From microsoft/vscode#80074

TypeScript Version: 3.6.2

Search Terms:

• tsc
• build
• watch
• incremental

Repo
Clone and start building VS Code with --incremental --watch

git clone https://github.com/microsoft/vscode.git
cd vscode
yarn
node --max-old-space-size=4096 ./node_modules/.bin/tsc --incremental -w -p src/tsconfig.json

1. Let first full build complete
2. Open src/vs/base/common/linkedList.ts
3. Rename the public method unshift to deshift and save

Expected behavior:
Recompile is fairly quick. Our custom gulp-tsb builder takes a second or two for this case

Actual behavior:
Rebuild with tsc takes considerable time. This blocks VS Code from migrating to use standard tsc --watch instead of gulp-tsb