Daniel Rosenwasser @drosenwasser Twitter profile

Pinned Tweet

Daniel Rosenwasser

6 years

"There were like 77 Levenshtein distance packages on npm and all of them said they were the fastest." - @sanders_n That's why the JavaScript ecosystem is great. Everything is the best.

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Daniel Rosenwasser

@drosenwasser

2 years

It's ok if you started programming at 8. It's ok if you started programming at 38. You can still get out. Run.

Verónica 👑

@maria_fibonacci

2 years

It's ok if you started programming at 8. It's ok if you started programming at 38. There's room for everyone. Next.

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Daniel Rosenwasser

@drosenwasser

5 years

Man, JavaScript is so dumb. Check out these two built-in functions with the same name that work totally differently! > console.log("hello"); hello undefined > Math.log("hello"); NaN

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Daniel Rosenwasser

@drosenwasser

5 years

WE JUST MOVED OPTIONAL CHAINING IN JS TO STAGE 3 🎉🎉🎉🎉🎉🎉🎉

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Daniel Rosenwasser

@drosenwasser

4 years

Optional Chaining just moved to Stage 4 at TC39! 🎉 ?. is now part of ES2020!

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Daniel Rosenwasser

@drosenwasser

5 years

Hey TypeScript/JavaScript-ers - I got this started on the plane last night. Would you use this refactoring?

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Daniel Rosenwasser

@drosenwasser

5 years

Our team lead forced us to.

Una 🇺🇦

@Una

5 years

TypeScript friends: what's your #1 reason for using TypeScript?

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Daniel Rosenwasser

@drosenwasser

4 years

Please don't read into this too much I just want to turn my brain off and post dumb memes today.

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Daniel Rosenwasser

@drosenwasser

5 years

It's been 5 years today since I joined the TypeScript team - which I guess is good since every other job post asks for ~5 years of TypeScript experience.

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Daniel Rosenwasser

@drosenwasser

6 years

Debuggers don't actually remove bugs, they just run your code as slow as you can think.

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Daniel Rosenwasser

@drosenwasser

5 years

I think ~25% of any Microsoft employee's time is spent signing into different Microsoft websites.

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Daniel Rosenwasser

@drosenwasser

4 years

YOU KNOW WHAT THIS MEANS

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Daniel Rosenwasser

@drosenwasser

5 years

@ken_wheeler "Oh wow, you're from the future!? What do you do?" "I do free work so people can make websites faster." "Oh, weird, is the future like socialist or something?" "Nope, I just occasionally do free work." "For charity?" "No." "So, uh, you must really enjoy that." "Not really."

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Daniel Rosenwasser

@drosenwasser

4 years

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Daniel Rosenwasser

@drosenwasser

5 years

Optional chaining is at stage 2!!!!!!

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Daniel Rosenwasser

@drosenwasser

1 year

TypeScript/JavaScript people - what's usually causing you to need to restart VS Code/TS Server?

Ahmed Elsakaan

@ixahmedxii

1 year

Are you even a web developer if these are not your most recently run vscode commands? 🤡

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Daniel Rosenwasser

@drosenwasser

7 years

@bradlygreen just announced publicly that @typescriptlang is now one of the official languages used at @Google ! #TypeScript

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Daniel Rosenwasser

@drosenwasser

5 years

Optional chaining (TypeScript issue 16) and nullish coalescing got a big applause at #TSConf . They're the first ECMAScript features I've ever helped champion so I feel pretty great. 🥰

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Daniel Rosenwasser

@drosenwasser

5 years

Not sure if I've mentioned this but we made some of the errors better. #TSConf #TypeScript

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Daniel Rosenwasser

@drosenwasser

4 years

What made you want to rage-quit TypeScript when you started out? (╯°□°）╯︵ ┻━┻

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Daniel Rosenwasser

@drosenwasser

5 years

Looks like @fbjest is migrating to TypeScript!

[RFC] Migrate Jest to TypeScript by SimenB · Pull Request #7554 · jestjs/jest

In the lastest State of JS, the one stat that stood out to me was the number of people either using or wanting to use TypeScript (over 46.7% has used and will use it again, 33.7% wants to learn it)...

github.com

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Daniel Rosenwasser

@drosenwasser

1 year

'var' go brrrr

Switch let/const to var in the scanner & parser for top-levelish variables. by DanielRosenwasser ·...

