feat: Adding Vercel AI SDK mapper

[abarker-launchdarkly]

No description provided.

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[tracisiebel]

v minor comments on function

[tracisiebel]

Do you have an example of how someone using the Vercel AI SDK would use this wrapper? If not - no worries - we can come up with something.

[abarker-launchdarkly]

Do you have an example of how someone using the Vercel AI SDK would use this wrapper? If not - no worries - we can come up with something.

const aiConfig = await aiClient.config('vercel-ai-config', context, {});
const result = await aiConfig.tracker.trackVercelAISDKGenerateTextMetrics(() =>
  generateText(aiConfig.toVercelAISDK(openai)),
);
console.log(result.text);

[cursor]

Bug: Metrics Tracking Fails When Finish Reason Undefined

In the trackVercelAISDKStreamTextMetrics method, if result.finishReason is undefined (which is allowed by its optional type), the optional chaining ?.then() prevents any metrics from being tracked. This includes duration, success/error status, and token usage, leading to incomplete analytics and inconsistent behavior compared to other tracking methods.

packages/sdk/server-ai/src/LDAIConfigTrackerImpl.ts#L150-L193

js-core/packages/sdk/server-ai/src/LDAIConfigTrackerImpl.ts

Lines 150 to 193 in 8ce7288

	trackVercelAISDKStreamTextMetrics<
	TRes extends {
	finishReason?: Promise<string>;
	usage?: Promise<{
	totalTokens?: number;
	promptTokens?: number;
	completionTokens?: number;
	}>;
	},
	>(func: () => TRes): TRes {
	const startTime = Date.now();
	try {
	const result = func();
	result.finishReason
	?.then(async (finishReason) => {
	const endTime = Date.now();
	this.trackDuration(endTime - startTime);
	if (finishReason === 'error') {
	this.trackError();
	} else {
	this.trackSuccess();
	if (result.usage) {
	try {
	this.trackTokens(createVercelAISDKTokenUsage(await result.usage));
	} catch {
	// Intentionally squashing this error
	}
	}
	}
	})
	.catch(() => {
	const endTime = Date.now();
	this.trackDuration(endTime - startTime);
	this.trackError();
	});
	return result;
	} catch (err) {
	const endTime = Date.now();
	this.trackDuration(endTime - startTime);
	this.trackError();
	throw err;
	}
	}

Fix in Cursor • Fix in Web

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