Vscode-eslint: (Insiders/1.2.10) "Cannot read property 'then' of undefined"

[ankon]

~~~~
[Info - 1:47:07 PM] ESLint server is running.
/home/andreas/.vscode-insiders/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613
return document2Library[document.uri].then((library) => {
^

TypeError: Cannot read property 'then' of undefined
at validateSingle (/home/andreas/.vscode-insiders/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613:42)
at Object.messageQueue.onNotification [as handler] (/home/andreas/.vscode-insiders/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:308:5)
at BufferedMessageQueue.processQueue (/home/andreas/.vscode-insiders/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:297:18)
at Immediate.timer.setImmediate (/home/andreas/.vscode-insiders/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:260:18)
at runCallback (timers.js:651:20)
at tryOnImmediate (timers.js:624:5)
at processImmediate [as _immediateCallback] (timers.js:596:5)
[Error - 1:47:07 PM] Connection to server got closed. Server will not be restarted.
[Info - 1:47:07 PM] ESLint server stopped.
~~~~

Only thing I can remember is that I did update VSCode and the extension, and then did my usual "work on projects".

[ankon]

Some more thinking/playing: This happened in a project where npm install hadn't been executed; I did that now and the extension seems to be slightly happier...
~~
[Warn - 1:50:16 PM]
No ESLint configuration (e.g .eslintrc) found for file: index.js
File will not be validated. Consider running the 'Create .eslintrc.json file' command.
Alternatively you can disable ESLint for this workspace by executing the 'Disable ESLint for this workspace' command.
~~

[oliversalzburg]

Sadly, installing all dependencies only temporarily resolved the issue for me. Now the server keeps crashing again.

[dbaeumer]

This is a bug I introduced in 1.2.10. Will work on a fix.

[svipas]

Same here, this is the output:

[Info  - 5:39:05 PM] ESLint server is running.
/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613
    return document2Library[document.uri].then((library) => {
                                         ^

TypeError: Cannot read property 'then' of undefined
    at validateSingle (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613:42)
    at Object.messageQueue.onNotification [as handler] (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:308:5)
    at BufferedMessageQueue.processQueue (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:297:18)
    at Immediate.timer.setImmediate (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:260:18)
    at runCallback (timers.js:651:20)
    at tryOnImmediate (timers.js:624:5)
    at processImmediate [as _immediateCallback] (timers.js:596:5)
[Info  - 5:39:05 PM] Connection to server got closed. Server will restart.
[Info  - 5:39:05 PM] ESLint server stopped.
[Info  - 5:39:06 PM] ESLint server is running.
/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613
    return document2Library[document.uri].then((library) => {
                                         ^

TypeError: Cannot read property 'then' of undefined
    at validateSingle (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613:42)
    at Object.messageQueue.onNotification [as handler] (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:308:5)
    at BufferedMessageQueue.processQueue (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:297:18)
    at Immediate.timer.setImmediate (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:260:18)
    at runCallback (timers.js:651:20)
    at tryOnImmediate (timers.js:624:5)
    at processImmediate [as _immediateCallback] (timers.js:596:5)
[Info  - 5:39:06 PM] Connection to server got closed. Server will restart.
[Info  - 5:39:06 PM] ESLint server stopped.
[Info  - 5:39:07 PM] ESLint server is running.
/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613
    return document2Library[document.uri].then((library) => {
                                         ^

TypeError: Cannot read property 'then' of undefined
    at validateSingle (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613:42)
    at Object.messageQueue.onNotification [as handler] (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:308:5)
    at BufferedMessageQueue.processQueue (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:297:18)
    at Immediate.timer.setImmediate (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:260:18)
    at runCallback (timers.js:651:20)
    at tryOnImmediate (timers.js:624:5)
    at processImmediate [as _immediateCallback] (timers.js:596:5)
[Info  - 5:39:07 PM] Connection to server got closed. Server will restart.
[Info  - 5:39:07 PM] ESLint server stopped.
[Info  - 5:39:08 PM] ESLint server is running.
/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613
    return document2Library[document.uri].then((library) => {
                                         ^

TypeError: Cannot read property 'then' of undefined
    at validateSingle (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613:42)
    at Object.messageQueue.onNotification [as handler] (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:308:5)
    at BufferedMessageQueue.processQueue (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:297:18)
    at Immediate.timer.setImmediate (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:260:18)
    at runCallback (timers.js:651:20)
    at tryOnImmediate (timers.js:624:5)
    at processImmediate [as _immediateCallback] (timers.js:596:5)
[Info  - 5:39:08 PM] Connection to server got closed. Server will restart.
[Info  - 5:39:08 PM] ESLint server stopped.
[Info  - 5:39:09 PM] ESLint server is running.
/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613
    return document2Library[document.uri].then((library) => {
                                         ^

TypeError: Cannot read property 'then' of undefined
    at validateSingle (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:613:42)
    at Object.messageQueue.onNotification [as handler] (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:308:5)
    at BufferedMessageQueue.processQueue (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:297:18)
    at Immediate.timer.setImmediate (/home/svipben/.vscode/extensions/dbaeumer.vscode-eslint-1.2.10/server/server.js:260:18)
    at runCallback (timers.js:651:20)
    at tryOnImmediate (timers.js:624:5)
    at processImmediate [as _immediateCallback] (timers.js:596:5)
[Error - 5:39:09 PM] Connection to server got closed. Server will not be restarted.
[Info  - 5:39:09 PM] ESLint server stopped.

[dbaeumer]

Sorry for this. I optimized performance be reordering some notifications and request and not tried to validate closed documents. Published 1.2.11 which should fix the problem.

[oliversalzburg]

Seems to work like a charm. Thanks for the quick fix :)

[scottsauber]

@dbaeumer - thanks for the quick fix!

[guppie70]

Indeed - update works perfectly! Many thanks for your support!

[kurtnovack]

I ran into this issue today and had the latest version. If anyone else sees this, uninstalling/reinstalling fixed it.