This pull request regains some of the performance we lost in #51387 when we switched our emit from ES5 to ES2018 - a significant part due to TDZ checks that engines need to perform. These TDZ check...

github.com

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Daniel Rosenwasser

@drosenwasser

5 years

If you told me 10 years ago that my job would involve talking to lawyers at Microsoft to develop more permissive software licenses, I don't know if I'd have believed you.

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Daniel Rosenwasser

@drosenwasser

8 months

The TypeScript Documentary is out! I've been on the team for a long time now, but before that I was skeptical that TypeScript could succeed (watch the doc!) When I joined the team I realized I was wrong - we had brilliant passionate people who really understood JS & OSS.

Keyboard Stories

@kbdocumentaries

8 months

🍿 TypeScript Origins: The Documentary 👇

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Daniel Rosenwasser

@drosenwasser

6 years

It's 2018. Statically typed programming languages now compete by compiling down to JavaScript and flirting with users over Twitter.

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Daniel Rosenwasser

@drosenwasser

6 years

"I don't use types in my open source projects, keeps the barrier to entry low." Yeah I don't use tests in my open source projects, keeps the barrier to entry even lower.

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Daniel Rosenwasser

@drosenwasser

5 years

Not a lot of people know this but this was our original slogan.

Josh

@JOSH_DALEK

5 years

@alshdotme Just use Typescript you shitlord

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Daniel Rosenwasser

@drosenwasser

5 years

Me: I like the web because navigating is easy Web 3.0: What if it was like native apps? Me: Oh, no thanks Web 3.0: we did it Me: Why can't I right click and open this in a new window? Web 3.0: look it's better it's a responsive progressive SPA that uses service workers at 60fps!

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Daniel Rosenwasser

@drosenwasser

1 year

If you're using JSDoc - either for type-checking or for your editor experience - you're probably using TypeScript. Just because you're not using .ts files doesn't mean you're not using TypeScript.

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Daniel Rosenwasser

@drosenwasser

6 years

It might sound like a small thing, but it's awesome that the React team reached out to us on TypeScript (and other teams) to coordinate on JSX fragments. The collaboration we had was stellar. Shout out to @tarquinius623 for the implementation!

React

@reactjs

6 years

render() { return ( <> <h1>React v16.2 has been released!</h1> <h2>Introduces a new syntax for fragments!</h2> Thanks to all our collaborators! </> ); }

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Daniel Rosenwasser

@drosenwasser

3 years

😊

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Daniel Rosenwasser

@drosenwasser

5 years

Have you ever noticed that these icons mean **absolutely nothing at all**???

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Daniel Rosenwasser

@drosenwasser

5 years

Today I got to present nullish coalescing at TC39 and it progressed to stage 3! The cherry on top? @rkirsling already has a patch out for it in JavaScriptCore!

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Daniel Rosenwasser

@drosenwasser

3 years

JavaScript tip: when doing subtraction, I like to put the bigger argument on the left so that I don't have to subtract it from 0. // ❌ bad 0 - (small - big) // ✅ good big - small

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Daniel Rosenwasser

@drosenwasser

4 years

"Of course you can type that in TypeScript! You just need a couple of mapped types and a conditional type and-"

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Daniel Rosenwasser

@drosenwasser

5 years

@slicknet

Daniel Rosenwasser

@drosenwasser

5 years

@ken_wheeler "Oh wow, you're from the future!? What do you do?" "I do free work so people can make websites faster." "Oh, weird, is the future like socialist or something?" "Nope, I just occasionally do free work." "For charity?" "No." "So, uh, you must really enjoy that." "Not really."

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Daniel Rosenwasser

@drosenwasser

4 years

No, I'm sorry, I don't have a joke about TypeScript - maybe you need to install the right .d.ts files first?

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Daniel Rosenwasser

@drosenwasser

4 years

@sebmck @SeaRyanC It was supposed to be a surprise but I guess now's a good time as any to announce that I'm about a month into writing a TypeScript compiler in COBOL.

