If you get the Unknown file extension ".ts" error while setting up Playwright configuration using Node.js, that's because Node.js does not natively support TS files (yet).

In order to fix this, you have a few choices:

Use a JS Config File

ViewLint supports both JS and TS configuration files. If you wish to keep using Node.js, you can always switch to using a viewlint.config.js or viewlint.config.mjs.

JS configuration files are also supported when initializing with @viewlint/create-config.

Switch to a Different Package Manager

If you want to take full advantage of the power of ViewLint, which is written in TypeScript, you can choose to switch to a different package manager such as Bun.