ES/TSLint integration - error after restarting server in vscode

[ben-polinsky]

Reproduction:

• Open the itwinjs-core library in vscode.
• Open a typescript file under core/common.
• Restart the eslint server (Open command palette and type/select "restart eslint server")
• Wait for server to restart. Note error on first character of file:
  

The issue is not restricted to core/common files, but was easily reproduced easily for files in that package.

Fiddling with the inherited eslint.config.base.js seems to help, but no concrete fix yet.

[ben-polinsky]

An open and close of the file in question seems to fix the issue... I'll keep this open while I investigate more. I've seen the error at other times, but paid it no mind. As @anmolshres98 has observed, eslint cli works fine.