error: Uncaught RangeError: Maximum call stack size exceeded

[Faeq-F]

I'm trying to create a new project using glen. I am using the following code:

pub fn main() {
  glen.serve(8000, fn(_req) {
    "<h1>Welcome to my webpage!</h1>
    <p>Make yourself at home 😄</p>"
    |> glen.html(status.ok)
    |> promise.resolve
  })
}

with the following gleam.toml:

name = "app"
version = "1.0.0"
target = "javascript"
[javascript]
runtime = "deno"

[dependencies]
gleam_stdlib = ">= 0.34.0 and < 2.0.0"
glen = ">= 2.2.0 and < 3.0.0"
gleam_http = ">= 3.6.0 and < 4.0.0"
gleam_javascript = ">= 0.11.0 and < 1.0.0"
repeatedly = ">= 2.1.1 and < 3.0.0"

[dev-dependencies]
gleeunit = ">= 1.0.0 and < 2.0.0"

when I do gleam run I get

Compiled in 0.05s
    Running app.main
error: Uncaught RangeError: Maximum call stack size exceeded

If I downgrade glen, I still get this error. I don't know if I am missing something basic

[MystPi]

Hey, thanks for the report. Could you share your entire program code (including imports)?

[Faeq-F]

My code was:

import gleam/javascript/promise.{type Promise}
import glen
import glen/status

pub fn main() {
  glen.serve(8000, fn(_req) {
    "<h1>Welcome to my webpage!</h1>
    <p>Make yourself at home 😄</p>"
    |> glen.html(status.ok)
    |> promise.resolve
  })
}

the code from the ReadMe does not work either;

import gleam/javascript/promise.{type Promise}
import glen
import glen/status

pub fn main() {
  glen.serve(8000, handle_req)
}

fn handle_req(req: glen.Request) -> Promise(glen.Response) {
  "<h1>Welcome to my webpage!</h1>
  <p>Make yourself at home 😄</p>"
  |> glen.html(status.ok)
  |> promise.resolve
}

They both produce the same error

[MystPi]

That's really strange, since the code is working on my platform (Ubuntu WSL on Windows). What versions of Gleam and Deno are you using? Personally I'm on Deno 1.43.3 and gleam 1.4.1.

[Faeq-F]

I'm on Windows using gleam 1.3.2 and Deno 1.45.5

deno 1.45.5 (release, x86_64-pc-windows-msvc)
v8 12.7.224.13
typescript 5.5.2

[MystPi]

I would maybe try upgrading Gleam, though I kinda doubt that's the issue. Deno version doesn't change anything on my machine either.

Also—I can't remember how the compiler does this—is that the full error you shared, or is it truncated? It would be very helpful to know where it's coming from.

[Faeq-F]

Updating gleam:

scoop update gleam
gleam: 1.4.1 (latest version)
Latest versions for all apps are installed! For more information try 'scoop status'

Running the project:

gleam run
  Compiling gleam_stdlib
  Compiling gleam_http
  Compiling gleam_javascript

warning: Deprecated type used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:53:23
   │
53 │ pub fn dereference(a: Reference(a)) -> a
   │                       ^^^^^^^^^^^^ This type has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge

warning: Deprecated type used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:57:25
   │
57 │ pub fn set_reference(a: Reference(a), b: a) -> a
   │                         ^^^^^^^^^^^^ This type has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge

warning: Deprecated type used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:61:32
   │
61 │ pub fn make_reference(a: a) -> Reference(a)
   │                                ^^^^^^^^^^^^ This type has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge

warning: Deprecated type used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:64:30
   │
64 │ pub fn update_reference(ref: Reference(a), f: fn(a) -> a) -> a {
   │                              ^^^^^^^^^^^^ This type has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge

warning: Deprecated value used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:65:15
   │
65 │   let value = dereference(ref)
   │               ^^^^^^^^^^^ This value has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge

warning: Deprecated value used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:66:3
   │
66 │   set_reference(ref, f(value))
   │   ^^^^^^^^^^^^^ This value has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge

warning: Deprecated type used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:72:27
   │
72 │ pub fn reference_equal(a: Reference(a), b: Reference(a)) -> Bool
   │                           ^^^^^^^^^^^^ This type has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge

warning: Deprecated type used
   ┌─ C:\dev\FYP\app\build\packages\gleam_javascript\src\gleam\javascript.gleam:72:44
   │
72 │ pub fn reference_equal(a: Reference(a), b: Reference(a)) -> Bool
   │                                            ^^^^^^^^^^^^ This type has been deprecated

It was deprecated with this message: The Reference type is being removed
from this packge
  Compiling conversation
  Compiling filepath
  Compiling gleam_json
  Compiling gleam_community_colour
  Compiling gleam_community_ansi
  Compiling gleeunit
  Compiling marceau
  Compiling glen
  Compiling repeatedly
  Compiling app

warning: Unused imported type
  ┌─ C:\dev\FYP\app\src\app.gleam:1:34
  │
1 │ import gleam/javascript/promise.{type Promise}
  │                                  ^^^^^^^^^^^^ This imported type is never used

Hint: You can safely remove it.
   Compiled in 0.35s
    Running app.main
error: Uncaught RangeError: Maximum call stack size exceeded

[MystPi]

That's a tough one! I can't immediately tell what's going on unfortunately. I can only think that it must be an issue with Windows, but I'm not at all sure why that could be.

[Faeq-F]

ok, that's understandable, thank you for having a look. I will try to use a different environment like WSL

[Faeq-F]

I just installed Ubuntu WSL and gleam & deno on it, and it works, thank you

[MystPi]

I'm glad it works for you! I'm not sure what the problem with Windows is; it would be nice for it to work on all platforms. I'll have to do some investigation.