What is the process for attaching the stack when initializing and throwing errors separately in JavaScript?

In all the documentation I've read, it consistently advises to both throw and initialize errors on the same line. For example:

throw new Error("My error");

But what if you were to first initialize the error and then throw it on separate lines?

For instance, when creating a new error instance like so:

const myErrorInstance = new Error("Defined error"); // Initialization

And later throwing that instance within a function:

throw myErrorInstance; // Throwing it

I wonder, does the stack get attached when the error instance is initialized or when it's actually thrown?

Answer №1

Generating the error in the same place it is thrown is important because that's when it receives its stack trace.

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