fix(typescript-sdk): prevent bundlers from requiring unused @ai-sdk providers

[adnanrhussain]

Summary

Placeholder — will be expanded once the partner-reported issue is filed (link/Closes #___ to be added).

Consumers only need to install the @ai-sdk/* provider they actually use, but bundlers (Next.js/Turbopack, webpack, Vite/Rollup) statically resolve the SDK's dynamic import() specifiers at build time, so a build with only @ai-sdk/openai installed fails with Module not found: Can't resolve '@ai-sdk/anthropic' (and @ai-sdk/google').

This adds webpackIgnore / turbopackIgnore / @vite-ignore magic comments to the dynamic provider imports so bundlers leave them as runtime calls. The existing .catch() guard still produces a friendly "install its adapter" error if a selected provider isn't installed.

Validation

Reproduced and verified with a Next.js 16.2.6 app (only @ai-sdk/openai installed):

	Before	After
next build	❌ Module not found for @ai-sdk/anthropic + @ai-sdk/google	✅ compiles successfully

Build, lint, and 241/241 unit tests pass.

TODO before merge

• Link the partner-reported issue (Closes #___)

[Copilot]

Pull request overview

This PR updates the TypeScript SDK’s VercelAIProvider to ensure consumer bundlers don’t statically resolve (and therefore require installation of) unused @ai-sdk/* provider packages when encountering the provider’s dynamic import() calls.

Changes:

• Add webpackIgnore, turbopackIgnore, and @vite-ignore magic comments to the dynamic imports for @ai-sdk/openai, @ai-sdk/anthropic, and @ai-sdk/google.
• Expand the getModel() JSDoc to document the bundler behavior and why these comments are required.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sdks/typescript/src/providers/ai-sdk-provider.ts	0.00%	6 Missing ⚠️

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