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Daniel Rosenwasser

@drosenwasser

7 years

Babel 7 beta now brings TypeScript support! Awesome collaboration between our teams over the last few months!

henry

@left_pad

7 years

Just published a post for the first @babeljs 7.0 beta release

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Daniel Rosenwasser

@drosenwasser

4 years

In case you missed JavaScript Twitter this past weekend.

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Daniel Rosenwasser

@drosenwasser

5 years

Funny story about this one. About a year back, we started consistently hearing that TypeScript's error messages were a huge problem. Eventually, @fdsmars , @WesleyWigham , @sheetalkamat , and I started having UX syncs.

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Daniel Rosenwasser

@drosenwasser

3 years

⚡ JavaScript tip ⚡: I like to put the property name on the right side of the dot operator. // ❌ sometimes errors??? log.console("hi") // ✅ Works! ☺️ console.log("hi")

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Daniel Rosenwasser

@drosenwasser

6 years

What are some editing features you wish you had for JavaScript & TypeScript? Quick fixes? Refactorings? In case you didn't know, @typescriptlang is the engine that powers those JavaScript features in @code and @VisualStudio , so we can make it happen!

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Daniel Rosenwasser

@drosenwasser

5 years

Sister: "good luck with your presentation on the execution of the nulls or whatever."

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Daniel Rosenwasser

@drosenwasser

5 years

@natfriedman Make it customizable like myspace and let us add auto-playing music, marquees, and custom cursors 🙃

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Daniel Rosenwasser

@drosenwasser

4 years

This is one of those UUIDs my girlfriend keeps generating right?

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Daniel Rosenwasser

@drosenwasser

5 years

Finally got around to posting my proposal for our next big UX improvement in @typescriptlang . I really think --noExplicitErrors is going to be the flag that makes TypeScript approachable for all JavaScript users.

[RFC] Improved UX via --noExplicitErrors · Issue #30689 · microsoft/TypeScript

Leading up to TypeScript 3.0, we actively sought out users across different companies to discuss their biggest pain-points with TypeScript. One common theme truly stood out: error messages and UX. ...

github.com

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Daniel Rosenwasser

@drosenwasser

8 months

When I hit a GitHub issue in this state, it's impossible to explore. Each load is impossibly slow and the UI slows down to a crawl. Is there any sort of workaround? I'd even take a raw text view if possible.

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Daniel Rosenwasser

@drosenwasser

6 years

TypeScript: welcome to flavor town.

TypeScript

@typescript

6 years

Congrats to our friends on the @babeljs team for releasing Babel 7.0! One of the biggest features in this release is support for transforming TypeScript! Read more here:

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Daniel Rosenwasser

@drosenwasser

10 months

Today we released TypeChat: an experimental library that makes it easy to get well-typed structured data! This makes it way easier to build natural language UIs: take a user request, turn it into JSON, validate with the user that it's what they want. ✅

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Daniel Rosenwasser

@drosenwasser

8 months

Please don't do this! It is harmful and unnecessarily alienates people.

Nicholas C. Zakas

@slicknet

8 months

As someone who was attacked online for days after saying that the ESLint rewrite would not be in TypeScript, I can verify that there is a fairly aggressive pro-TypeScript faction online. We need to stop attacking people for language or framework choices. It’s dumb.

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Daniel Rosenwasser

@drosenwasser

4 years

- Everyone should use this code formatter! - Why? I don't like the way it formats code. - Well it's a compromise... - But I don't like it. - Look, just use the formatter and you don't have to have arguments about code style. - But we're having the argument right now. This is it.

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Daniel Rosenwasser

@drosenwasser

4 years

"That's an interesting proposal. So which OKR are you trying to target with this?" "Huh. Well we were just trying to work on useful features. Why, what are you trying to do?"

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Daniel Rosenwasser

@drosenwasser

7 years

OH at TC39: "I don't know what you mean by a more general integer type, this one already has all the integers in it."

