synchronizeProjectList returns an entry with an undefined fileName if there is a missing base tsconfig.json

[minestarks]

When a folder contains a tsconfig.json with an extends property, and the base tsconfig is missing, synchronizeProjectList will return malformed data. The response contains a file entry that doesn't have a fileName property. This breaks the editor.

TS version: Can repro from 3.8 through current (4.1)

Repro steps:

1. Clone https://github.com/minestarks/repro-base-tsconfig.git
2. Open in Visual Studio using the Open Folder feature
3. Open index.ts
4. Observe that all language service features are broken

Log contains a synchronizeProjectList response like the following (the error is expected, the last file entry isn't)

   {
    "seq": 0,
    "type": "response",
    "command": "synchronizeProjectList",
    "request_seq": 230,
    "success": true,
    "body": [
        {
            "info": {
                "projectName": "E:/temp/repro_bas_tsconfig/tsconfig.json",
                "version": 1,
                "isInferred": false,
                "options": {
                    "configFilePath": "E:/temp/repro_bas_tsconfig/tsconfig.json",
                    "allowNonTsExtensions": true
                },
                "languageServiceDisabled": false
            },
            "files": [
                {
                    "fileName": "C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.d.ts",
                    "isSourceOfProjectReferenceRedirect": false
                },
                {
                    "fileName": "C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.es5.d.ts",
                    "isSourceOfProjectReferenceRedirect": false
                },
                {
                    "fileName": "C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.dom.d.ts",
                    "isSourceOfProjectReferenceRedirect": false
                },
                {
                    "fileName": "C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.webworker.importscripts.d.ts",
                    "isSourceOfProjectReferenceRedirect": false
                },
                {
                    "fileName": "C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.scripthost.d.ts",
                    "isSourceOfProjectReferenceRedirect": false
                },
                {
                    "fileName": "E:/temp/repro_bas_tsconfig/index.ts",
                    "isSourceOfProjectReferenceRedirect": false
                },
                {
                    "fileName": "E:/temp/repro_bas_tsconfig/tsconfig.json",
                    "isSourceOfProjectReferenceRedirect": false
                },
                {
                    "isSourceOfProjectReferenceRedirect": false
                }
            ],
            "projectErrors": [
                {
                    "message": "Cannot read file 'E:/temp/repro_bas_tsconfig/tsconfig_base.json'.",
                    "category": "error",
                    "code": 5083
                }
            ]
        }
    ]
}

Full log:

