fix(ai-sdk): make smartQuoteTransform generic for tool type compatibility

[andybons]

Summary

• Fixed TypeScript typing issue where smartQuoteTransform returned StreamTextTransform<ToolSet>, causing type incompatibility when used with streamText() calls that have specific tool types
• Made the function generic over TOOLS extends ToolSet, matching the pattern used by smoothStream and other AI SDK transforms
• Added regression tests to verify type compatibility with custom tool types

Problem

Previously, consumers were forced to use as any casts when using the transform with typed tools:

streamText({
  model,
  tools: myTypedTools,
  experimental_transform: smartQuoteTransform() as any, // Required cast
});

Solution

The function is now generic and TypeScript properly infers tool types:

streamText({
  model,
  tools: myTypedTools,
  experimental_transform: smartQuoteTransform(), // No cast needed
});

Test plan

• Existing tests pass
• New type compatibility tests verify the fix
• Type check passes
• Build succeeds

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Project	Deployment	Review	Updated (UTC)
smartquote	Ready	Preview, Comment	Jan 10, 2026 0:00am

[Copilot]

Pull request overview

This PR fixes a TypeScript typing issue where smartQuoteTransform was incompatible with streamText() calls using specific tool types, requiring unsafe type casts.

• Made smartQuoteTransform generic over the TOOLS type parameter
• Added comprehensive TSDoc documentation explaining the generic parameter
• Added regression tests to verify type compatibility with custom tool types

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/smartquote/src/ai-sdk/index.ts	Made smartQuoteTransform generic over TOOLS extends ToolSet for type compatibility with custom tool configurations
packages/smartquote/src/ai-sdk/index.test.ts	Added type compatibility tests to verify the transform works with both custom tool types and default ToolSet

Comments suppressed due to low confidence (1)

packages/smartquote/src/ai-sdk/index.ts:91

• Superfluous argument passed to function TransformStream.

    return new TransformStream<TextStreamPart<TOOLS>, TextStreamPart<TOOLS>>({
      transform(part, controller) {
        if (part.type === 'text-delta') {
          const converted = transform(part.text);
          if (converted) {
            controller.enqueue({
              ...part,
              text: converted,
            });
          }
        } else {
          controller.enqueue(part);
        }
      },
      flush(controller) {
        const remaining = transform.flush();
        if (remaining) {
          // Generate a unique ID for the final flush chunk
          controller.enqueue({
            type: 'text-delta',
            id: `smartquotes-flush-${Date.now()}`,
            text: remaining,
          });
        }
      },
    });

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