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catch[This]

Lightweight and pure javascript library that returns normalized errors as values instead of throwing them

Heavily inspired by Theo’s preferred way of handling try/catch in typescript and this comment peepoLove with some added normalization, because throw undefined is a thing

Install

Install using a package manager

pnpm i catch-this

or using CDN

<script src="https://cdn.jsdelivr.net/npm/[email protected]/index.min.js"></script>

Usage

The catchThis class has 3 static methods, auto, sync and async. For most cases, use auto it detects if the function being executed is async or a sync function

Sync

Using with sync functions

import { catchThis } from 'catch-this'

let { data, error } = catchThis.auto(() => {
    //...
    return 'my result'
})

console.log(error) // undefined
console.log(data) // my result

Async

Using it with async functions a.k.a Promise

import { catchThis } from 'catch-this'

let { data, error } = await catchThis.auto(new Promise((resolve) => {
    resolve('my promise result')
}))

console.log(error) // undefined
console.log(data) // my promise result

Error normalization

All errors are normalized to a Error object MDN Reference

import { catchThis } from 'catch-this'

let { data, error } = await catchThis.auto(new Promise((_, reject) => {
    reject('promise was rejected') 
}))

console.log(error instanceof Error) // true 
console.log(error.message) // promise was rejected 

NOTE: If the error is not a object, string or Error, the error will be normalized with the message no error message