Info 0 [12:4:19.754] Starting TS Server Info 1 [12:4:19.756] Version: 4.0.1-rc Info 2 [12:4:19.756] Arguments: C:\vs\intpreview.16\MSBuild\Microsoft\VisualStudio\NodeJs\node.exe C:\Program Files (x86)\Microsoft SDKs\TypeScript\4.0\tsserver.js --cancellationPipeName \\.\pipe\tsserver-cancellation-ProjectHost-169420 --useSingleInferredProject --locale en-US --suppressDiagnosticEvents --enableTelemetry --allowLocalPluginLoads --npmLocation C:\vs\intpreview.16\MSBuild\Microsoft\VisualStudio\NodeJs\npm.cmd --globalPlugins @vsintellicode/typescript-intellicode-plugin --pluginProbeLocations c:\vs\intpreview.16\common7\ide\commonextensions\microsoft\typescript --typingSafeListLocation c:\vs\intpreview.16\common7\ide\commonextensions\microsoft\typescript\typingSafeList.json --eventPort 7183 Info 3 [12:4:19.756] Platform: win32 NodeVersion: 12 CaseSensitive: false Info 4 [12:4:19.756] ServerMode: undefined syntaxOnly: false hasUnknownServerMode: undefined Info 5 [12:4:19.761] Binding... Info 6 [12:4:19.796] eventPort: event "typingsInstallerPid" queued, but socket not yet initialized Info 7 [12:4:19.798] request: {"seq":218,"command":"status"} Perf 8 [12:4:19.799] 218::status: elapsed time (in milliseconds) 0.4921 Info 9 [12:4:19.799] response: {"seq":0,"type":"response","command":"status","request_seq":218,"success":true,"body":{"version":"4.0.1-rc"}} Info 10 [12:4:19.802] request: {"seq":222,"command":"configure","arguments":{"preferences":{"includeAutomaticOptionalChainCompletions":true,"includeCompletionsForModuleExports":true,"includeCompletionsWithInsertText":true,"allowTextChangesInNewFiles":true,"lazyConfiguredProjectsFromExternalProject":false,"currentTSServerVersion":"4.0","quotePreference":"auto","importModuleSpecifierPreference":"relative"},"extraFileExtensions":[{"extension":".js","scriptKind":1,"isMixedContent":false},{"extension":".ts","scriptKind":3,"isMixedContent":false},{"extension":".ascx","scriptKind":1,"isMixedContent":true},{"extension":".aspx","scriptKind":1,"isMixedContent":true},{"extension":".cshtml","scriptKind":1,"isMixedContent":true},{"extension":".htm","scriptKind":1,"isMixedContent":true},{"extension":".html","scriptKind":1,"isMixedContent":true},{"extension":".master","scriptKind":1,"isMixedContent":true},{"extension":".vbhtml","scriptKind":1,"isMixedContent":true},{"extension":".vue","scriptKind":7,"isMixedContent":true}]}} Info 11 [12:4:19.802] reload projects. Info 12 [12:4:19.803] Before ensureProjectForOpenFiles: Info 13 [12:4:19.803] Open files: Info 13 [12:4:19.803] After ensureProjectForOpenFiles: Info 14 [12:4:19.803] Open files: Info 14 [12:4:19.803] Host file extension mappings updated Info 15 [12:4:19.803] response: {"seq":0,"type":"response","command":"configure","request_seq":222,"success":true} Perf 16 [12:4:19.803] 222::configure: async elapsed time (in milliseconds) 0.9077 Info 17 [12:4:19.803] event: {"seq":0,"type":"event","event":"typingsInstallerPid","body":{"pid":36148}} Info 18 [12:4:19.804] request: {"seq":223,"command":"configurePlugin","arguments":{"pluginName":"@vsintellicode/typescript-intellicode-plugin","configuration":{"returnLookupKey":true,"timeout":500}}} Info 19 [12:4:19.805] response: {"seq":0,"type":"response","command":"configurePlugin","request_seq":223,"success":true} Perf 20 [12:4:19.805] 223::configurePlugin: async elapsed time (in milliseconds) 0.4345 Info 21 [12:4:19.805] request: {"seq":224,"command":"openExternalProjects","arguments":{"projects":[{"projectFileName":"E:/temp/repro_bas_tsconfig/repro_bas_tsconfig","rootFiles":[{"fileName":"E:\\temp\\repro_bas_tsconfig\\index.ts","scriptKind":3},{"fileName":"E:\\temp\\repro_bas_tsconfig\\tsconfig.json","scriptKind":0}],"options":{"allowJs":false,"allowNonTsExtensions":false,"allowSyntheticDefaultImports":false,"allowUnreachableCode":false,"allowUnusedLabels":false,"alwaysStrict":false,"checkJs":false,"compileOnSave":true,"declaration":false,"declarationMap":false,"downlevelIteration":false,"emitBOM":false,"emitDeclarationOnly":false,"emitDecoratorMetadata":false,"esModuleInterop":false,"experimentalAsyncFunctions":false,"experimentalDecorators":false,"forceConsistentCasingInFileNames":false,"importHelpers":false,"inlineSourceMap":false,"inlineSources":false,"isolatedModules":false,"jsx":2,"keyofStringsOnly":false,"noEmit":false,"noEmitHelpers":false,"noEmitOnError":true,"noFallthroughCasesInSwitch":false,"noImplicitAny":false,"noImplicitReturns":false,"noImplicitThis":false,"noImplicitUseStrict":false,"noLib":false,"noResolve":false,"noStrictGenericChecks":false,"noUnusedLocals":false,"noUnusedParameters":false,"preserveConstEnums":false,"preserveSymlinks":false,"removeComments":false,"resolveJsonModule":false,"skipDefaultLibCheck":false,"skipLibCheck":false,"sourceMap":true,"strict":false,"strictBindCallApply":false,"strictFunctionTypes":false,"strictNullChecks":false,"strictPropertyInitialization":false,"stripInternal":false,"suppressExcessPropertyErrors":false,"suppressImplicitAnyIndexErrors":false,"target":1}}]}} Info 22 [12:4:19.807] Opened configuration file E:/temp/repro_bas_tsconfig/tsconfig.json Info 23 [12:4:19.810] FileWatcher:: Added:: WatchInfo: E:/temp/repro_bas_tsconfig/tsconfig.json 2000 undefined Project: E:/temp/repro_bas_tsconfig/tsconfig.json WatchType: Config file Info 24 [12:4:19.811] event: {"seq":0,"type":"event","event":"projectLoadingStart","body":{"projectName":"E:/temp/repro_bas_tsconfig/tsconfig.json","reason":"Creating configured project in external project: E:/temp/repro_bas_tsconfig/repro_bas_tsconfig"}} Info 25 [12:4:19.830] Config: E:/temp/repro_bas_tsconfig/tsconfig.json : { "rootNames": [ "E:/temp/repro_bas_tsconfig/index.ts" ], "options": { "configFilePath": "E:/temp/repro_bas_tsconfig/tsconfig.json" } } Info 26 [12:4:19.831] DirectoryWatcher:: Added:: WatchInfo: e:/temp/repro_bas_tsconfig 1 undefined Project: E:/temp/repro_bas_tsconfig/tsconfig.json WatchType: Wild card directory Info 27 [12:4:19.831] e for path e:/temp/repro_bas_tsconfig not found in cache... Info 28 [12:4:19.831] Starting C:\vs\intpreview.16\MSBuild\Microsoft\VisualStudio\NodeJs\node.exe with args: ["C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/watchGuard.js","e:/temp/repro_bas_tsconfig"] Info 29 [12:4:19.924] WatchGuard for path e:/temp/repro_bas_tsconfig returned: OK Info 30 [12:4:19.926] Elapsed:: 95ms DirectoryWatcher:: Added:: WatchInfo: e:/temp/repro_bas_tsconfig 1 undefined Project: E:/temp/repro_bas_tsconfig/tsconfig.json