Add Groq provider support

[dhvll]

Resolves: #523

[vercel]

@dhvll is attempting to deploy a commit to the Merit Systems Team on Vercel.

A member of the Team first needs to authorize it.

[vercel]

Suggested change

	if (chunk.usage !== null) {
	if (chunk.usage && chunk.usage !== null) {

The code checks if (chunk.usage !== null) but chunk.usage could be undefined, which would cause a TypeError at runtime.

View Details

Analysis

TypeError in GroqProvider.handleBody() when accessing undefined usage properties

What fails: GroqProvider.handleBody() checks if (chunk.usage !== null) but crashes when chunk.usage is undefined, attempting to access chunk.usage.prompt_tokens

How to reproduce:

// When streaming chunk has missing usage property (undefined)
const chunk = { id: "test", choices: [] }; // usage property omitted
if (chunk.usage !== null) { // undefined !== null is true 
  chunk.usage.prompt_tokens; // TypeError: Cannot read properties of undefined
}

Result: TypeError: Cannot read properties of undefined (reading 'prompt_tokens')

Expected: Should safely skip undefined usage like OpenRouterProvider.ts does with if (chunk.usage && chunk.usage !== null)

[rsproule]

Thanks for making this PR!

This server side support looks good, so you are pretty much done.

We also need support for this in the typescript SDK so that people can actually use it.

You will just need to add the groq provider. You can look how this is done for openai here

then quickly add to next sdk:

echo/packages/sdk/next/src/index.ts

Lines 112 to 114 in dd2e7c1

	openai: createEchoOpenAI(config),
	anthropic: createEchoAnthropic(config),
	google: createEchoGoogle(config),

Dont worry about bumping the sdk versions, our CI will do that