What is node-domexception?
The node-domexception package provides a way to handle DOMException objects in Node.js environments, similar to how they are handled in web browsers. This package is useful for projects that need to simulate browser-like handling of exceptions, particularly in testing environments or server-side applications that interact with web APIs.
What are node-domexception's main functionalities?
Creating DOMException objects
This feature allows developers to create instances of DOMException with a custom message and name, mimicking the behavior seen in web browsers. It is particularly useful for throwing and catching specific types of exceptions in Node.js applications.
const DOMException = require('node-domexception');
const exception = new DOMException('An error occurred', 'NotFoundError');
console.log(exception.name); // Outputs: NotFoundError
console.log(exception.message); // Outputs: An error occurred
Checking instance of DOMException
This feature enables developers to check if an object is an instance of DOMException. This is useful for error handling and control flow in applications that need to differentiate between exception types.
const DOMException = require('node-domexception');
const exception = new DOMException('Failed operation', 'SecurityError');
if (exception instanceof DOMException) {
console.log('Caught a DOMException');
}
Other packages similar to node-domexception
domexception
The 'domexception' package is very similar to 'node-domexception' and provides a way to create DOMException objects in non-browser environments. It closely mimics the standard behavior of DOMExceptions in web browsers, making it a direct competitor to node-domexception.
DOMException
An implementation of the DOMException class from NodeJS
NodeJS has DOMException built in (from v10.5), but it is not easily available... you can't require or import it from somewhere (unless you use node v17 - at which point it got added to global scope)
This package exposes the DOMException
class that comes from NodeJS itself. (including all of the legacy codes)
Install
npm install node-domexception
npm install node-domexception@1.x
v2.x now depend on global atob
to obtain DOMException
from a error.
which also binds it to NodeJS v16+ (at which point atob
become globally available).
This NodeJS dependency/export free solution is better for cross env platform solutions.
it no longer have any cjs or esm exports and it's attached to globalThis.DOMException only if needed.
v1.x used a older tech which depended on node:worker_threads
to obtain
DOMException
which works all the way down to NodeJS v10.5+
If you are not supporting older NodeJS versions (before v17) then you won't need this package at all.
My personal recommendation is that you update to a newer NodeJS version.
This pkg will likely be deprecated once v18 becomes LTS
import 'node-domexception'
globalThis.DOMException || await import('node-domexception')
import { MessageChannel } from 'worker_threads'
try {
const port = new MessageChannel().port1
const ab = new ArrayBuffer()
port.postMessage(ab, [ab, ab])
} catch (err) {
console.assert(err.name === 'DataCloneError')
console.assert(err.code === 25)
console.assert(err.constructor === DOMException)
}
const e1 = new DOMException('Something went wrong', 'BadThingsError')
console.assert(e1.name === 'BadThingsError')
console.assert(e1.code === 0)
const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
console.assert(e2.name === 'NoModificationAllowedError')
console.assert(e2.code === 7)
console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
Background
The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws a DOMException and catch the constructor. This is exactly what this package does for you and exposes it.
This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.
The instanceof check would not have worked with a custom class such as the DOMException provided by domenic which also is much larger in size since it has to re-construct the whole class from the ground up.
The DOMException is used in many places such as the Fetch API, File & Blobs, PostMessaging and more.
Why they decided to call it DOM, I don't know
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