Unable to get variable suggestions in VS Code, error in TS Server logs

[IllusionMH]

Problem appeared last week when I've updated typescript version to @next and added path to updated version in typescript.tsdk.

As result - completion for object properties/methods works as intended, but VS Code unable to produce suggestions for variables etc. Which makes development in big files problematic.
Problem appeared in big JS only project (TS Server reports 3566 files), allowJS/checkJS enabled. I will try to make smaller repro case later.
VS Code 1.27.2 works fine with built-in TS 3.0.3, but fails with TS 3.1.0-dev.20180829 and later, therefore issue was created directly in this repo. VS Code Insiders, that has 3.1.0 build-in - has described problem.

TypeScript Version: 3.1.0-dev.20180925
First bad TypeScript Version: 3.1.0-dev.20180829

Search Terms: suggestions, completionInfo, intellisense, completion, 'some' of undefined

Code

import React from 'react';
import { Row, Col } from 'react-bootstrap';

const REQUIRED_EXAMPLE_COLUMN = 6;

export const EditComponent = () => (<Row>
    <Col xs={|cursor here|} />
</Row>);

const noSuggestion = 2 * |cursor here|;

Expected behavior:
Proper list of suggestions.

Actual behavior:
Only text suggestions are available in VS Code.

Screenshot

`tsserver.log` has next trace in it:

Info 3536 [14:44:41.382] request:
    {"seq":35,"type":"request","command":"quickinfo","arguments":{"file":"c:/projects/<path redacted>/index.js","line":7,"offset":13}}
Perf 3537 [14:44:41.382] 35::quickinfo: elapsed time (in milliseconds) 0.2604
Info 3538 [14:44:41.382] response:
    {"seq":0,"type":"response","command":"quickinfo","request_seq":35,"success":false,"message":"No content available."}
Info 3539 [14:44:41.715] request:
    {"seq":36,"type":"request","command":"getCodeFixes","arguments":{"file":"c:/projects/<path redacted>/index.js","startLine":7,"startOffset":13,"endLine":7,"endOffset":15,"errorCodes":[17000]}}
Perf 3540 [14:44:41.716] 36::getCodeFixes: elapsed time (in milliseconds) 0.6273
Info 3541 [14:44:41.716] response:
    {"seq":0,"type":"response","command":"getCodeFixes","request_seq":36,"success":true,"body":[{"fixName":"disableJsDiagnostics","description":"Ignore this error message","changes":[{"fileName":"c:/projects/<path redacted>/index.js","textChanges":[{"start":{"line":7,"offset":5},"end":{"line":7,"offset":5},"newText":"// @ts-ignore\n    "}]}],"fixId":"disableJsDiagnostics","fixAllDescription":"Add '@ts-ignore' to all error messages"},{"fixName":"disableJsDiagnostics","description":"Disable checking for this file","changes":[{"fileName":"c:/projects/<path redacted>/index.js","textChanges":[{"start":{"line":1,"offset":1},"end":{"line":1,"offset":1},"newText":"// @ts-nocheck\n"}]}]}]}
Info 3542 [14:44:42.452] request:
    {"seq":37,"type":"request","command":"completionInfo","arguments":{"file":"c:/projects/<path redacted>/index.js","line":7,"offset":14,"includeExternalModuleExports":true,"includeInsertTextCompletions":true}}
Info 3543 [14:44:42.453] getCompletionData: Get current token: 0
Info 3544 [14:44:42.453] getCompletionData: Is inside comment: 0
Info 3545 [14:44:42.453] getCompletionData: Get previous token 1: 0
Info 3546 [14:44:42.453] getCompletionsAtPosition: isCompletionListBlocker: 0
Err 3547  [14:44:42.460] Exception on executing command {"seq":37,"type":"request","command":"completionInfo","arguments":{"file":"c:/projects/<path redacted>/index.js","line":7,"offset":14,"includeExternalModuleExports":true,"includeInsertTextCompletions":true}}:

