How to use the cause function from verror

Verror.cause is a function in a Node.js module that returns the underlying cause of an error, if it exists.

How does verror.cause work?

Verror.cause works by inspecting the cause property of an error object, which can be used to store a reference to the underlying cause of an error. When an error is created using Verror, the underlying cause can be specified using the cause option. If the error object has a cause property, verror.cause() returns the value of this property. If the error does not have a cause property, verror.cause() returns null. This can be useful in situations where it is necessary to trace the origin of an error, such as when handling errors in complex systems or distributed applications. By maintaining a reference to the underlying cause of an error, developers can more easily identify the source of the problem and take appropriate corrective action.

Ai Example

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const VError = require("verror");

// Create a new error with a cause
const causeError = new Error("Oops!");
const error = new VError(
  {
    cause: causeError,
    name: "CustomError",
    info: { key: "value" },
    causeWasRemote: true,
  },
  "An error occurred"
);

// Get the underlying cause of the error
const cause = VError.cause(error);

// Output the result to the console
console.log(cause);

In this example, we use VError to create a new error object (error) with a cause (causeError). We then use VError.cause() to retrieve the underlying cause of the error, which in this case is the causeError object that we specified when creating the error. We output the result of VError.cause() to the console, which will be the causeError object.