WatchType: Wild card directory Info 31 [12:4:19.926] Local plugin loading enabled; adding e:/temp/repro_bas_tsconfig to search paths Info 32 [12:4:19.927] Loading global plugin @vsintellicode/typescript-intellicode-plugin Info 33 [12:4:19.927] Enabling plugin @vsintellicode/typescript-intellicode-plugin from candidate paths: c:\vs\intpreview.16\common7\ide\commonextensions\microsoft\typescript,C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/tsserver.js/../../.. Info 34 [12:4:19.927] Loading @vsintellicode/typescript-intellicode-plugin from c:\vs\intpreview.16\common7\ide\commonextensions\microsoft\typescript (resolved to c:/vs/intpreview.16/common7/ide/commonextensions/microsoft/typescript/node_modules) Info 35 [12:4:19.966] IntelliCode plugin: starting configuration: {"returnLookupKey":true,"timeout":500,"name":"@vsintellicode/typescript-intellicode-plugin"} Info 36 [12:4:19.966] Plugin validation succeded Info 37 [12:4:19.967] FileWatcher:: Added:: WatchInfo: E:/temp/repro_bas_tsconfig/index.ts 500 undefined Project: WatchType: Closed Script info Info 38 [12:4:19.970] Starting updateGraphWorker: Project: E:/temp/repro_bas_tsconfig/tsconfig.json Info 39 [12:4:19.982] FileWatcher:: Added:: WatchInfo: C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.d.ts 500 undefined Project: WatchType: Closed Script info Info 40 [12:4:20.1] FileWatcher:: Added:: WatchInfo: C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.es5.d.ts 500 undefined Project: WatchType: Closed Script info Info 41 [12:4:20.269] FileWatcher:: Added:: WatchInfo: C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.dom.d.ts 500 undefined Project: WatchType: Closed Script info Info 42 [12:4:20.876] FileWatcher:: Added:: WatchInfo: C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.webworker.importscripts.d.ts 500 undefined Project: WatchType: Closed Script info Info 43 [12:4:20.893] FileWatcher:: Added:: WatchInfo: C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.scripthost.d.ts 500 undefined Project: WatchType: Closed Script info Info 44 [12:4:21.334] DirectoryWatcher:: Added:: WatchInfo: E:/temp/repro_bas_tsconfig/node_modules/@types 1 undefined Project: E:/temp/repro_bas_tsconfig/tsconfig.json WatchType: Type roots Info 45 [12:4:21.334] watchDirectory for E:/temp/repro_bas_tsconfig/node_modules/@types uses cached drive information. Info 46 [12:4:21.335] Elapsed:: 1ms DirectoryWatcher:: Added:: WatchInfo: E:/temp/repro_bas_tsconfig/node_modules/@types 1 undefined Project: E:/temp/repro_bas_tsconfig/tsconfig.json WatchType: Type roots Info 47 [12:4:21.336] Finishing updateGraphWorker: Project: E:/temp/repro_bas_tsconfig/tsconfig.json Version: 1 structureChanged: true Elapsed: 1365ms Info 48 [12:4:21.336] Project 'E:/temp/repro_bas_tsconfig/tsconfig.json' (Configured) Info 49 [12:4:21.336] Files (6) C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.d.ts C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.es5.d.ts C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.dom.d.ts C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.webworker.importscripts.d.ts C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.scripthost.d.ts E:/temp/repro_bas_tsconfig/index.ts

