microsoft/vscode-typescript-next#134

repro-vscode-typescript-nightly-extension-issue

1. install any version of ms-vscode.vscode-typescript-next equal to or later than v5.7.20240911
2. trigger Restart Extensions
3. open main.ts and trigger the Add all missing imports source action

you should see the following imports appear

import { StdinTextReader } from './src/lib/ericchase/Platform/Node/Process.js';
import type { Defer } from './src/lib/ericchase/Utility/Defer.js';

notes

• the Add all missing imports source action works just fine when ms-vscode.vscode-typescript-next is not installed
• after installing ms-vscode.vscode-typescript-next, you must at minimum trigger the Restart Extensions command
  • restarting the TS Server alone is not enough from my tests