What is the correct way to handle errors in TypeScript when using Axios?

Question

What is the correct way to handle errors in TypeScript when using Axios?

I've got this code snippet that's currently working:

                try {
                    self.loadingFrameMarkup = true;
                    const { data }: AxiosResponse<IMarkupFrameData> = yield axios.post<IMarkupFrameData>(
                        Endpoints.LoadMarkupFrame,
                        {
                            studyID: self.studyID,
                            frameIndex: frameIndex,
                        }
                    );

                    result = {
                        ...data,
                        layers: data.layers.filter((it) => it),
                    };
                    self.loadingFrameMarkup = false;
                } catch (error: AxiosError | Error) {
                    if (error?.response?.status === 401) {
                        self.state = QueueState.Unauthorized;
                    } else {
                        self.state = QueueState.Failure;
                    }
                }

typescript-eslint is flagging an error: Catch clause variable type annotation must be 'any' or 'unknown' if specified.ts(1196) (alias) interface AxiosError<T = unknown, D = any>

What should be the error type in Axios?

typescript axios typescript-typings

Answer 1

Answer №1

When handling errors in the catch block, it is not possible to directly specify the type definition of the error. For more information on this topic, you can refer to this source. The recommended approach is to define the type within the catch block, like so:

catch (err) {
       if ((error as AxiosError)?.response?.status === 401) {
             self.state = QueueState.Unauthorized;
           } else {
              self.state = QueueState.Failure;
         }
     }

Answer 2

When handling errors in the catch block, it is not possible to directly specify the type definition of the error. For more information on this topic, you can refer to this source. The recommended approach is to define the type within the catch block, like so:

catch (err) {
       if ((error as AxiosError)?.response?.status === 401) {
             self.state = QueueState.Unauthorized;
           } else {
              self.state = QueueState.Failure;
         }
     }

Answer 3

Answer №2

One approach you could take is to

    attempt {
        ...
        ...
        ...
    } catch (error) {
      print(error as AxiosError)
      // or
      // const error = error as AxiosError
    }

Answer 4

One approach you could take is to

    attempt {
        ...
        ...
        ...
    } catch (error) {
      print(error as AxiosError)
      // or
      // const error = error as AxiosError
    }

Answer 5

Answer №3

In TypeScript, the types are only present during the compilation process. Once the code is compiled, it all boils down to plain JavaScript with no types.

Implementing type filters on catch clauses would necessitate checking the types of errors at runtime, but there isn't a foolproof method for doing so. As a workaround, it's best to simply assign the error to any or unknown and then perform a cast if needed.

catch (error: Error | any){
/// code
}

Answer 6

In TypeScript, the types are only present during the compilation process. Once the code is compiled, it all boils down to plain JavaScript with no types.

Implementing type filters on catch clauses would necessitate checking the types of errors at runtime, but there isn't a foolproof method for doing so. As a workaround, it's best to simply assign the error to any or unknown and then perform a cast if needed.

catch (error: Error | any){
/// code
}

What is the correct way to handle errors in TypeScript when using Axios?

Answer №1

Answer №2

Answer №3

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