Deno language server stops working in VS Code

After some random time the language server stops working and I suddenly get code errors like this:

An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.deno-ts(2705)

An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.deno-ts(2705)

(Even when I use "deno.enablePaths": [ "src" ] in settings.json) Increasing "deno.documentPreloadLimit" (to something like 10000) just delays the problem a little bit. the language server output:

Starting Deno language server...
  version: 1.36.3 (release, x86_64-unknown-linux-gnu)
  executable: /home/nox/.deno/bin/deno
Connected to "Visual Studio Code" 1.81.1
  Auto-resolved configuration file: "file:///home/nox/dev/deno.json"
  Resolved lock file: "file:///home/nox/dev/deno.lock"
Enabling import suggestions for: https://deno.land
Hit the language server document preload limit of 1000 file system entries. You may want to use the "deno.enablePaths" configuration setting to only have Deno partially enable a workspace or increase the limit via "deno.documentPreloadLimit". In cases where Deno ends up using too much memory, you may want to lower the limit.
Server ready.
client asked to cancel request 4, but no such pending request exists, ignoring
client asked to cancel request 7, but no such pending request exists, ignoring
client asked to cancel request 419, but no such pending request exists, ignoring
successfully cancelled request with ID: 627
Unable to send result to client.
client asked to cancel request 697, but no such pending request exists, ignoring

Starting Deno language server...
  version: 1.36.3 (release, x86_64-unknown-linux-gnu)
  executable: /home/nox/.deno/bin/deno
Connected to "Visual Studio Code" 1.81.1
  Auto-resolved configuration file: "file:///home/nox/dev/deno.json"
  Resolved lock file: "file:///home/nox/dev/deno.lock"
Enabling import suggestions for: https://deno.land
Hit the language server document preload limit of 1000 file system entries. You may want to use the "deno.enablePaths" configuration setting to only have Deno partially enable a workspace or increase the limit via "deno.documentPreloadLimit". In cases where Deno ends up using too much memory, you may want to lower the limit.
Server ready.
client asked to cancel request 4, but no such pending request exists, ignoring
client asked to cancel request 7, but no such pending request exists, ignoring
client asked to cancel request 419, but no such pending request exists, ignoring
successfully cancelled request with ID: 627
Unable to send result to client.
client asked to cancel request 697, but no such pending request exists, ignoring

Restarting VS Code fixes that for a short amount of time. How do I fix this issue?

29 Replies

Mrcool 🇵🇸•15mo ago

You should remove that top deno.json Since the lsp now preloads all files it will get confused trying to preloads all JavaScript files under dev Keep deno.json only inside the projects dirs

noxifoxiOP•15mo ago

thanks, I moved the deno.json into the src folder:

Mrcool 🇵🇸•15mo ago

You have deno.json under dev dir is that the one you moved ?

noxifoxiOP•15mo ago

I didn't know this causes issues, because the whole dev folder is the project, but LSP just shouldn't do anything with static it's now under /home/nox/dev/src/deno.json

Mrcool 🇵🇸•15mo ago

If dev is actually the whole project , then using enablePath is the correct approach

noxifoxiOP•15mo ago

this is my settings.json:

{
    "deno.enablePaths": [ "src" ],
    // "deno.enable": true,
    "deno.lint": true,
    "deno.unstable": true
}

{
    "deno.enablePaths": [ "src" ],
    // "deno.enable": true,
    "deno.lint": true,
    "deno.unstable": true
}

Mrcool 🇵🇸•15mo ago

How many files do you have under src?

noxifoxiOP•15mo ago

4 + deno.json/.lock

Mrcool 🇵🇸•15mo ago

So that means enablePaths isn't really working

noxifoxiOP•15mo ago

it works, for 10 minutes and then it stops working

Mrcool 🇵🇸•15mo ago

It's preloading 1000 files which means is looking at other directories then src

noxifoxiOP•15mo ago

it isn't saying that anymore 🤷‍♀️

Starting Deno language server...
  version: 1.36.3 (release, x86_64-unknown-linux-gnu)
  executable: /home/nox/.deno/bin/deno
Connected to "Visual Studio Code" 1.81.1
  Auto-resolved configuration file: "file:///home/nox/dev/bingobrawlers.new/deno.json"
  Resolved lock file: "file:///home/nox/dev/bingobrawlers.new/deno.lock"
Enabling import suggestions for: https://deno.land
Server ready.