Info 50 [12:4:21.336] -----------------------------------------------
Info 51 [12:4:21.338] event:
{"seq":0,"type":"event","event":"projectLoadingFinish","body":{"projectName":"E:/temp/repro_bas_tsconfig/tsconfig.json"}}
Info 52 [12:4:21.340] event:
{"seq":0,"type":"event","event":"telemetry","body":{"telemetryEventName":"projectInfo","payload":{"projectId":"3f502759f642092971bbd228d9008f18ff3e36b61d6fc6b82166662401f61e63","fileStats":{"js":0,"jsSize":0,"jsx":0,"jsxSize":0,"ts":1,"tsSize":24,"tsx":0,"tsxSize":0,"dts":5,"dtsSize":1053382,"deferred":0,"deferredSize":0},"compilerOptions":{},"typeAcquisition":{"enable":false,"include":false,"exclude":false},"extends":true,"files":false,"include":false,"exclude":false,"compileOnSave":false,"configFileName":"tsconfig.json","projectType":"configured","languageServiceEnabled":true,"version":"4.0.1-rc"}}}
Perf 53 [12:4:21.340] 224::openExternalProjects: elapsed time (in milliseconds) 1534.9992
Info 54 [12:4:21.341] response:
{"seq":0,"type":"response","command":"openExternalProjects","request_seq":224,"success":true,"performanceData":{"updateGraphDurationMs":1365},"body":true}
Info 55 [12:4:21.341] request:
{"seq":225,"command":"compilerOptionsForInferredProjects","arguments":{"options":{"noLib":false,"removeComments":false,"noImplicitAny":false,"declaration":false,"sourceMap":true,"noResolve":false,"target":2,"jsx":2,"module":0,"emitBOM":false,"noEmit":false,"noEmitOnError":true,"preserveConstEnums":false,"suppressImplicitAnyIndexErrors":false,"allowNonTsExtensions":true,"isolatedModules":false,"compileOnSave":false,"noEmitHelpers":false,"inlineSourceMap":false,"inlineSources":false,"emitDecoratorMetadata":false,"experimentalDecorators":false,"experimentalAsyncFunctions":false,"suppressExcessPropertyErrors":false,"skipDefaultLibCheck":false,"allowUnusedLabels":false,"noImplicitReturns":false,"noFallthroughCasesInSwitch":false,"allowUnreachableCode":false,"forceConsistentCasingInFileNames":false,"allowSyntheticDefaultImports":false,"allowJs":false,"noImplicitUseStrict":false,"noImplicitThis":false,"skipLibCheck":false,"strictNullChecks":false,"noUnusedLocals":false,"noUnusedParameters":false,"alwaysStrict":false,"importHelpers":false,"stripInternal":false,"checkJs":false,"downlevelIteration":false,"strict":false,"strictFunctionTypes":false,"noStrictGenericChecks":false,"preserveSymlinks":false,"strictPropertyInitialization":false,"esModuleInterop":false,"emitDeclarationOnly":false,"keyofStringsOnly":false,"declarationMap":false,"resolveJsonModule":false,"strictBindCallApply":false}}}
Info 56 [12:4:21.342] Scheduled: ensureProjectForOpenFiles
Perf 57 [12:4:21.342] 225::compilerOptionsForInferredProjects: elapsed time (in milliseconds) 0.7337
Info 58 [12:4:21.342] response:
{"seq":0,"type":"response","command":"compilerOptionsForInferredProjects","request_seq":225,"success":true,"body":true}
Info 59 [12:4:21.343] request:
{"seq":226,"command":"applyChangedToOpenFiles","arguments":{"openFiles":[{"fileName":"E:\temp\repro_bas_tsconfig\index.ts","scriptKind":3,"content":"\r\nconsole.log("foo"); \r\n"}]}}
Info 60 [12:4:21.344] FileWatcher:: Close:: WatchInfo: E:/temp/repro_bas_tsconfig/index.ts 500 undefined Project: WatchType: Closed Script info
Info 61 [12:4:21.344] Search path: E:/temp/repro_bas_tsconfig
Info 62 [12:4:21.345] ConfigFilePresence:: Current Watches: Config file:: File: E:/temp/repro_bas_tsconfig/tsconfig.json Currently impacted open files: RootsOfInferredProjects: OtherOpenFiles: E:/temp/repro_bas_tsconfig/index.ts Status: File added to open files impacted by this config file
Info 63 [12:4:21.345] For info: E:/temp/repro_bas_tsconfig/index.ts :: Config file name: E:/temp/repro_bas_tsconfig/tsconfig.json
Info 64 [12:4:21.346] Project 'E:/temp/repro_bas_tsconfig/tsconfig.json' (Configured)
Info 64 [12:4:21.346] Files (6)

