**Before**: ``` .pipe( catchError(error => {}), ) ``` **After fix**: ``` .pipe( catchError(error: unknown => {}), // compilation errors ) ``` It looks like this line should perform some checks before adding `: unknown`: https://github.com/cartant/eslint-plugin-rxjs/blob/ebfb553815d38362341d9b7d382b378c858e7321/source/rules/no-implicit-any-catch.ts#L116