Fix or explain use of modules with TypeScript

[mattt]

In #161 (comment), a user reported the following error:

TypeError: replicate_1.default is not a constructor

A solution was to add "esModuleInterop": true to the project's tsconfig.json file.

We should either make this step unnecessary, or barring that, document this workaround.

[depyronick]

Note that if you are going to use esModuleInterop, you probably won't be able to use * as Module imports anymore.

[zeke]

Is this still relevant? cc @aron