9.0",
"config": "^2.0.1",
"fastify-formbody": "^2.0.0",
"lodash": "^4.17.10",
"mongodb": "^3.1.6",
"mongoose": "^5.2.9",
"mysql": "^2.16.0",
"nestjs-rmq": "^0.1.3",
"nestjs-typegoose": "^5.0.1",
"passport": "^0.4.0",
"passport-jwt": "^4.0.0",
"reflect-metadata": "^0.1.12",
"rxjs": "^6.0.0",
"typegoose": "^5.4.0",
"typeorm": "^0.2.7",
"typescript": "^2.6.2",
javascriptexpressauthenticationnestjs

Answer №1

Your dependencies are not up to date. You might want to consider executing the command npm update.

Answer №2

Maybe there is some confusion around the question, but when using a guard, you have the option to provide a guard instance or simply provide the class and let Nest create the instance for you. It's important to note that a guard is not a function.

@UseGuards(AuthGuard()) can be written as: @UseGuards(new AuthGuard()) or @UseGuards(AuthGuard)

Answer №4

issue with dependencies

solution to consider:

$ sudo npm install -g npm-check

$ npm-check -u

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