Since the addition of "extends" in tsconfigs, many projects now have tsconfig.base.json with their common configuration.

I personally also saw cases of tsconfig.browser.json, tsconfig.build.json, and tsconfig.publish.json.

VSCode currently detects tsconfig.json as "JSON With Comments" (jsonc). All the examples above, on the other end, are auto detected as regular json, which makes the tsconfig comments appear as errors.

I always configure my local VSCode with:

    "files.associations": {
        "tsconfig.*.json": "jsonc"
    }

And it works as expected. Would be nice, however, if this was the default configuration. :)