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ErrorScript: Building a TypeScript Feature That Should (Probably) Be Rejected

Presentation byJames Haworth Wheatman

I built ErrorScript: TypeScript with "Safe" Exceptions. Unhandled exceptions and dropped promises become part of the type system and raise compile-time errors.

It works. It feels native. And it probably shouldn’t exist.

This talk explores what ErrorScript reveals about how we model failure in code, how language design influences behaviour, and the trade-offs that make this feature unlikely to be adopted.

Presented at these Events
Cover Photo for JSMonthly London May Meetup #206
Wed, May 20th · 5PMIn-Person

JSMonthly London May Meetup #206

Primary Photo for JavaScript Monthly London MeetupJavaScript Monthly London Meetup
Presented with these Guilds
Cover Photo for JavaScript Monthly London Meetup
Primary Photo for JavaScript Monthly London Meetup

JavaScript Monthly London Meetup

Javascript evolution has sped up (a lot) in recent years and event the most veterans developers find it hard to keep up with the latest trends. This meetup group aims to bring you monthly bite-sized updates on the world of Javascript along with a healthy dose of nice people, beer and pizza.

  • Please use your full name when registering, as some of our venues require a full list of attendees beforehand. You have an idea and you want to be a speaker?

We are always looking for more speakers - submit your talk here (https://docs.google.com/forms/d/e/1FAIpQLSdFaatfveOUbrmer47jYb5J4J4ttxAFc1CgTjUDltBXmDOJmg/viewform)

1.2KMembers
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When it comes to composing business logic into services, we've had our fair share of how to do, structure, organize, and call them from within our application. It's especially difficult without opinionated frameworks and the (not so great) native error handling of JavaScript. Especially when it comes to Promises. In my talk, discover how to structure services that gracefully handle errors (with type safety), how to work with promises in a predictable way and how monads can make your life easier.

About Joe: I'm a Lead Software Engineer and a huge DX enthusiast since everybody seems to only care about UX (what about us? 😢) I've started working with TypeScript around 3-4 years ago and I'm not sure whether that's a good thing or not 🙃.

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Join our community today!

Sponsor Logo for {0}

Don't let broken lines of code, busted API calls, and crashes ruin your app. Join the 4M developers and 90K organizations who consider Sentry “not bad” when it comes to application monitoring. Use code “guild” for 3 free months of the team plan.

https://sentry.io

ErrorScript: Building a TypeScript Feature That Should (Probably) Be Rejected

Presentation byJames Haworth Wheatman

I built ErrorScript: TypeScript with "Safe" Exceptions. Unhandled exceptions and dropped promises become part of the type system and raise compile-time errors.

It works. It feels native. And it probably shouldn’t exist.

This talk explores what ErrorScript reveals about how we model failure in code, how language design influences behaviour, and the trade-offs that make this feature unlikely to be adopted.

Presented at these Events
Cover Photo for JSMonthly London May Meetup #206
Wed, May 20th · 5PMIn-Person

JSMonthly London May Meetup #206

Primary Photo for JavaScript Monthly London MeetupJavaScript Monthly London Meetup
Presented with these Guilds
Cover Photo for JavaScript Monthly London Meetup
Primary Photo for JavaScript Monthly London Meetup

JavaScript Monthly London Meetup

Javascript evolution has sped up (a lot) in recent years and event the most veterans developers find it hard to keep up with the latest trends. This meetup group aims to bring you monthly bite-sized updates on the world of Javascript along with a healthy dose of nice people, beer and pizza.

  • Please use your full name when registering, as some of our venues require a full list of attendees beforehand. You have an idea and you want to be a speaker?

We are always looking for more speakers - submit your talk here (https://docs.google.com/forms/d/e/1FAIpQLSdFaatfveOUbrmer47jYb5J4J4ttxAFc1CgTjUDltBXmDOJmg/viewform)

1.2KMembers
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We all love using TypeScript but sometimes the try/catch loop gets too complicated. Let's see how we can leverage the type system that Rust uses to make our errors look cleaner and better.

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Cover Photo for Radical Pessimism

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Learn how Attio's TypeScript codebase handles errors and loading in a type-safe, functional inspired way.

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When it comes to composing business logic into services, we've had our fair share of how to do, structure, organize, and call them from within our application. It's especially difficult without opinionated frameworks and the (not so great) native error handling of JavaScript. Especially when it comes to Promises. In my talk, discover how to structure services that gracefully handle errors (with type safety), how to work with promises in a predictable way and how monads can make your life easier.

About Joe: I'm a Lead Software Engineer and a huge DX enthusiast since everybody seems to only care about UX (what about us? 😢) I've started working with TypeScript around 3-4 years ago and I'm not sure whether that's a good thing or not 🙃.

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Cover Photo for ss

ss

When it comes to composing business logic into services, we've had our fair share of how to do, structure, organize, and call them from within our application. It's especially difficult without opinionated frameworks and the (not so great) native error handling of JavaScript. Especially when it comes to Promises. In my talk, discover how to structure services that gracefully handle errors (with type safety), how to work with promises in a predictable way and how monads can make your life easier.

About Joe: I'm a Lead Software Engineer and a huge DX enthusiast since everybody seems to only care about UX (what about us? 😢) I've started working with TypeScript around 3-4 years ago and I'm not sure whether that's a good thing or not 🙃.

Je Pantazidis

Platform Sponsors

Sponsor Logo for {0}

Torc is a community-first platform bringing together remote-first software engineer and developer opportunities from across the globe. Join a network that’s all about connection, collaboration, and finding your next big move — together.

Join our community today!

Sponsor Logo for {0}

Don't let broken lines of code, busted API calls, and crashes ruin your app. Join the 4M developers and 90K organizations who consider Sentry “not bad” when it comes to application monitoring. Use code “guild” for 3 free months of the team plan.

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