Starting Deno language server...
  version: 1.36.3 (release, x86_64-unknown-linux-gnu)
  executable: /home/nox/.deno/bin/deno
Connected to "Visual Studio Code" 1.81.1
  Auto-resolved configuration file: "file:///home/nox/dev/bingobrawlers.new/deno.json"
  Resolved lock file: "file:///home/nox/dev/bingobrawlers.new/deno.lock"
Enabling import suggestions for: https://deno.land
Server ready.

(don't mind the path change, it's exactly the same folder just one level deeper) but one thing I just did was deleting the deno.lock file, now it's no longer complaining 🤔 ok, here we go again:

client asked to cancel request 449, but no such pending request exists, ignoring
successfully cancelled request with ID: 468
Unable to send result to client.

client asked to cancel request 449, but no such pending request exists, ignoring
successfully cancelled request with ID: 468
Unable to send result to client.

LS broken again and throws random errors at me (which a VS code restart fixes, temporarily) hobbHands

noxifoxiOP•15mo ago

NDH•15mo ago

I've always put deno.json in the project root. Do you have any files in the project root? Can't tell by the above image.

noxifoxiOP•15mo ago

I moved the deno.json back to the project's root.

NDH•15mo ago

Did that help?

noxifoxiOP•15mo ago

so far nothing has changed, the Language Server stops working after a few minutes. gonna code more later today and test it. This might be a workaround: https://discord.com/channels/684898665143206084/684898665151594506/1147037300417638431 but should not be a permanent solution…

Mrcool 🇵🇸•15mo ago

Where are the large number of files coming from? It might be a bug with enablePaths not working as intended, I'll test it enablePaths didnt work for me as well this issue suggest to use exclude in deno.json as a workaround exclude worked for me deno.json

{
  "exclude": ["path_with_many_files_that_dont_need_lsp"]
}

{
  "exclude": ["path_with_many_files_that_dont_need_lsp"]
}

oh I didn't link to the issue https://github.com/denoland/deno/issues/19802

noxifoxiOP•15mo ago

@mrcool for the linter I guess? https://deno.land/manual@v1.36.3/getting_started/configuration_file#lint

Mrcool 🇵🇸•15mo ago

No there is a top level exclude, like the example I showed

noxifoxiOP•15mo ago

oh ok, the manual doesn't mention anything about that

Mrcool 🇵🇸•15mo ago

Its a recent feature, I opened an issue for the manual

noxifoxiOP•15mo ago

doesn't seem to work though, I don't get the normal vanilla JS auto completion in my static folder (when I use "deno.enable": true,):

noxifoxiOP•15mo ago

when I use "deno.enablePaths": [ "src" ], instead I don't get the Deno environment in the src folder:

Mrcool 🇵🇸•15mo ago

how did you use exclude ?

noxifoxiOP•15mo ago

/deno.json:

{
    "tasks": {
        "dev": "export DEV=DEV && deno run -A --watch src/main.ts",
        "start": "deno run -A --watch src/main.ts"
    },
    "exclude": [ "static/" ]
}

{
    "tasks": {
        "dev": "export DEV=DEV && deno run -A --watch src/main.ts",
        "start": "deno run -A --watch src/main.ts"
    },
    "exclude": [ "static/" ]
}

Mrcool 🇵🇸•15mo ago

Exclude means that folder won't have deno lsp enabled in it did you want to exclude static ? it should be used on the folder where you have thousand of files that don't need the lsp which folder do you have that have that many files ?, beacuse the lsp is trying to preload them all

noxifoxiOP•15mo ago

yes, the static folder contains static files, like html, javascript, css and images It seems like LSP works properly now: in .vscode/settings.json I use "deno.enablePaths": [ "src" ] in deno.json I use "exclude": [ "static/" ] (this seems to be the resolving line) I don't get shown by VS Code when I edit files in src/ that this is a deno environment (because of deno.enablePaths), but I get full code suggestions by LSP.

Mrcool 🇵🇸•15mo ago

what happens without the exclude ? the lsp crashes ?