from review of pr #28 I discovered that code is sometimes indented with only tabs and sometimes with a combination of tabs and spaces. Also at least one occasion of code with no semicolon.

Most drastic would be to use standard, semistandard, or prettier-standard to reformat the code in what I think is a nicer style. (prettier-standard actually uses the prettierx fork of Prettier that is maintained by myself, which could be seen as an advantage or perhaps even a disadvantage)

Less drastic would be to apply some simplistic rules such as only indent with tabs and always use semicolons to achieve better consistency with minimal code churn. I think it should be possible to do this with custom eslint rule configuration.