TS Server fatal error: Debug Failure. False expression.

Issue Type: Bug

❗️❗️❗️ Please fill in the sections below to help us diagnose the issue ❗️❗️❗️

TypeScript Version: 4.3.0-dev.20210302

Steps to reproduce crash

1. Three (3) VSCode windows open, each using TypeScript
2. Working through 100+ errors, in one window
3. Performed npm unlink then npm install ../common just prior to this bug report showing.
4. Opened a file just after step 3.

TS Server Log
❗️Server logging disabled. To help us fix crashes like this, please enable logging by setting:

"typescript.tsserver.log": "verbose"

After enabling this setting, future crash reports will include the server log.

TS Server Error Stack
Server: syntax

Error: Debug Failure. False expression.
    at ProjectService.applyChangesInOpenFiles (/Users/scottpage/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.3.20210302/node_modules/typescript/lib/tsserver.js:159733:34)
    at Session.handlers.ts.Map.ts.getEntries._a.<computed> (/Users/scottpage/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.3.20210302/node_modules/typescript/lib/tsserver.js:160803:46)
    at /Users/scottpage/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.3.20210302/node_modules/typescript/lib/tsserver.js:162687:88
    at IOSession.Session.executeWithRequestId (/Users/scottpage/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.3.20210302/node_modules/typescript/lib/tsserver.js:162678:28)
    at IOSession.Session.executeCommand (/Users/scottpage/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.3.20210302/node_modules/typescript/lib/tsserver.js:162687:33)
    at IOSession.Session.onMessage (/Users/scottpage/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.3.20210302/node_modules/typescript/lib/tsserver.js:162713:35)
    at Interface.<anonymous> (/Users/scottpage/.vscode-insiders/extensions/ms-vscode.vscode-typescript-next-4.3.20210302/node_modules/typescript/lib/tsserver.js:165398:31)
    at Interface.emit (events.js:315:20)
    at Interface._onLine (readline.js:329:10)
    at Interface._normalWrite (readline.js:474:12)
    at Socket.ondata (readline.js:186:10)
    at Socket.emit (events.js:315:20)
    at addChunk (_stream_readable.js:295:12)
    at readableAddChunk (_stream_readable.js:271:9)
    at Socket.Readable.push (_stream_readable.js:212:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:186:23)

VS Code version: Code - Insiders 1.54.0-insider (Universal) (42e27fe5cdc58539dad9867970326a297eb8cacf, 2021-03-02T19:09:42.206Z)
OS version: Darwin x64 20.3.0

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Il punto di ingresso segnalato è ProjectService.applyChangesInOpenFiles nello stack trace di tsserver.js. Abilita il logging dettagliato di TS Server, riproduci il workflow a tre finestre con npm unlink e npm install ../common e analizza il log risultante intorno alla richiesta syntax-server. Il lavoro è completato quando il workflow non produce più il fatal Debug Failure.