Info 64 [12:4:21.346] -----------------------------------------------
Info 64 [12:4:21.346] Open files:
Info 64 [12:4:21.346] FileName: E:/temp/repro_bas_tsconfig/index.ts ProjectRootPath: undefined
Info 64 [12:4:21.346] Projects: E:/temp/repro_bas_tsconfig/tsconfig.json
Perf 64 [12:4:21.346] 226::applyChangedToOpenFiles: elapsed time (in milliseconds) 3.3272
Info 65 [12:4:21.346] response:
{"seq":0,"type":"response","command":"applyChangedToOpenFiles","request_seq":226,"success":true,"body":true}
Info 66 [12:4:21.347] request:
{"seq":227,"command":"synchronizeProjectList","arguments":{"knownProjects":[],"includeProjectReferenceRedirectInfo":true}}
Perf 67 [12:4:21.348] 227::synchronizeProjectList: elapsed time (in milliseconds) 1.3018
Info 68 [12:4:21.348] response:
{"seq":0,"type":"response","command":"synchronizeProjectList","request_seq":227,"success":true,"body":[{"info":{"projectName":"E:/temp/repro_bas_tsconfig/tsconfig.json","version":1,"isInferred":false,"options":{"configFilePath":"E:/temp/repro_bas_tsconfig/tsconfig.json","allowNonTsExtensions":true},"languageServiceDisabled":false},"files":[{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.es5.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.dom.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.webworker.importscripts.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.scripthost.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"E:/temp/repro_bas_tsconfig/index.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"E:/temp/repro_bas_tsconfig/tsconfig.json","isSourceOfProjectReferenceRedirect":false},{"isSourceOfProjectReferenceRedirect":false}],"projectErrors":[{"message":"Cannot read file 'E:/temp/repro_bas_tsconfig/tsconfig_base.json'.","category":"error","code":5083}]}]}
Info 69 [12:4:23.342] request:
{"seq":228,"command":"openExternalProjects","arguments":{"projects":[{"projectFileName":"E:/temp/repro_bas_tsconfig/repro_bas_tsconfig","rootFiles":[{"fileName":"E:\temp\repro_bas_tsconfig\index.ts","scriptKind":3},{"fileName":"E:\temp\repro_bas_tsconfig\tsconfig.json","scriptKind":0}],"options":{"allowJs":false,"allowNonTsExtensions":false,"allowSyntheticDefaultImports":false,"allowUnreachableCode":false,"allowUnusedLabels":false,"alwaysStrict":false,"checkJs":false,"compileOnSave":true,"declaration":false,"declarationMap":false,"downlevelIteration":false,"emitBOM":false,"emitDeclarationOnly":false,"emitDecoratorMetadata":false,"esModuleInterop":false,"experimentalAsyncFunctions":false,"experimentalDecorators":false,"forceConsistentCasingInFileNames":false,"importHelpers":false,"inlineSourceMap":false,"inlineSources":false,"isolatedModules":false,"jsx":2,"keyofStringsOnly":false,"noEmit":false,"noEmitHelpers":false,"noEmitOnError":true,"noFallthroughCasesInSwitch":false,"noImplicitAny":false,"noImplicitReturns":false,"noImplicitThis":false,"noImplicitUseStrict":false,"noLib":false,"noResolve":false,"noStrictGenericChecks":false,"noUnusedLocals":false,"noUnusedParameters":false,"preserveConstEnums":false,"preserveSymlinks":false,"removeComments":false,"resolveJsonModule":false,"skipDefaultLibCheck":false,"skipLibCheck":false,"sourceMap":true,"strict":false,"strictBindCallApply":false,"strictFunctionTypes":false,"strictNullChecks":false,"strictPropertyInitialization":false,"stripInternal":false,"suppressExcessPropertyErrors":false,"suppressImplicitAnyIndexErrors":false,"target":1}}]}}
Perf 70 [12:4:23.343] 228::openExternalProjects: elapsed time (in milliseconds) 0.5764
Info 71 [12:4:23.343] response:
{"seq":0,"type":"response","command":"openExternalProjects","request_seq":228,"success":true,"body":true}
Info 72 [12:4:23.343] request:
{"seq":229,"command":"synchronizeProjectList","arguments":{"knownProjects":[],"includeProjectReferenceRedirectInfo":true}}
Perf 73 [12:4:23.344] 229::synchronizeProjectList: elapsed time (in milliseconds) 0.2643
Info 74 [12:4:23.344] response:
{"seq":0,"type":"response","command":"synchronizeProjectList","request_seq":229,"success":true,"body":[{"info":{"projectName":"E:/temp/repro_bas_tsconfig/tsconfig.json","version":1,"isInferred":false,"options":{"configFilePath":"E:/temp/repro_bas_tsconfig/tsconfig.json","allowNonTsExtensions":true},"languageServiceDisabled":false},"files":[{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.es5.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.dom.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.webworker.importscripts.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.scripthost.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"E:/temp/repro_bas_tsconfig/index.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"E:/temp/repro_bas_tsconfig/tsconfig.json","isSourceOfProjectReferenceRedirect":false},{"isSourceOfProjectReferenceRedirect":false}],"projectErrors":[{"message":"Cannot read file 'E:/temp/repro_bas_tsconfig/tsconfig_base.json'.","category":"error","code":5083}]}]}
Info 75 [12:4:23.853] Running: ensureProjectForOpenFiles
Info 76 [12:4:23.853] Before ensureProjectForOpenFiles:
Info 77 [12:4:23.853] Project 'E:/temp/repro_bas_tsconfig/tsconfig.json' (Configured)
Info 77 [12:4:23.853] Files (6)

