Add a module exports condition

[Andarist]

This would allow bundlers to "deduplicate" those:

// in pkg-a
import tinyInvariant from 'tiny-invariant'
// in pkg-b
const tinyInvariant = require('tiny-invariant')

Without this condition, 2 copies of tiny-invariant have to be loaded/bundled.

Isn't the JS ecosystem just great? 🤣

[alexreardon]

I'll aim to ship this tomorrow

[Andarist]

I actually forgot here that you are exports: 'auto' here with Rollup, so... this change would not be quite OK as bundlers would assume that there your library is supposed to be accessed through.default in CJS. So this can't be merged - if one manages to load tiny-invariant from two different module systems then they will just load 2 different modules.