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Daniel Rosenwasser

@drosenwasser

5 years

2.a. Give feedback to the team so that the errors aren't bizarre anymore! We've been actively focusing on improving the UX for a while now

kitze 🚀

@thekitze

5 years

1. don't use types and waste time on fixing bugs 2. use types and waste time on fixing bizarre compiler errors

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Daniel Rosenwasser

@drosenwasser

3 years

@typescript Wow TypeScript Twitter person you're like the funniest! I can't believe you work on Sundays.

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Daniel Rosenwasser

@drosenwasser

7 years

I was tempted to work "TypesCrypt" into the tweet but I felt like my team was sufficiently embarrassed. *Anyways*, go get TypeScript 2.6!

TypeScript

@typescript

7 years

IT'S ALIVE! TypeScript 2.6 is here with spooktacular strictFunctionTypes and other scary-good features!

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Daniel Rosenwasser

@drosenwasser

5 years

Every example that uses arrays needs to be updated *right now*.

qntm

@qntm

5 years

A group of hedgehogs is called an array, which means that everything in an array is a hedgehog, I don't make the rules

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Daniel Rosenwasser

@drosenwasser

5 years

People who use classes in TypeScript/JavaScript - please give this a shot. We want to make sure we're rolling this out in the least disruptive way and we need feedback.

Nathan Shively-Sanders

@sanders_n

5 years

Big new breaking changes are coming in Typescript 3.7 to get ready for the class fields feature in Ecmascript. If you have a big OO code base you'll want to try out these two PRs NOW. Explanation follows.

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Daniel Rosenwasser

@drosenwasser

4 years

A lot of people have been excited about type-only imports/exports coming in TypeScript 3.8. The truth is that you shouldn't really need them most of the time (or maybe even ever).

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Daniel Rosenwasser

@drosenwasser

5 years

Imagine comparing someone to a Holocaust denier because you don't like JavaScript

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Daniel Rosenwasser

@drosenwasser

7 years

Our team lost about a half hour of work because I brought in fidget spinners. Sorry if your favorite feature doesn't make it to TS 2.6.

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Daniel Rosenwasser

@drosenwasser

5 years

A chart of TypeScript's growth in the State of JS Survey since 2016. Users who would use TypeScript again has jumped a decent amount every year (~13% each year, now at ~47% in 2018). Users who would not use TypeScript again has remained at just around 5%.

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Daniel Rosenwasser

@drosenwasser

2 years

@jlongster Sorry you had that experience. From the team's perspective, we recognize it's not going to be the right tool for every job. Unfortunately I think a lot of discussions online just end up attracting extreme opinions.

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Daniel Rosenwasser

@drosenwasser

5 years

Type systems don't get enough credit as signs of humility.

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Daniel Rosenwasser

@drosenwasser

7 months

Friends, in the last few days I've been sharing a lot around the massacres in Israel. No doubt, many of you feel may uncomfortable for one reason or another. Let me get into this.

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Daniel Rosenwasser

@drosenwasser

6 years

The TypeScript + Babel collaboration has been nothing but goodness. Super glad @left_pad got to visit us.

henry

@left_pad

6 years

Had a really good chat with some of the @typescriptlang team: talking about interop, our continued partnership on the TS babel plugin, TC39 proposals, and just about oss maintainance! Thanks to @drosenwasser for setting that up; awesome to finally meet you, @fdsmars , @ahejlsberg !

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Daniel Rosenwasser

@drosenwasser

2 years

Anyone given Nx a shot to manage multiple projects/monorepos? I haven't gotten the chance to use it myself, but I do really appreciate that TypeScript and the editor integration are first-class citizens.

Victor Savkin

@victorsavkin

2 years

Nx - The build system for TypeScript that TypeScript deserves. I've been working on toolable JavaScript for about 10 years, so this is something I'm excited to announce. @NxDevTools @typescript #typescript

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Daniel Rosenwasser

@drosenwasser

7 months

My stomach is in a knot over what is happening in Israel. I am horrified over the the stories and photos and videos. I am scared for my family and friends.

