[JS SDK] export field in package.json breaks Vite resolution #2757

When using the JS SDK with Vite, I encountered the following error:

✘ [ERROR] Failed to resolve entry for package "@opencode-ai/sdk".
The package may have incorrect main/module/exports specified in its package.json. [plugin vite:dep-scan]

After checking the package.json, I noticed it includes a custom export field named development:

"exports": {
   ".": {
      "development": "./src/index.ts",
      "import": "./dist/index.js",
      "types": "./dist/index.d.ts"
    },
}

However, according to the package.json schema, there is no standard development condition.
This seems to cause Vite’s dependency resolver to fail.

Questions
• Why is the development field present here?
• Is it an intentional extension, or a mistake?
• Should this be replaced with something like "default" or another officially supported condition?