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set-error-message

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    set-error-message

Properly update an error's message


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Node Browsers TypeScript Codecov Minified size Mastodon Medium

Properly update an error's message.

In V8 (Chrome, Node.js, Deno, etc.), error.stack includes error.message. However, if error.message is modified, error.stack might not be updated and still contain the previous message.

This library fixes it by setting error.message while updating error.stack accordingly. This works on any JavaScript engine.

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Example

Without set-error-message:

const error = new Error('one')
console.log(error.message) // 'one'
console.log(error.stack) // 'Error: one ...'

error.message = 'two'
console.log(error.message) // 'two'
console.log(error.stack) // 'Error: one ...'

With set-error-message:

import setErrorMessage from 'set-error-message'

const error = new Error('one')
console.log(error.message) // 'one'
console.log(error.stack) // 'Error: one ...'

setErrorMessage(error, 'two')
console.log(error.message) // 'two'
console.log(error.stack) // 'Error: two ...'

Install

npm install set-error-message

This package works in both Node.js >=18.18.0 and browsers.

This is an ES module. It must be loaded using an import or import() statement, not require(). If TypeScript is used, it must be configured to output ES modules, not CommonJS.

API

setErrorMessage(error, newMessage)

error Error | any
newMessage string
Return value: Error

Sets error.message = newMessage.

Returns error. If error is not an Error instance, it is converted to one.

Support

For any question, don't hesitate to submit an issue on GitHub.

Everyone is welcome regardless of personal background. We enforce a Code of conduct in order to promote a positive and inclusive environment.

Contributing

This project was made with ❤️. The simplest way to give back is by starring and sharing it online.

If the documentation is unclear or has a typo, please click on the page's Edit button (pencil icon) and suggest a correction.

If you would like to help us fix a bug or add a new feature, please check our guidelines. Pull requests are welcome!

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Last updated on 28 Oct 2023

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