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Daniel Rosenwasser

@drosenwasser

1 year

@AdamRackis In order of annoying: - No non-null assertions - No type import syntax - No module-level scope for types - Can't really leave comments in your JSDoc types - "object" = "any" by default

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Daniel Rosenwasser

@drosenwasser

5 years

- Hi, just sign in! (: - No, idiot, your LIVE account, not your MICROSOFT account. - No, idiot, your MICROSOFT account, not your LIVE account. - Do you want to authenticate with these two methods or- haha JK! This is a redirect page. (: - Okay here's the correct 2FA prompt.

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Daniel Rosenwasser

@drosenwasser

4 years

Merged a nice (and overdue) improvement to TypeScript errors from @JoshuaKGoldberg . The idea is to use base types when the literal types just add noise.

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Daniel Rosenwasser

@drosenwasser

5 years

Has anyone been running into slowness with JavaScript or TypeScript in @VisualStudio or VS @code ? Feel free to DM me!

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Daniel Rosenwasser

@drosenwasser

5 years

The bang for the buck here was just great. All it takes is a few checks in error scenarios and the addition of an error message. That's incredibly cheap, and it helps *so many people* starting out with TypeScript!

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Daniel Rosenwasser

@drosenwasser

5 years

How are you using regex in your app?

Incorrectly parsing text

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I lie on Twitter polls

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Daniel Rosenwasser

@drosenwasser

6 years

rm -rf / ^ the true debugger

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Daniel Rosenwasser

@drosenwasser

2 years

Can we create an ecosystem for type artists? I've put together an RFC to explore what's possible and kickstart the discussion around this!

[RFC] Towards Non-Fungible Types · Issue #48513 · microsoft/TypeScript

For years TypeScript has strived to grow and support its community. We've seen some tremendous investment, innovation, creativity, and beauty from TypeScript developers. export type ConsistentW...

github.com

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Daniel Rosenwasser

@drosenwasser

7 years

One of the things I really liked about TS 2.3 is that we listened especially to our non-users. This drove things like --checkJs mode.

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Daniel Rosenwasser

@drosenwasser

4 years

(╯°□°）╯︵ ʇdᴉɹɔSǝdʎ┴

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Daniel Rosenwasser

@drosenwasser

5 years

Users: Give us this shitty syntax, the current way to do this is terrible. Us: We can't, that would potentially conflict with future ECMAScript proposals. Users: Then give us syntax that's so shitty that TC39 would never ever want to use it. ????????

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Daniel Rosenwasser

@drosenwasser

3 years

Many people are asking about how to combine the power of machine learning/AI with developer tools. Here is a slightly ambitious proposal for an Intelligent and Interactive TypeScript compiler.

[RFC] Towards an Intelligent and Interactive TypeScript · Issue #43491 · microsoft/TypeScript

Background One of the biggest problems for newcomers is how unapproachable build tools can be. Users often have to deal with rough compiler messages and are faced day-to-day with with harsh stateme...

github.com

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Daniel Rosenwasser

@drosenwasser

4 years

What could your editor do so that you don't have to Google stuff like this? Better quick info/signature help? Something else?

Mark Dalgleish

@markdalgleish

4 years

Me: I'm a JavaScript expert. Also me: *Googles array slice*

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Daniel Rosenwasser

@drosenwasser

6 years

"Hey @ahejlsberg , what was your favorite part about #MSBuild ?"

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Daniel Rosenwasser

@drosenwasser

5 years

At some point, someone had a really great dumb idea. All our errors get reported as error TSxxxx: Error message goes here. What if we just entered `error TS` and let Google suggest the rest?

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Daniel Rosenwasser

@drosenwasser

1 year

A follow-up to "var go brrrr"! I put together a write-up about why we switched a subset of our variables to 'var' in TypeScript and the cases in which it actually made a difference in runtime speed.

Using `var` in limited contexts to avoid runtime TDZ checks · Issue #52924 · microsoft/TypeScript

This issue aims to explain and track some optimization work within the TypeScript compiler and language service. As of TypeScript 5.0, the project's output target was switched from es5 to es201...

github.com

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Daniel Rosenwasser

@drosenwasser

4 years

@johnny_reilly @robpalmer2 Honestly, my take is that it should really just be interfaces for anything that they can model. There is no benefit to type aliases when there are so many issues around display/perf.

