Microsoft/TypeScript

TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

Shanon Jackson

@ShanonJackson

or sorry maybe with brackets

updated it

TNThacker2015

@TNThacker2015

I tried what you linked, but it gives a string type instead of a union.

Is there a way for it to be a union?

Shanon Jackson

@ShanonJackson

ahh yeah its because object literals always assume mutation, therefore they don't type {a: "bar"} as a constant they type it as {a: string}

basically you have a few options all of them involve giving the compiler more information

const objArr = [{ a: "e" as const, b: 2 }, { a: "foo" as const, b: 100 }, { a: "bar" as const, b: 100 }]

type GetA = (typeof objArr)[number]["a"] // "e" | "foo" | "bar"

const objArr = [{ a: "e", b: 2 }, { a: "foo", b: 100 }, { a: "bar", b: 100 }] as const

or using some kind of function that infers the string iteral type and not 'string' when creating an object

TNThacker2015

@TNThacker2015

that worked, thanks! :)

Shanon Jackson

@ShanonJackson

no problem

Bruce Pascoe

@fatcerberus

I’m very confused by this comment, it seems like a non sequitur https://github.com/microsoft/TypeScript/issues/34534#issuecomment-543408917

I’m not your mom, right?

What.

Keith Layne

@keithlayne

Bob's your uncle.

Bruce Pascoe

@fatcerberus

But that guy sucks

garyking

@garyking

Does anyone know how to generate a .d.ts file for a JS project that uses JSDoc, automatically? Rather than need to write it by hand, for a module.

garyking

@garyking

I'm assuming you can really only generate one by hand, which is what I've been doing so far. I'm checking this out but I've already encountered so many bugs.

Bugs which seem to mostly do with JSDoc itself.

Gerrit Birkeland

@Gerrit0

Can't you use tsc with --emitDeclarationOnly?

Keith Layne

@keithlayne

yeah allowJs and declarations are supposed to no longer be incompatible.

AnyhowStep

@AnyhowStep

Is there even a point in banning him

He'd just create another account and throw another hissy fit

AnyhowStep

@AnyhowStep

Emulated cursor documentation https://github.com/AnyhowStep/tsql/blob/master/doc/00-getting-started/16-emulated-cursor.md

Edoardo Luppi

@lppedd

Quick style question. To convert a any value to a boolean, do you prefer

Boolean(value) \\ or
!!value

Just curious. I prefer the explicit Boolean(...) alternative.

Tõnis Ostrat

@tonisostrat

depends on the context

AnyhowStep

@AnyhowStep

I prefer if (typeof value != "boolean") { throw new Error(); }

Orta

@orta

@keithlayne - re: TS in web app - yeah the default TS support with monaco only supports editing one file

You’d need to make the virtual host support more files etc

https://github.com/microsoft/vscode/blob/33fb4feb25bc7064e85f3f468bd6666cd70a1c83/extensions/html-language-features/server/src/modes/javascriptMode.ts#L1

is a pretty good example of it

Keith Layne

@keithlayne

thanks

Orta

@orta

Wow, I didn’t really know how bad android support in monaco is

you really can’t even delete

AnyhowStep

@AnyhowStep

¯_(ツ)_/¯

Why do you think I keep bugging you all for better mobile support =P

Keith Layne

@keithlayne

your dude is missing an arm

Bruce Pascoe

@fatcerberus

@orta It’s not too nice on iOS either, there’s literally no way to pull up the copy/paste UI because the custom context menu overrides it

Orta

@orta

I’m fighting the desire to go fix some of the worst offenders in monaco itself

Bruce Pascoe

@fatcerberus

@AnyhowStep ban who? I don’t know see what that was in response to

Keith Layne

@keithlayne

to the your mom dude on github

Bruce Pascoe

@fatcerberus

anthalon

@anthalon

I have an object that accepts a string parameter in it's constructor, and it's toString() formats that string in a specific way.

for instance:

export class Currency
{
    constructor(private amt: string) {}
    ...
    toString() { /* return formatted string here, comma separated etc */ }
}

amd if I use an object of this class directly, it returns the formatted string.

But when I try to parse from json, the Currency object is treated as string, and doesn't format with it's toString() method.

How can I initialize this object from json so that it's treated as a Currency object?

Keith Layne

@keithlayne

you probably know this, but that has nothing to do with TS. You're going to have to write some kind of deserialization function.

anthalon

@anthalon

the Currency class is part of a model, and it's being given a string value when the json is JSON.parsed. Instead of doing this manually, I was wondering if typescript offers some functionality to initialize these objects, maybe in a way where the string is not assigned to the object, but instead passed in as a constructor parameter?

Bruce Pascoe

@fatcerberus

All the functionality typescript adds is compile-time only, it doesn’t help you at runtime

What I think you want is a “reviver”, google “json reviver”

anthalon

@anthalon

yup, that's what I'm after. Thanks

Thanzex

@Thanzex

What are the best practices to export constants from a package?

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