Connection to Language Server Getting Closed

[ballcoach12]

I have repeatedly seen errors over the past day or so where the Langium VSCode extension seems to lose its LSP connection to the Language Server (or at least, to me, that's what appears to be happening). I am wondering if anyone else has seen this problem. Here is the stack trace from the Output window in VSCode:

node:internal/process/promises:246
          triggerUncaughtException(err, true /* fromPromise */);
          ^

[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "Symbol(OperationCancelled)".] {
  code: 'ERR_UNHANDLED_REJECTION'
}
[Info  - 5:48:19 PM] Connection to server got closed. Server will restart.
[Error - 5:48:19 PM] Request textDocument/codeAction failed.
Error: Connection got disposed.
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:4041)
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:34:9518)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:9054)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:39:12149)
	at n (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:8736)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at nt (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:3:10845)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at gu.fireClose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:12622)
	at ChildProcess.<anonymous> (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:11839)
	at ChildProcess.emit (node:events:402:35)
	at ChildProcess.emit (node:domain:475:12)
	at maybeClose (node:internal/child_process:1064:16)
	at Process.ChildProcess._handle.onexit (node:internal/child_process:301:5)
[Error - 5:48:19 PM] Request textDocument/semanticTokens/full/delta failed.
Error: Connection got disposed.
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:4041)
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:34:9518)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:9054)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:39:12149)
	at n (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:8736)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at nt (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:3:10845)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at gu.fireClose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:12622)
	at ChildProcess.<anonymous> (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:11839)
	at ChildProcess.emit (node:events:402:35)
	at ChildProcess.emit (node:domain:475:12)
	at maybeClose (node:internal/child_process:1064:16)
	at Process.ChildProcess._handle.onexit (node:internal/child_process:301:5)
[Error - 5:48:19 PM] Request textDocument/completion failed.
Error: Connection got disposed.
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:4041)
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:34:9518)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:9054)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:39:12149)
	at n (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:8736)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at nt (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:3:10845)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at gu.fireClose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:12622)
	at ChildProcess.<anonymous> (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:11839)
	at ChildProcess.emit (node:events:402:35)
	at ChildProcess.emit (node:domain:475:12)
	at maybeClose (node:internal/child_process:1064:16)
	at Process.ChildProcess._handle.onexit (node:internal/child_process:301:5)
[Error - 5:48:19 PM] Request textDocument/codeAction failed.
Error: Connection got disposed.
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:4041)
	at Object.dispose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:34:9518)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:9054)
	at pf.handleConnectionClosed (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:39:12149)
	at n (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:36:8736)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at nt (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:3:10845)
	at Uc.invoke (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:9583)
	at dr.fire (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:10348)
	at gu.fireClose (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:2:12622)
	at ChildProcess.<anonymous> (c:\Users\myname\.vscode\extensions\langium.langium-vscode-0.3.0\out\extension.js:29:11839)
	at ChildProcess.emit (node:events:402:35)
	at ChildProcess.emit (node:domain:475:12)
	at maybeClose (node:internal/child_process:1064:16)
	at Process.ChildProcess._handle.onexit (node:internal/child_process:301:5)
An error occurred during validation: Symbol(OperationCancelled)
An error occurred during validation: Symbol(OperationCancelled)
An error occurred during validation: Symbol(OperationCancelled)
An error occurred during validation: Symbol(OperationCancelled)
An error occurred during validation: Symbol(OperationCancelled)
An error occurred during validation: Symbol(OperationCancelled)
An error occurred during validation: Symbol(OperationCancelled)
An error occurred during validation: Symbol(OperationCancelled)

[spoenemann]

I assume this has been fixed with #453, so it should be better with the upcoming version 0.4.0. Until then, try typing more slowly 😅