Add main/module fields to package.json

[jacogr]

With package root imports relies on the main/module fields, see https://github.com/jacogr/test-noble-packaging (parcel/webpack bundles correctly, browserify needs the main field otherwise it doesn't find it)

[paulmillr]

Same with noble hashes pls

[jacogr]

@noble/hashes do work since we don't import from root package, rather via lib/blake2 etc. Or at least, the above linked repo only complains on secp256k1, no issues on hashes in there. (However, it we ever do export everything from index.ts as well, the same should be applied)

[achingbrain]

Any chance of this being released please? It should fix builds that use browserify.

[paulmillr]

1.3.3