Get module from prototype | TypeScript Community | Page 1

charred fox Jul 4, 2023, 12:40 PM

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Is there a way to get the module(name) a given prototype was declared in?
E.g.

let prototype = MyType.prototype
let declaringModule = getDeclaringModule(prototype); // how would i do this

dry pasture Jul 4, 2023, 12:45 PM

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no such data is maintained, decorators might let you do that though

charred fox Jul 4, 2023, 1:04 PM

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bruh why is there so little reflection in ts

cobalt goblet Jul 4, 2023, 1:13 PM

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charred fox bruh why is there so little reflection in ts

why would you need reflection though

charred fox Jul 4, 2023, 1:14 PM

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why not

cobalt goblet Jul 4, 2023, 1:14 PM

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also there is actually a lot of reflection

charred fox Jul 4, 2023, 1:14 PM

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for a lot of stuff

cobalt goblet Jul 4, 2023, 1:14 PM

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getOwnPropertyDescriptors

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.prototype, .constructor, getPrototypeOf, Proxy

charred fox Jul 4, 2023, 1:15 PM

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thats not a ton but its nice yeah

cobalt goblet Jul 4, 2023, 1:15 PM

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that is a ton

charred fox Jul 4, 2023, 1:15 PM

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but it would be nice if ts retained declared types and modules

cobalt goblet Jul 4, 2023, 1:15 PM

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like compared to c# what is it missing

charred fox Jul 4, 2023, 1:15 PM

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types

cobalt goblet Jul 4, 2023, 1:15 PM

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typescripts goal is to not exist at runtime

charred fox Jul 4, 2023, 1:16 PM

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the prototypes of types can be referenced as runtime

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well that sucks

cobalt goblet Jul 4, 2023, 1:16 PM

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types dont exist in js

charred fox Jul 4, 2023, 1:16 PM

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prototypes

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classes

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do

cobalt goblet Jul 4, 2023, 1:16 PM

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prototypes are objects, classes are classes

charred fox Jul 4, 2023, 1:17 PM

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func(MyClass) passes the prototype of instances of MyClass to the function

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if im not stupid

cobalt goblet Jul 4, 2023, 1:17 PM

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nope

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it passes the class

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the prototype is in MyClass.prototype

charred fox Jul 4, 2023, 1:18 PM

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even better then

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also have the class

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so theres enoguh type related stuff to have type retention as metadata

cobalt goblet Jul 4, 2023, 1:18 PM

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theoretically yes

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realistically it's difficult to figure out a nice way to do this

charred fox Jul 4, 2023, 1:19 PM

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ig

cobalt goblet Jul 4, 2023, 1:19 PM

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it's easy enough to force yourself to annotate the correct types manually though

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(as in, emit an error if they're missing)

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well idk actually

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idk if esquery is powerful enough

charred fox Jul 4, 2023, 1:20 PM

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for this specifically tho i want to get the module of any class passed

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so i cant annotate every class

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becasuse some arent from my code

cobalt goblet Jul 4, 2023, 1:23 PM

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what do u need the module for anyway

charred fox Jul 4, 2023, 1:23 PM

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differentiating class names

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like nsamespace

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but automated

cobalt goblet Jul 4, 2023, 1:24 PM

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but why do you need to do that

charred fox Jul 4, 2023, 1:24 PM

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idk it seems nice

cobalt goblet Jul 4, 2023, 1:24 PM

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if you can compare the class objects directly

charred fox Jul 4, 2023, 1:25 PM

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nah im getting the name as a string

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but prefereably id want to prefix the name with the module

cobalt goblet Jul 4, 2023, 1:25 PM

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but why o.o

charred fox Jul 4, 2023, 1:26 PM

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for uniqueness in the map

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if i have @discordjs.Client and @someothermodule.Client i dont want them to conflict

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also doesnt Node print the declaring module name of a class in errors and stuff?

desert comet Jul 4, 2023, 1:34 PM

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this might seem a bit weird but you could use the class objects themselves as keys in your Map:

wanton mantleBOT Jul 4, 2023, 1:34 PM

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mkantor#0

Playground Link

Preview:```ts
type Constructor = new (...args: never[]) => unknown

class Foo {
isFoo = true
}
class Bar {
isBar = true
}

namespace SomeOtherModule {
export class Foo {
isADifferentFoo = true
}
}

const x = new Map<Constructor, {}>([
[Foo, new Foo()],
[Bar, new Bar()],
...```

charred fox Jul 4, 2023, 1:34 PM

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yeah true but i want them to optionally be accessible by a specific name too

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if you have multiple instances

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idk

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this works ig

desert comet Jul 4, 2023, 1:35 PM

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another option is to give every class that wants to participate in this scheme a name: string property and write whatever you want there. it won't be as automagic as reflection but you can include a prefix to identify the module or whatever yourself

charred fox Jul 4, 2023, 1:36 PM

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yeah id probably do smth like that with decorators if i could but i want to do this for any class

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from other modules too

desert comet Jul 4, 2023, 1:36 PM

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gotcha

cobalt goblet Jul 4, 2023, 1:45 PM

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charred fox from other modules too

Map<any class, string> for names, lol

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its easy enough to get module path tbh

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put a new method on object that throws an exception

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class.method()

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or not, since the class code wouldn't be in the stack trace

desert comet Jul 4, 2023, 1:54 PM

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you could use something from import.meta i think

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assuming ESM

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but anything like this would still require modifying the class definition, which it sounds like orbyfied doesn't want

desert comet Jul 4, 2023, 1:56 PM

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cobalt goblet put a new method on object that throws an exception

oh, unless this meant monkeypatching the class. that's clever, but yeah i don't think it'd help with this

cobalt goblet Jul 4, 2023, 1:59 PM

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desert comet oh, unless this meant monkeypatching the class. that's clever, but yeah i don't ...

nah when i said object i meant Object. but yeah unfortunately it doesnt show lines that don't execute 😔

desert comet Jul 4, 2023, 2:03 PM

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i got it. use Class.toString() as the keys. classes with exactly the same source code will collide, but, i mean, structural typing and all 🚎

#Get module from prototype