npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

await-handler-ts

v2.0.2

Published

Basic wrapper for await that allows handling of errors without try/catch blocks

Downloads

32

Readme

await-handler-ts

Simple signature to ease the paid of catching errors using async/await. This module will allow a simple method of catching errors from an await handler without the need to wrap everything in try/catch blocks. This module is a Node.js only version based on await-to-js minus the typescript aspect. Credit for this module goes to Dima Grossman, as it was based off the code provided.

You continue to use async/await normally, except to wrap the function you are "awaiting", in this module to allow destructuring the returned array into variables. This is similar to the golang error handling syntax.

NOTE: This module works in Node 6+, but in order to use async/await, you need to use Node 8+ or compile with Babel.

THIS ADD SUPPORT FOR TYPESCRIPT OF THE AWAIT-HANDLER MADE BY KyleRoss

Install

Install via NPM:

npm i await-handler --save

Install via YARN:

yarn add await-handler

Usage

JS

const on = require('await-handler');

async function asyncFunctionExample() {
    let [err, result] = await on(myAsyncTask());
    if(err) {
        throw err;
    }
    
    // ... handle the result
    console.log(result);
}

ES import

import on from "await-handler";

TS

import on from "await-handler";
async function asyncFunctionExample() {
    let [err, result] = await on(myAsyncTask());
    if(err) {
        throw err;
    }
    
    // ... handle the result
    console.log(result);
}

// with errorProps
async function asyncFunctionExampleWithErrorProps() {
    let [err, result] = await on<{props: string}, string>(myAsyncTask(), {props: "hey"});
    if(err) {
        console.log(err.props); // "hey"
        throw err;
    }
    
    // ... handle the result
    console.log(result);
}

// You can defined the type of the error adn the data by doing: 
async function asyncFunctionExampleWithErrorPropsAndDataType() {
    // the error will be of type Error or MyCustomError
    // the data will be of type string
    let [err, result] = await on<Error | MyCustomError, string>(myAsyncTask());
    if(err) {
        throw err; // err instanceof Error || err instanceof MyCustomError
    }
    
    // ... handle the result
    console.log(result); // result instanceOf string
}

API

on(promise[, errorProps])

Type: Function

Adds handler to promise in order to return an array which can be destructured. Optionally add additional properties to the returned error by providing an Object to errorProps.

| Argument | Required? | Type | Description | |------------|-----------|---------|------------------------------------------------------------| | promise | Yes | Promise | Promise to wrap and return results for. | | errorProps | No | Object | Optional object to append to the Error if one is thrown. |

Generic

on<errorType, dataType>() {};

Examples:

async function basicExample() {
    let [err, result] = await on(myAsyncTask());
    if(err) throw err;
    
    // ... handle the result
    console.log(result);
}

async function errorPropsExample() {
    let [err, result] = await on(myAsyncTask(), { customMessage: 'Something failed!' });
    // With typescript
    let [err, result] = await on<{customMessage: string}>(myAsyncTask(), { customMessage: 'Something failed!' })
    if(err) {
        console.error(err.customMessage);
        return process.exit(1);
    }
    
    // ... handle the result
    console.log(result);
}
Returns {Promise<Array>}

Returns Promise that resolves with array signature [error, results]. If an error is thrown, error will be the the rejection from the promise and results will be undefined. If an error is not thrown, error will be null and results will be the resolved value from the promise.


Tests

To run the tests:

npm install
npm run test

License

MIT License. See License in the repository.