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Daniel Rosenwasser

@drosenwasser

4 years

@trivikram @typescript @rustlang @deno_land @rbuckton @atcb @orta @LichtmanLabs No plans, a port to Rust would lose 6 years of work on the new compiler, and API compatibility. We can't even make TypeScript asynchronous because of the API breaks and reimplementation complexity.

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Daniel Rosenwasser

@drosenwasser

5 years

@SoftSavage @duncanmak I'm pretty sure at this point it's me working for SSO.

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Daniel Rosenwasser

@drosenwasser

4 years

Lots of people unhappy about the fact that ECMAScript # privates don't use the 'private' keyword. I get it. That's why I prefix everything with 'private' anyway. Go from class C { ‍ #name = "hi"; } to class C { ‍ #privateName = "hi"; } Get the best of both worlds! (:

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Daniel Rosenwasser

@drosenwasser

5 years

Heard joke once: Man goes to TypeScript repo. Says he has a design proposal. Makes JavaScript better. Maintainer says "Witnessable runtime behavior. That's great. Find a TC39 member to champion it for you." Man bursts into tears. Says "But @‍DanielRosenwasser, *you're* on TC39!"

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Daniel Rosenwasser

@drosenwasser

5 years

How do you balance your job responsibilities with how funny you think you are?

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Daniel Rosenwasser

@drosenwasser

4 years

@hmemcpy The Language Server Protocol was inspired by TS Server and then became a community standard that the VS Code team drove. This enabled a bunch of languages like Rust and Scala to have cross-platform editor support. LSP is crucial so many dev tools nowadays.

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Daniel Rosenwasser

@drosenwasser

3 years

Not sure if I did some kind of disservice. I specifically worked to champion ?. and ?? in *JavaScript* so that they would not be weird one-off additions to TypeScript. People have still been calling them TypeScript operators.

Adam Rackis

@AdamRackis

3 years

@TejasKumar_ Indeed, but why'd you call it the TypeScript double question mark? That's vanilla JS baby!

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Daniel Rosenwasser

@drosenwasser

7 years

We just released #TypeScript 2.4! Check it out!

TypeScript

@typescript

7 years

TypeScript 2.4 is here and brings dynamic import(), string enums, and better inference! Read up on our release blog!

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Daniel Rosenwasser

@drosenwasser

6 years

Someone clearly noticed the enthusiasm in the TypeScript community 😃

Can We Use TypeScript?! Short-Sleeve Unisex T-Shirt

This makes for a great staple t-shirt. It's made of a thicker, heavier cotton, but it's still soft. And the double stitching on the neckline and sleeves add more durability to what is sure to be a...

teejungle.net

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Daniel Rosenwasser

@drosenwasser

1 year

What is this? It's a 10% reduction in parse time by swapping shared closure variables from let/const to var. Why does that happen? 'var' avoids use-before-initialization checks that engines are mandated to do.

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Daniel Rosenwasser

@drosenwasser

5 years

@sebmck Keep 'em coming.

Terrible error message for calling/constructing types · Issue #32013 · microsoft/TypeScript

https://twitter.com/sebmck/status/1141776682275049472 Suggestions This expression is not callable. Type '{0}' has no call signatures. For unions: This expression is not callable. No constit...

github.com

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Daniel Rosenwasser

@drosenwasser

6 years

If you were wondering what sort of cool stuff our summer intern was up to, here it is 🎉😎 We're hoping that this makes migrating to async/await much much easier.

Elizabeth Dinella

@eadinella

6 years

Check out my new @typescriptlang proposal for refactoring Promise methods to use async/await

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Daniel Rosenwasser

@drosenwasser

4 years

This has bothered me SO much for Node projects and I'm glad it's finally coming in 3.9.

Andrew Branch

@atcb

4 years

Of the TypeScript features I’ve worked on, this may be the one I’m personally most excited to use: better support for `require` in auto-imports for plain JS.

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Daniel Rosenwasser

@drosenwasser

4 years

@LordHanson @jntrnr @TypeScriptConf @typescript I wasn't there when the project first started either, but Luke had a great blog post about some of the history there which actually turns out to be pretty funny

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