Notes about Typescript support

[cinnamon-bun]

12:13 PM gwil:

These files could be typescript and esbuild would be able to build them to JS modules just fine. The only thing we’d need is a poly.d.ts declarations file and types property in package.json which TS consumers could use for types.

[sgwilym]

The only sad thing about this is esbuild can't build declaration files, only tsc can - so we'll have this rippingly fast bundling process and then have to wait around a while longer for tsc to compile the declaration files. See evanw/esbuild#95