TypeScript Language Support silently stops

[bvancea]

• VSCode Version: 1.5.2
• OS Version: Windows 10 Enterprise, Version 1607

Steps to Reproduce:

1. Opened VSCode on a project with around 1-2000 ts/tsx/css files.
2. Used VSCode for around 1 hour
3. Noticed that the Language Support for TypeScript stopped working. This included intellisense, symbols, etc.

Notes
The issue goes away after using the 'Reload Window' command.

Additional information

Code processes in the process explorer

Error for the VSCode dev tools

[bpasero]

Since I am not sure if this is us or TS, assigning both @dbaeumer and @waderyan

[waderyan]

@bvancea thank you for opening this issue and for thoroughly giving us information. We have seen issues similar to this but they are hard to reproduce. Can you help me by giving me more information?

In your settings set "typescript.tsserver.trace": "verbose" and then open the output window. You will see the output of the language service and we should see messages before it stops.

An additional step that would be helpful to us is if you can set TSS_LOG=-level verbose. there should be a log file written next to tsserver.js that would have the form of .log[0-9]+

The issue I have been tracking manifestations of this behavior is here. microsoft/TypeScript#10735

[dbaeumer]

Here is what happened: the tsserver crashed and all open requests very rejected with service died. However the service gets restarted automatically unless it crashes very frequently. In this case we show an message to the user: @bvancea have you seen such a message. When you get into that state again can you let use know the command lines of the running Code.exe processes.

[bvancea]

@waderyan Thanks for the tips, I will update the log settings and get back to you.

@dbaeumer Some additional information:

• I have not seen any visual notification regarding any tsserver crashes, save for the logging one in the dev tools.
• I am not adding any additional parameters to the Code.exe process.

[bvancea]

@waderyan Here is the output after updating the "typescript.tsserver.trace" to "verbose".

[Trace - 11:42:10 AM] TypeScript Service: canceled request with sequence number 7
[Trace - 11:42:11 AM] TypeScript Service: canceled request with sequence number 8
[Error - 11:43:28 AM] TSServer exited with code: 3
[Info  - 11:43:28 AM] Using tsserver from location: c:\Program Files (x86)\Microsoft VS Code\resources\app\extensions\typescript\server\typescript\lib\tsserver.js
[Trace - 11:44:27 AM] TypeScript Service: canceled request with sequence number 6
[Trace - 11:44:35 AM] TypeScript Service: canceled request with sequence number 15
[Trace - 1:06:23 PM] TypeScript Service: canceled request with sequence number 17
[Trace - 1:06:23 PM] TypeScript Service: canceled request with sequence number 16
[Trace - 1:06:29 PM] TypeScript Service: canceled request with sequence number 19
[Trace - 1:06:29 PM] TypeScript Service: canceled request with sequence number 20
[Trace - 1:06:30 PM] TypeScript Service: canceled request with sequence number 21
[Trace - 1:06:32 PM] TypeScript Service: canceled request with sequence number 22
[Trace - 1:07:19 PM] TypeScript Service: canceled request with sequence number 24
[Trace - 1:07:19 PM] TypeScript Service: canceled request with sequence number 23
[Trace - 1:11:53 PM] TypeScript Service: canceled request with sequence number 25
[Trace - 1:17:56 PM] TypeScript Service: canceled request with sequence number 26
[Trace - 1:17:58 PM] TypeScript Service: canceled request with sequence number 27
[Trace - 1:18:00 PM] TypeScript Service: canceled request with sequence number 29
[Trace - 1:18:00 PM] TypeScript Service: canceled request with sequence number 28
[Trace - 1:34:20 PM] TypeScript Service: canceled request with sequence number 31
[Trace - 1:34:49 PM] TypeScript Service: canceled request with sequence number 30

Where can I set TSS_LOG=-level verbose ? Is it an environment variable?

[waderyan]

Yes it is an env variable.

@mhegazy correct me if I am wrong.

[mhegazy]

yes. you can also specify a file path:

TSS_LOG=-level verbose -file c:\tmp\server.log

[bvancea]

@mhegazy @waderyan sorry for the late response.

I set the TSS_LOG as instructed, but looking through the file, I don't see anything out of the ordinary. Just Info and Perf entries.

[waderyan]

@bvancea can you share the file?