question: how to serialize instances of native error classes

[lsg551]

Just started using class-transformer and tried to serialize error instances but only got empty objects.

import "reflect-metadata"
import { instanceToPlain } from "class-transformer"

const err = new RangeError("test")
const plain = instanceToPlain(err)

I expected plain to be something like {name: "RangeError", message: "test"} (or with a stack trace message). Unfortunately, it returned an empty object {}.

Inheriting from the Error class like

class TestError extends Error {
    constructor(message: string) {
        super(message)
        this.name = TestError
    }
}

const err = new TestError("test")
const plain = instanceToPlain(err)

includes at least the name prop (it returns {name: "TestError"}) but has no other props at all.

[jingyiliu]

facing same problem, any update?

[lsg551]

Somewhat late, but here's my reply: Unfortunately no. We tested several different alternatives, but all of them came with other bottlenecks and edge cases not being covered.
serialize-error seems promising. (But when I tested it a year ago, it did not suit our specific use case. However, it might be well enough for your use case.)

Haven't found a satisfying solution yet. But you better head out to dedicated solutions, fork or contribute to them.