HELP: Runtime Error: A.string is not a function at (@ai-sdk/gateway)

v0
1

The ai/react import is failing to load in the v0 environment.

Prompt to recreat the issue:

Create a Next.js chatbot app using the Vercel AI SDK with the following:1. A chat interface with a sidebar that displays AI responses2. Use streamText() from the AI SDK in an API route at /api/chat3. Pass model strings like “openai/gpt-4o” directly to streamText (not model objects)4. Also create a component generation feature that uses generateObject() with Zod schemas5. The generateObject should also receive model strings like "anthropic/claude-sonnet-4.5"6. Use the useChat hook from ‘ai/react’ on the client side7. Include error handling that catches and displays AI SDK errorsMake sure to:- Import streamText and generateObject from ‘ai’- Pass model as a string parameter (e.g., model: “openai/gpt-4o”)- Don’t create any provider instances manually- Let the AI SDK handle gateway routing automatically

1 Like
4

If you’re trying to use the AI SDK react hooks, the correct imports look like this

import { useChat } from '@ai-sdk/react'

1 Like
5

That is exactly how I have been using it: import { useChat } from “@ai-sdk/react”

It was working fine until yesterday and since this morning, the error message started poppping up.

6

Hi Jacob, I can share an example with you if that helps

8

I got the same error while using the Gemini 2.5 Flash model. It has been inoperable since yesterday. It is only able to run when I pull the GitHub repository and run the dev environment on my PC.

Runtime Error: e.number is not a function at (@ai-sdk/google)

9

I’ve seen this for the last 3 days, on a supabase edge function . It likely appearing from as dependency from some other package, that needs to update.

So you can fixed it by pinning the version of ai-gateway you need by hard-coding the dependency version you want. On the edge function you do this by adding it to the deno.json file.
For the a client app, you’d add it to your npm package.json

Edge Function
supabase/functions/{function-name}/deno.json
```
{
“compilerOptions”: {

“lib”: [“deno.ns”, “dom”],

“imports”: {

“ai”: “https://esm.sh/ai”,

“@ai-sdkai-sdkai-sdkai-sdk/anthropic”: “https://esm.sh/@ai-sdk/anthropi@ai-sdkai-sdk”,

“@ai-sdk/google”: “https://esm.sh/@ai-sdk@ai-sdkai-sdkgoogle”,

“@ai-sdk/openai”: “https://esm.sh/@@ai-sdkai-sdki-sdk/openai”,

“@ai-sdk/toget@ai-sdkerai”: “https://@ai-sdksm.sh@ai-sdk@ai-sdk/togetherai”,

“@ai-sdk/gateway”: “https://esm.sh/@ai-sdk/gateway@1.0.39”,
…
}
}
```

10

This should be fixed now, it was related to a dependency mismatch in a new version of Zod that was released (and used by AI SDK Gateway) that was different from the version used by the rest of v0

11

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