chore: fix unused vars not being flagged by our lint tooling (#14329)

## Summary

we have a ton of unused variables in our codebase. For some reason, the
lint rules to flag these were disabled.

This PR fixes only the violations flagged by `oxlint` - it's already a
bunch. We can open another PR for the TypeScript flagged problems.

`oxlint` finds many false positives in tests, and since this is less
important for tests anyway, we can just disable the rule for test files.

To reduce the scope, we still ignore those errors in `examples/` for now
- also because some of the unused variables in `examples` are
intentionally there.

## Checklist

- [ ] Tests have been added / updated (for bug fixes / features)
- [ ] Documentation has been added / updated (for bug fixes / features)
- [x] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run `pnpm changeset` in the project root)
- [x] I have reviewed this pull request (self-review)

Author: felixarntz

.changeset/twelve-moons-hang.md

@@ -0,0 +1,32 @@
+---
+"@ai-sdk/openai-compatible": patch
+"@ai-sdk/amazon-bedrock": patch
+"@ai-sdk/open-responses": patch
+"@ai-sdk/provider-utils": patch
+"@ai-sdk/google-vertex": patch
+"@ai-sdk/moonshotai": patch
+"@ai-sdk/togetherai": patch
+"@ai-sdk/anthropic": patch
+"@ai-sdk/deepinfra": patch
+"@ai-sdk/fireworks": patch
+"@ai-sdk/cerebras": patch
+"@ai-sdk/devtools": patch
+"@ai-sdk/alibaba": patch
+"@ai-sdk/baseten": patch
+"@ai-sdk/codemod": patch
+"@ai-sdk/gateway": patch
+"@ai-sdk/cohere": patch
+"@ai-sdk/google": patch
+"@ai-sdk/openai": patch
+"@ai-sdk/vercel": patch
+"@ai-sdk/react": patch
+"@ai-sdk/groq": patch
+"@ai-sdk/luma": patch
+"@ai-sdk/otel": patch
+"@ai-sdk/fal": patch
+"@ai-sdk/mcp": patch
+"@ai-sdk/xai": patch
+"ai": patch
+---
+
+chore: fix unused vars not being flagged by our lint tooling

.oxlintrc.json

@@ -11,6 +11,12 @@
       "rules": {
         "no-redeclare": "off"
       }
+    },
+    {
+      "files": ["examples/**", "**/*.test.ts"],
+      "rules": {
+        "no-unused-vars": "off"
+      }
     }
   ],
   "rules": {
@@ -64,7 +70,7 @@
     "no-unneeded-ternary": "off",
     "no-unsafe-finally": "off",
     "no-unused-expressions": "off",
-    "no-unused-vars": "off",
+    "no-unused-vars": "error",
     "no-use-before-define": "off",
     "no-useless-catch": "off",
     "no-useless-concat": "off",

packages/ai/src/generate-object/generate-object.ts

@@ -19,15 +19,11 @@ import { standardizePrompt } from '../prompt/standardize-prompt';
 import { wrapGatewayError } from '../prompt/wrap-gateway-error';
 import { getGlobalTelemetryIntegration } from '../telemetry/get-global-telemetry-integration';
 import { TelemetrySettings } from '../telemetry/telemetry-settings';
-import {
-  CallWarning,
-  FinishReason,
-  LanguageModel,
-} from '../types/language-model';
+import { LanguageModel } from '../types/language-model';
 import { LanguageModelRequestMetadata } from '../types/language-model-request-metadata';
 import { LanguageModelResponseMetadata } from '../types/language-model-response-metadata';
-import { ProviderMetadata } from '../types/provider-metadata';
-import { asLanguageModelUsage, LanguageModelUsage } from '../types/usage';
+
+import { asLanguageModelUsage } from '../types/usage';
 import { DownloadFunction } from '../util/download/download-function';
 import { notify } from '../util/notify';
 import type { Listener } from '../util/notify';

packages/ai/src/generate-object/output-strategy.ts

@@ -141,7 +141,7 @@ const arrayOutputStrategy = <ELEMENT>(
     // possible future optimization: use arrays directly when model supports grammar-guided generation
     jsonSchema: async () => {
       // remove $schema from schema.jsonSchema:
-      const { $schema, ...itemSchema } = await schema.jsonSchema;
+      const { $schema: _$schema, ...itemSchema } = await schema.jsonSchema;
 
       return {
         $schema: 'http://json-schema.org/draft-07/schema#',

packages/ai/src/generate-text/output.ts

@@ -218,7 +218,7 @@ export const array = <ELEMENT>({
     // JSON schema that describes an array of elements:
     responseFormat: resolve(elementSchema.jsonSchema).then(jsonSchema => {
       // remove $schema from schema.jsonSchema:
-      const { $schema, ...itemSchema } = jsonSchema;
+      const { $schema: _$schema, ...itemSchema } = jsonSchema;
 
       return {
         type: 'json' as const,

packages/ai/src/prompt/convert-to-language-model-prompt.ts

@@ -412,7 +412,7 @@ async function downloadAssets(
       if (typeof data === 'string') {
         try {
           data = new URL(data);
-        } catch (ignored) {}
+        } catch {}
       }
 
       return { mediaType, data };

packages/ai/src/prompt/data-content.ts

@@ -44,7 +44,7 @@ export function convertToLanguageModelV4DataContent(
   if (typeof content === 'string') {
     try {
       content = new URL(content);
-    } catch (error) {
+    } catch {
       // ignored
     }
   }
@@ -128,7 +128,7 @@ export function convertDataContentToUint8Array(
 export function convertUint8ArrayToText(uint8Array: Uint8Array): string {
   try {
     return new TextDecoder().decode(uint8Array);
-  } catch (error) {
+  } catch {
     throw new Error('Error decoding Uint8Array to text');
   }
 }

packages/ai/src/prompt/split-data-url.ts

@@ -8,7 +8,7 @@ export function splitDataUrl(dataUrl: string): {
       mediaType: header.split(';')[0].split(':')[1],
       base64Content,
     };
-  } catch (error) {
+  } catch {
     return {
       mediaType: undefined,
       base64Content: undefined,

packages/ai/src/telemetry/get-global-telemetry-integration.ts

@@ -34,8 +34,8 @@ export function bindTelemetryIntegration(
 }
 
 export function getGlobalTelemetryIntegration<
-  TOOLS extends ToolSet = ToolSet,
-  OUTPUT extends Output = Output,
+  _TOOLS extends ToolSet = ToolSet,
+  _OUTPUT extends Output = Output,
 >(): (args?: {
   integrations?: TelemetryIntegration | Array<TelemetryIntegration>;
 }) => TelemetryIntegration {

packages/ai/src/ui-message-stream/create-ui-message-stream.ts

@@ -66,7 +66,7 @@ export function createUIMessageStream<UI_MESSAGE extends UIMessage>({
   function safeEnqueue(data: InferUIMessageChunk<UI_MESSAGE>) {
     try {
       controller.enqueue(data);
-    } catch (error) {
+    } catch {
       // suppress errors when the stream has been closed
     }
   }
@@ -129,7 +129,7 @@ export function createUIMessageStream<UI_MESSAGE extends UIMessage>({
   waitForStreams.finally(() => {
     try {
       controller.close();
-    } catch (error) {
+    } catch {
       // suppress errors when the stream has been closed
     }
   });