fix: correct onError middleware syntax in docs

[lindseystead]

Fixes #2517

Removed nested onError function that caused TypeScript error "Cannot find name 'onError'". The correct syntax is to directly return an Error instance from the onError method, not nest another onError function inside it.

Changes

• Fixed incorrect onError syntax in docs/openapi-fetch/middleware-auth.md
• Fixed incorrect onError syntax in docs/openapi-fetch/api.md

The documentation examples now correctly show:
async onError({ error }) {
// wrap errors thrown by fetch
return new Error("Oops, fetch failed", { cause: error });
},Instead of the incorrect nested function syntax that caused TypeScript errors.

How to Review

1. Check that the onError examples in both files now match the correct pattern shown in the test files (packages/openapi-fetch/test/middleware/middleware.test.ts)
2. Verify the syntax aligns with the actual implementation in packages/openapi-fetch/src/index.js
3. Confirm the examples are consistent with other onError examples already in the same documentation files (lines 128-130 in middleware-auth.md)

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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[changeset-bot]

🦋 Changeset detected

Latest commit: 35abf54

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
openapi-fetch	Patch
openapi-react-query	Patch
swr-openapi	Patch

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[lindseystead]

The failing CI tests are in packages/openapi-typescript/test/node-api.test.ts and seem to be due to a 404 from https://raw.githubusercontent.com/Redocly/redocly-cli/.../openapi.yaml, which looks unrelated to this docs-only change. Let me know if you'd like me to adjust anything.

[sacha-c]

The failing CI tests are in packages/openapi-typescript/test/node-api.test.ts and seem to be due to a 404 from https://raw.githubusercontent.com/Redocly/redocly-cli/.../openapi.yaml, which looks unrelated to this docs-only change. Let me know if you'd like me to adjust anything.

Indeed, I've address this in a separate PR a few weeks back which is awaiting review: #2522

[drwpow]

Thank you! Docs changes don’t need a changeset though 🙂