TS Server fatal error: Cannot read property 'get' of undefined

[yuenc]

Issue Type: Bug

TypeScript Version: 3.8.3
Steps to reproduce crash
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TS Server Error Stack

TypeError: Cannot read property 'get' of undefined
    at resolveModuleNamesReusingOldState (tsserver.js:98026:92)
    at processImportedModules (tsserver.js:99448:35)
    at findSourceFile (tsserver.js:99191:17)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:99418:21
    at Object.forEach (tsserver.js:167:30)
    at processLibReferenceDirectives (tsserver.js:99413:16)
    at findSourceFile (tsserver.js:99188:21)
    at tsserver.js:99020:85
    at getSourceFileFromReferenceWorker (tsserver.js:98987:34)
    at processSourceFile (tsserver.js:99020:13)
    at processRootFile (tsserver.js:98843:13)
    at tsserver.js:97809:60
    at Object.forEach (tsserver.js:167:30)
    at Object.createProgram (tsserver.js:97809:16)
    at synchronizeHostData (tsserver.js:135218:26)
    at Proxy.getProgram (tsserver.js:135310:13)
    at InferredProject.Project.updateGraphWorker (tsserver.js:139786:53)
    at InferredProject.Project.updateGraph (tsserver.js:139729:42)
    at updateProjectIfDirty (tsserver.js:141076:45)
    at Array.forEach (<anonymous>)
    at ProjectService.assignProjectToOpenedScriptInfo (tsserver.js:143127:41)
    at tsserver.js:143396:107
    at Object.mapDefined (tsserver.js:562:30)
    at ProjectService.applyChangesInOpenFiles (tsserver.js:143396:48)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:144260:46)
    at tsserver.js:146003:88
    at IOSession.Session.executeWithRequestId (tsserver.js:145994:28)
    at IOSession.Session.executeCommand (tsserver.js:146003:33)
    at IOSession.Session.onMessage (tsserver.js:146027:35)
    at Interface.<anonymous> (tsserver.js:147342:27)
    at Interface.emit (events.js:203:13)
    at Interface._onLine (readline.js:316:10)
    at Interface._normalWrite (readline.js:461:12)
    at Socket.ondata (readline.js:172:10)
    at Socket.emit (events.js:203:13)
    at addChunk (_stream_readable.js:295:12)
    at readableAddChunk (_stream_readable.js:276:11)
    at Socket.Readable.push (_stream_readable.js:210:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:166:17)

VS Code version: Code 1.44.0 (2aae1f26c72891c399f860409176fe435a154b13, 2020-04-07T23:31:18.860Z)
OS version: Windows_NT x64 10.0.18363

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz (6 x 2808)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: enabled rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.87GB (9.90GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (9)

Extension	Author (truncated)	Version
vscode-deno	axe	3.5.1
vscode-wasm	dts	1.3.1
code-runner	for	0.9.17
toml-formatter	ice	0.0.3
vscode-wasm-syntax-lite	jcm	0.3.0
rust-analyzer	mat	0.2.117
remote-ssh	ms-	0.51.0
remote-ssh-edit	ms-	0.51.0
crates	ser	0.4.9

(1 theme extensions excluded)

[mjbvz]

Also hit in microsoft/vscode#96191 with TypeScript 3.9.0-dev.20200425