fix(openai-compatible): return actual usage when steaming instead of NaN

[ki7ick]

return actual usage when steaming instead of NaN with openai-compatiable-provider

Background

In my project, used createOpenAICompatible and streamText.

For use actual usage, we used providerOptions in streamText like this:

streamText({
  ...,
  providerOptions: {
    'xxxprovider': {
      stream_options: { include_usage: true }
    },
  },
  ...
})

But when I upgrade @ai-sdk/openai-compatible package to latest version 0.2.14, I found useage return NaN.

Finally, I found some code chang in 0.2.12, like this:

stream_options been overridden, my providerOptions about this param never work.

I think it's purpose is convenient for get actual usage in this code change, but it's only work in xai-providers, because includeUsage param only exist in xai-provider.ts in version 0.2.12.

Summary

use

...this.config.includeUsage && {
  include_usage: true 
}

to stop overridden