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TypeScript 5.0

devblogs.microsoft.com

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Re: TypeScript 5.0

#131

Post by madeofpalk »

i_am_toaster wrote: post #115

I’m always surprised by how much others like typescript. Out of all the languages I have to use, typescript is the one that feels the most like pulling teeth. Maybe I just don’t know how bad it truly was to work with a really large JavaScript project without types and that’s why people love it, but without that experience it just feels like all the hassle of types without most of their benefits.

I'm curious about what languages you're comparing it to. My other experience is with C# and Go, and I find Typescript's type system to be much more expressive and natural to work with.

Re: TypeScript 5.0

#132

Post by [deleted] »

endisneigh wrote: post #50

I have a strange take - I think Typescript types are better most other languages, including Java, C++ and Go. It's strange since TypeScript is adding types to a weakly typed language. If we could push JavaScript performance to be another order of magnitude faster it wouldn't be necessary to use other languages, imho. Of course, pushing it that far without effectively creating a new one would be difficult, to say the…

[deleted]

Re: TypeScript 5.0

#133

Post by silasdavis »

slooonz wrote: post #121
RyanCavanaugh wrote: post #55

Earlier quoted context omitted.

In TypeScript, type guards are considered to be exhaustive, so if you have a string | number and check it against a function that says it returns "x is number", then TypeScript will think that in the negative case, it's a string. If isInteger was marked as a type guard, then you could write code like this: function f(s: string | number) { if (!Number.isInteger(s)) { console.log(s.substring(0, 0)); } } which is clearl…

How is it wrong ?

If s is a non-integer number

Re: TypeScript 5.0

#134

Post by madeofpalk »

deckard1 wrote: post #49
swyx wrote: post #5

> How? There are a few notable improvements we’d like to give more details on in the future. But we won’t make you wait for that blog post. the typescript project continues to set the bar extremely high in terms of changelog and clear communication. love you so much, drosenwasser and co!! > Decorators are an upcoming ECMAScript feature that allow us to customize classes and their members in a reusable way. huh. i tho…

I don't think decorators being a proposal matters at this point. I know I've been using them for 5+ years now, and libraries such as NestJS already use them extensively. If you like them, you're probably already drowning in them. Me, personally, I could take them or leave them.

NestJS uses the previous, incompatible decorators implementation IIRC.

Re: TypeScript 5.0

#135

Post by [deleted] »

endisneigh wrote: post #50

I have a strange take - I think Typescript types are better most other languages, including Java, C++ and Go. It's strange since TypeScript is adding types to a weakly typed language. If we could push JavaScript performance to be another order of magnitude faster it wouldn't be necessary to use other languages, imho. Of course, pushing it that far without effectively creating a new one would be difficult, to say the…

[deleted]

Re: TypeScript 5.0

#136

Post by olingern »

RyanCavanaugh wrote: post #102
throw_m239339 wrote: post #91

Earlier quoted context omitted.

> Without Angular, we may very well not have TypeScript today. Typescript was started at Microsoft by the guy who designed Turbo Pascal and C#, so completely independently from Google's Angular team. Angular had its own "AtScript" and eventually ditched that. Typescript had experimental decorator support well before Angular Team moved from AtScript, because it was a ECMAScript proposal. Angular had zero influence in…

(I have worked on the TypeScript team since before its initial release) While it's true that TS would have been started with or without Angular, I think OP is largely correct in the influence that Angular's embrace of TS had in TS's long-term success. It's difficult to see these days, but if you were watching TypeScript's adoption numbers back when Angular made its TypeScript announcement, there is a marked inflectio…

I chose TypeScript for a large project for the first time in early ~2018 and had no idea how much history I had missed. I presumed that the adoption was the other way around and that TypeScript was chosen because it fit the project's needs, but just as grandparent and parent suggest, AtScript was very much a thing.

Talk excerpt talking about Angular directives ~8 years ago! https://youtu.be/lGdnh8QSPPk?t=275

Re: TypeScript 5.0

#137

Post by ggregoire »

i_am_toaster wrote: post #115

I’m always surprised by how much others like typescript. Out of all the languages I have to use, typescript is the one that feels the most like pulling teeth. Maybe I just don’t know how bad it truly was to work with a really large JavaScript project without types and that’s why people love it, but without that experience it just feels like all the hassle of types without most of their benefits.

Your experience probably differs from people who like TS. Personally I don't feel any hassle from using it and I couldn't even start listing all the benefits it offers. Even for very small personal projects, first thing I do is installing TS.

Not saying it's your case, but I noticed that a lot of people who hate TS like to use techniques and patterns that are usually considered bad practices, which often trigger errors in TS. Mutating an object to add a new property, mutating an array to add an element of a different type, processing apples and oranges in the same function without using generics or the correct union type, etc. Code works but TS doesn't like it and forces them to rewrite it properly and it feels like a hassle with no benefits.

I also noticed that lot of people who don't like TS think they need to type everything (every variable, every function's return... which is obviously inconvenient) instead of relying on types inference. There is usually very little to type in TS (compared to Java or C# for example). The two main things are the parameters of your named functions and your external data (i.e. the fetch responses). Almost everything else can be inferred.

I also observed that some people refuse to use VSCode (or any code editor with a good TS support). So they don't see any of the benefits while coding and think it's totally useless.

Re: TypeScript 5.0

#139

Post by hn_throwaway_99 »

i_am_toaster wrote: post #115

I’m always surprised by how much others like typescript. Out of all the languages I have to use, typescript is the one that feels the most like pulling teeth. Maybe I just don’t know how bad it truly was to work with a really large JavaScript project without types and that’s why people love it, but without that experience it just feels like all the hassle of types without most of their benefits.

FWIW, when I first started getting into TypeScript from plain JS in 2019, I had a similar feeling. Part of it was that I was dealing with some object types of libraries I was using that were already quite complex. And, given all of the advancements in TS over the past few years, writing new types can be quite difficult - there is just a ton there. E.g. TypeScript's type language is famously turing complete.

That said, I absolutely love TypeScript, even just for small personal projects. The value I get from VSCode typeahead, and being able to look up the expected fields on, for example, parameters or return values of a function is invaluable, never mind its power in refactoring.

I guess I would recommend that, if in the beginning, you feel a bit overwhelmed by TS and can't yet see its value, just give it some time. At least, that's what happened to me.

Re: TypeScript 5.0

#140

Post by armacham »

dimitropoulos wrote: post #92
no_wizard wrote: post #86

Earlier quoted context omitted.

>Today, we just have TypeScript. Well. I do know one company that uses ReasonML (or isn't it called Rescript now?) One company outside Meta?

yes! haha. They love it. I ping them and see if they want to identify themselves.

FB migrated all of its ReScript to Flow and deleted the ReScript.
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