supabase / realtime-js / 15488031381

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fix: prioritize ESM build in package exports to fix webpack warnings (#481)

Updates package.json exports to default to the ESM build instead of CommonJS,
resolving "Critical dependency: the request of a dependency is an expression"
warnings in webpack builds.

Changes:
- Set "default" to ESM build (./dist/module/) preserving native import()
- Add explicit "import" condition for ESM-aware bundlers
- Add "types" condition for better TypeScript resolution
- Keep "require" pointing to CommonJS for Node.js compatibility

Tested on Next.js v15 with webpack (non-turbopack). Previous workaround required
manual webpack config:

```js
webpack: (config) => {
  config.resolve.mainFields = ['browser', 'module', 'main'];
  config.resolve.conditionNames = ['browser', 'module', 'import', 'default'];
  return config;
}
```

This exports change eliminates the need for manual webpack configuration
by making bundlers prefer the ES2020 build that preserves dynamic imports.

Fixes: webpack "Critical dependency" warnings in issue #1437

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