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promise-catcher
TypeScript icon, indicating that this package has built-in type declarations

0.4.2 • Public • Published

Promise Catcher

Simple promise try catch wrapper written in Typescript. Suggestions are welcome.

Installation

You can grab the latest version via NPM.

npm install --save promise-catcher

Then use require through Typescript.

import * as catcher from 'promise-catcher'

The Problem

When using ES6 promises with packages that do not catch your async rejections you may be familiar with this error.

(node:) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id:): RequestError:

To solve this we need to wrap our calls in try catch statements to make sure we are handling them correctly.

//Using callbacks in express
app.get('/url', () => {
    return async (req, res, next) => {
        try{
            
            if (problem){
                throw new Error('message')
            }
            
        }catch(err){
            next(err)
            return
        }
        next()
    }
}())
//Using throws in jasmine
describe('Test', () => {
    it('test', () => {
        return async done => {
            try{
                
                if (problem){
                    throw new Error('message')
                }
                
            }catch(err){
                throw err
            }
            done()
        }
    }())
})

Our Solution

This package contains convenience functions that wrap your async functions in try catch and pass the error onwards properly.

import * as catcher from 'promise-catcher'
 
//Using callbacks in express
app.get('/url', catcher.express(async (req, res, next) => {
    
    if (problem){
        throw new Error('message')
    }
    
    next()
}))
//Using throws in jasmine
describe('Test', catcher.jasmine(async done => {
 
    if (problem){
        throw new Error('message')
    }
 
    done()
}))
//Use with any callbacks
catcher.wraps(...)
 
//Use with any throwing
catcher.throws(...)

Readme

Keywords

Package Sidebar

Install

npm i promise-catcher

Repository

github.com/Vmlweb/Vladiator

Homepage

github.com/Vmlweb/Vladiator#readme

Weekly Downloads

1

Version

0.4.2

License

MIT

Last publish

Collaborators

  • victor96
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