fix: missing import extension

[hackyguru]

This package is a dependency for https://github.com/waku-org/js-waku

But, due to the import on 'src/crypto/index.browser.ts' - import { pureJsCrypto } from './.js', the CRA does not work. Fixed this by modifying the import

Steps to reproduce

1. Create a react app with npx create-react-app <project-name>
2. Install the waku sdk package from npm install @waku/sdk
3. Package installation fails and throws up the error because of the invalid import

This is a major issue because CRA will not along with package

[fryorcraken]

@hackyguru I think it would be good if you add the steps to reproduce the issue.

[mpetrunic]

@achingbrain @wemeetagain Should we add rule in ipfs eslint config to error when import is missing extension?

[achingbrain]

That's annoying. This module is imported during tests but because it's only used in browser testing it's run through esbuild first which I guess doesn't care about the missing extension?

[mpetrunic]

That's annoying. This module is imported during tests but because it's only used in browser testing it's run through esbuild first which I guess doesn't care about the missing extension?

Nope