Typescript: Enhance your coding experience with intelligent parameter suggestions for functions

Question

Typescript: Enhance your coding experience with intelligent parameter suggestions for functions

Within a nest.js service, there is a service method that takes an error code and generates a corresponding message to display to the user. The example below shows a simplified version of this method:

  getGenericErrorMessage(input: string): string {
    const errorMessages = {
      unknownError: 'An unknown error occurred.',
      noResponse: 'The Application did not send a response.',
    };
    return errorMessages[input] || errorMessages['unknownError'];
  }

Is there a way to enable intellisense for valid function parameters that are defined as keys in the errorMessages object? Alternatively, what is the best approach to restructure the code to achieve this functionality?

typescript visual-studio-code nestjs intellisense

Answer 1

Answer №1

To optimize your code, you can refactor by moving the errorMessages object outside of the function and utilizing the keyof keyword in the following way:

const errorMessages = {
  unknownError: 'An unknown error occurred. ',
  noResponse: 'The Application did not send a response. ',
};

function getGenericErrorMessage(input: keyof typeof errorMessages): string {
  return errorMessages[input]; // <--- // `input` must be `unknownError` or `noResponse`, so you can remove the fallback
}

If you have any questions or would like to delve deeper into this topic, feel free to leave a comment below! 🙂

Answer 2

To optimize your code, you can refactor by moving the errorMessages object outside of the function and utilizing the keyof keyword in the following way:

const errorMessages = {
  unknownError: 'An unknown error occurred. ',
  noResponse: 'The Application did not send a response. ',
};

function getGenericErrorMessage(input: keyof typeof errorMessages): string {
  return errorMessages[input]; // <--- // `input` must be `unknownError` or `noResponse`, so you can remove the fallback
}

If you have any questions or would like to delve deeper into this topic, feel free to leave a comment below! 🙂

Answer 3

Answer №2

When it comes to handling errors, I have opted for a solution using literal types. Here is a snippet showcasing how this approach is implemented:

export type ErrorType = 'connectionError' | 'timeoutError';
@Injectable()
export class ErrorHandler {
  constructor() {}
  getErrorMessage(type: ErrorType): string {
    // Assign specific error messages based on the type of error
    const errorMessages = {
      connectionError: 'An error occurred while establishing a connection.',
      timeoutError: 'The request timed out.',
    };
    return errorMessages[type];
  }
}

Answer 4

When it comes to handling errors, I have opted for a solution using literal types. Here is a snippet showcasing how this approach is implemented:

export type ErrorType = 'connectionError' | 'timeoutError';
@Injectable()
export class ErrorHandler {
  constructor() {}
  getErrorMessage(type: ErrorType): string {
    // Assign specific error messages based on the type of error
    const errorMessages = {
      connectionError: 'An error occurred while establishing a connection.',
      timeoutError: 'The request timed out.',
    };
    return errorMessages[type];
  }
}

Typescript: Enhance your coding experience with intelligent parameter suggestions for functions

Answer №1

Answer №2

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