Vend CommonJS module as well as ESM (dual vend)

[vcschapp]

Description

Per the discussion in #26, this PR configures the module to vend a CommonJS (CJS) module as well as an ESM module.

I followed the example of https://github.com/slevithan/regex, which is another one of Steven's libraries that is dual-vended already and also is a dependency of this one, as closely as possible, while making what I hope is the minimum number of edits and changes.

Testing

$ pnpm run build

[slevithan]

Thanks for the PR.

Yeah, it should continue externalizing the dependencies.

Also, it needs to have separate paths for the ESM and CJS types so the package.json file in the respective directories can have the appropriate type value (Regex+ sets this up with a postbuild script). That isn't the only possible solution to make type resolution work for both ESM and CJS, but it's a simple one, and if you're changing the solution, please verify that type resolution works for both.

[vcschapp]

Thanks for the PR.

Yeah, it should continue externalizing the dependencies.

Also, it needs to have separate paths for the ESM and CJS types so the package.json file in the respective directories can have the appropriate type value (Regex+ sets this up with a postbuild script). That isn't the only possible solution to make type resolution work for both ESM and CJS, but it's a simple one, and if you're changing the solution, please verify that type resolution works for both.

Thanks for this. I'll endeavor to put that into practice. I should be able to copy the pattern from regex library also. I'll test it.