Info 77 [12:4:23.853] -----------------------------------------------
Info 77 [12:4:23.853] Open files:
Info 77 [12:4:23.853] FileName: E:/temp/repro_bas_tsconfig/index.ts ProjectRootPath: undefined
Info 77 [12:4:23.853] Projects: E:/temp/repro_bas_tsconfig/tsconfig.json
Info 77 [12:4:23.853] After ensureProjectForOpenFiles:
Info 78 [12:4:23.853] Project 'E:/temp/repro_bas_tsconfig/tsconfig.json' (Configured)
Info 78 [12:4:23.853] Files (6)

Info 78 [12:4:23.853] -----------------------------------------------
Info 78 [12:4:23.853] Open files:
Info 78 [12:4:23.853] FileName: E:/temp/repro_bas_tsconfig/index.ts ProjectRootPath: undefined
Info 78 [12:4:23.853] Projects: E:/temp/repro_bas_tsconfig/tsconfig.json
Info 78 [12:4:23.854] got projects updated in background, updating diagnostics for E:/temp/repro_bas_tsconfig/index.ts
Info 79 [12:4:23.854] event:
{"seq":0,"type":"event","event":"projectsUpdatedInBackground","body":{"openFiles":["E:/temp/repro_bas_tsconfig/index.ts"]}}
Info 80 [12:4:25.867] request:
{"seq":230,"command":"synchronizeProjectList","arguments":{"knownProjects":[],"includeProjectReferenceRedirectInfo":true}}
Perf 81 [12:4:25.867] 230::synchronizeProjectList: elapsed time (in milliseconds) 0.3291
Info 82 [12:4:25.867] response:
{"seq":0,"type":"response","command":"synchronizeProjectList","request_seq":230,"success":true,"body":[{"info":{"projectName":"E:/temp/repro_bas_tsconfig/tsconfig.json","version":1,"isInferred":false,"options":{"configFilePath":"E:/temp/repro_bas_tsconfig/tsconfig.json","allowNonTsExtensions":true},"languageServiceDisabled":false},"files":[{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.es5.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.dom.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.webworker.importscripts.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"C:/Program Files (x86)/Microsoft SDKs/TypeScript/4.0/lib.scripthost.d.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"E:/temp/repro_bas_tsconfig/index.ts","isSourceOfProjectReferenceRedirect":false},{"fileName":"E:/temp/repro_bas_tsconfig/tsconfig.json","isSourceOfProjectReferenceRedirect":false},{"isSourceOfProjectReferenceRedirect":false}],"projectErrors":[{"message":"Cannot read file 'E:/temp/repro_bas_tsconfig/tsconfig_base.json'.","category":"error","code":5083}]}]}
Perf 83 [12:4:26.890] GC::before 40667416, after 40391640

[minestarks]

FYI @sheetalkamat @uniqueiniquity - I think this may have come in with the isSourceOfProjectReferenceRedirect change