next.js

7f90cce6 - Extend instant error overlay to metadata, viewport, and sync IO errors (#93287)

Extend instant error overlay to metadata, viewport, and sync IO errors (#93287) ### What? Extends the card-based instant error overlay (#92638) to metadata, viewport, and sync IO errors, and updates the matching build/CLI messages to a consistent structured format. ### Why? After the blocking-route redesign, metadata, viewport, and sync IO errors still used the old prose format with no visual fix guidance. ### Demo - Metadata: [runtime](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/12-cookies-in-metadata) · [dynamic](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/13-fetch-in-metadata) - Viewport: [runtime](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/14-cookies-in-viewport) · [dynamic](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/15-fetch-in-viewport) - Sync IO: [Math.random()](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/38-math-random-no-instant) · [Date.now()](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/39-date-now-no-instant) · [crypto.randomUUID()](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/40-crypto-random-no-instant) - Sync IO in Client: [Math.random()](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/44-client-math-random-no-suspense) · [Date.now()](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/43-client-date-no-suspense) · [crypto.randomUUID()](https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/45-client-crypto-no-suspense) - [Fix overview (all cards)](https://error-messages-overhaul-ibsl.labs.vercel.dev/fix-overview) ### How? **Overlay** - New `dynamic-metadata`, `dynamic-viewport`, and `sync-io` error types in `errors.tsx`, all rendered through `InstantRuntimeError` with kind-specific fix cards - `isSyncIOError()` detects sync IO via the docs URL pattern, mirroring `isRuntimeVariant()` **Build & CLI messages** - Headlines aligned to "Next.js encountered..." across all error families - `blocking-route-messages.ts`: metadata/viewport errors restructured from prose to "Ways to fix this:" bullets - Sync IO messages extracted into `sync-io-messages.ts`, mirroring `blocking-route-messages.ts`. Helpers renamed to `createSyncIOError` / `createSyncIORuntimeError` / `createSyncIOClientError` to match the `create*Error` pattern