47 lines
2.0 KiB
Markdown
47 lines
2.0 KiB
Markdown
# DOMException
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An implementation of the DOMException class from NodeJS
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NodeJS has DOMException built in, but it's not globally available, and you can't require/import it from somewhere.
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This package exposes the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class that comes from NodeJS itself. (including all of the legacy codes)
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<sub>(plz don't depend on this package in any other environment other than node >=10.5)</sub>
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```js
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import DOMException from 'node-domexception'
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import { MessageChannel } from 'worker_threads'
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async function hello() {
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const port = new MessageChannel().port1
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const ab = new ArrayBuffer()
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port.postMessage(ab, [ab, ab])
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}
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hello().catch(err => {
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console.assert(err.name === 'DataCloneError')
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console.assert(err.code === 25)
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console.assert(err instanceof DOMException)
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})
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const e1 = new DOMException('Something went wrong', 'BadThingsError')
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console.assert(e1.name === 'BadThingsError')
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console.assert(e1.code === 0)
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const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
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console.assert(e2.name === 'NoModificationAllowedError')
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console.assert(e2.code === 7)
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console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
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```
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# Background
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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 dose for you and exposes it.<br>
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This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.<br>
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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 hole class from the ground up.
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The DOMException is used in many places such as the Fetch API, File & Blobs, PostMessaging and more. <br>
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Why they decided to call it **DOM**, I don't know
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Please consider sponsoring if you find this helpful
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