    Cannot read property 'some' of undefined

    TypeError: Cannot read property 'some' of undefined
    at C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:94735:59
    at C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:108369:21
    at forEachExternalModule (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:108382:21)
    at Object.forEachExternalModuleToImportFrom (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:108367:13)
    at getSymbolsFromOtherSourceFileExports (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:94722:28)
    at getGlobalCompletions (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:94619:21)
    at tryGetGlobalSymbols (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:94542:25)
    at getCompletionData (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:94421:22)
    at Object.getCompletionsAtPosition (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:93613:34)
    at Object.getCompletionsAtPosition (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:114869:35)
    at IOSession.Session.getCompletions (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:122655:64)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:121716:61)
    at C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:123133:88
    at IOSession.Session.executeWithRequestId (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:123124:28)
    at IOSession.Session.executeCommand (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:123133:33)
    at IOSession.Session.onMessage (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:123153:35)
    at Interface.<anonymous> (C:\web\ts-setup\typscript-next\node_modules\typescript\lib\tsserver.js:124417:27)
    at emitOne (events.js:116:13)
    at Interface.emit (events.js:211:7)
    at Interface._onLine (readline.js:282:10)
    at Interface._normalWrite (readline.js:424:12)
    at Socket.ondata (readline.js:141:10)
    at emitOne (events.js:116:13)
    at Socket.emit (events.js:211:7)
    at addChunk (_stream_readable.js:263:12)
    at readableAddChunk (_stream_readable.js:250:11)
    at Socket.Readable.push (_stream_readable.js:208:10)
    at Pipe.onread (net.js:594:20)
Info 3548 [14:44:42.461] response:
    {"seq":0,"type":"response","command":"completionInfo","request_seq":37,"success":false,"message":"Error processing request. Cannot read property 'some' of undefined\nTypeError: Cannot read property 'some' of undefined\n    at C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:94735:59\n    at C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:108369:21\n    at forEachExternalModule (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:108382:21)\n    at Object.forEachExternalModuleToImportFrom (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:108367:13)\n    at getSymbolsFromOtherSourceFileExports (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:94722:28)\n    at getGlobalCompletions (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:94619:21)\n    at tryGetGlobalSymbols (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:94542:25)\n    at getCompletionData (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:94421:22)\n    at Object.getCompletionsAtPosition (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:93613:34)\n    at Object.getCompletionsAtPosition (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:114869:35)\n    at IOSession.Session.getCompletions (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:122655:64)\n    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:121716:61)\n    at C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:123133:88\n    at IOSession.Session.executeWithRequestId (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:123124:28)\n    at IOSession.Session.executeCommand (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:123133:33)\n    at IOSession.Session.onMessage (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:123153:35)\n    at Interface.<anonymous> (C:\\web\\ts-setup\\typscript-next\\node_modules\\typescript\\lib\\tsserver.js:124417:27)\n    at emitOne (events.js:116:13)\n    at Interface.emit (events.js:211:7)\n    at Interface._onLine (readline.js:282:10)\n    at Interface._normalWrite (readline.js:424:12)\n    at Socket.ondata (readline.js:141:10)\n    at emitOne (events.js:116:13)\n    at Socket.emit (events.js:211:7)\n    at addChunk (_stream_readable.js:263:12)\n    at readableAddChunk (_stream_readable.js:250:11)\n    at Socket.Readable.push (_stream_readable.js:208:10)\n    at Pipe.onread (net.js:594:20)"}

Related Issues:
Pull request that introduced issue #25708 line

[IllusionMH]

Looks like there is an easy fix for this issue. Would you mind to accept PR on this?

[IllusionMH]

I've tried several file/code structures, but no luck to get repro case and I would try to debug it later.

In the meantime, do you accept PR that fixes exception?

[RyanCavanaugh]

@IllusionMH sure, a PR would be great

[IllusionMH]

Checked with recent typescript@next package and suggestions works as expected.

@RyanCavanaugh Thank you!