Implementing build step with TypeScript
Implementing the build step with TypeScript is pretty simple too, as we already have TypeScript working for us.
First we need to create
tsconfig-cjs.json to use it to compile CommonJS modules. Its contents will look like this:
In our main
tsconfig.json we need to make sure we have the following settings:
While three of those are pretty self-explanatory,
importHelpers may need some explanation.
When modern and fancy syntax is compiled to an older, compatible version of JS syntax, TypeScript generates a lot of helpers code that it puts alongside each file that needs it. But if you have numerous files these helpers get duplicated multiple times, creating a lot of useless code that can be easily reused. To optimize that, there is a module named
tslib that consists of all the runtime helpers that TypeScript generates. The flag
tsconfig imports these helpers from
tslib package, instead of generating them inline.