Nest JS Cannot read property of undefined

Question

My application was working fine, and it stopped after trying to get the documentation with swagger, i think it may be a dependency issue, but can't find it anywhere.

I keep getting the error

10:10:22 PM - Starting compilation in watch mode...

Error Cannot read property 'getSymbol' of undefined

I don't know where getSymbol is used, and the error doesn't seem to help much. Hope someone can help me fix this issue. The complete application code can be found at:

https://github.com/JSLearningCode/enderecosAlunosAPI

Any help is welcome.

EDIT: Running in dev mode I got this output:

/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/typescript/lib/typescript.js:95877 throw e; ^

TypeError: Cannot read property 'getSymbol' of undefined at Object.isArray (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/utils/ast-utils.js:6:25) at getTypeReferenceAsString (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/utils/plugin-utils.js:12:21) at Object.getTypeReferenceAsString (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/utils/plugin-utils.js:31:29) at ControllerClassVisitor.createTypePropertyAssignment (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/visitors/controller-class.visitor.js:51:44) at ControllerClassVisitor.createDecoratorObjectLiteralExpr (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/visitors/controller-class.visitor.js:38:18) at ControllerClassVisitor.addDecoratorToNode (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/visitors/controller-class.visitor.js:29:22) at visitNode (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/visitors/controller-class.visitor.js:16:29) at visitNodes (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/typescript/lib/typescript.js:70998:48) at Object.visitEachChild (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/typescript/lib/typescript.js:71266:355) at visitNode (/home/william/Documentos/lemobs/enderecosAlunosAPI/node_modules/@nestjs/swagger/dist/plugin/visitors/controller-class.visitor.js:18:23) error Command failed with exit code 1.

William Guilherme · Accepted Answer · 2020-02-21 20:25:21Z

2

There was an issue related to the routing in the application. I had a parser inside the controller that was used for directing correct routes between a route "aluno" with first Param. Once I had taken the route with no params and put it first at the controller, there was no need anymore for the parser, and the issue was gone. Hope this answer helps more people if they get the same problem.

answered Feb 21, 2020 at 20:25

William Guilherme

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Comments

Terry · Accepted Answer · 2023-12-28 06:36:22Z

0

This solution is not working right now. Because nestjs swagger plugin is updated.

Old answer:

Please check your method result type of controller

Change this:

@Contoller()
export class MyController {

// ...
  async myMethod() {
    return {}
  }
}

to:

@Contoller()
export class MyController {

// ...
  async myMethod():Promise<any> {
    return {}
  }
}

edited Dec 28, 2023 at 6:36

answered Sep 18, 2020 at 7:29

Terry

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