Astro [email protected] — Release Notes & Engineering Impact

### Minor Changes - [#17767](https://github.com/withastro/astro/pull/17767) [`ce7c91f`](https://github.com/withastro/astro/commit/ce7c91f77dbd7be03c04bc13f87af9d01fef6cef) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Adds `--ignore-lock` flag to `astro preview`, allowing multiple preview servers to run simultaneously on different ports. This is useful for E2E testing workflows (e.g., Playwright) that need to run several preview servers at once. - [#17818](https://github.com/withastro/astro/pull/17818) [`c0b6581`](https://github.com/withastro/astro/commit/c0b65811dfa0dafa1aa04b7d6d67fd09250ff8c1) Thanks [@florian-lefebvre](https://github.com/florian-lefebvre)! - Adds a `logger` parameter to image services hooks Custom image services now receive Astro's runtime logger as an extra argument. Messages logged with it are routed through the destination configured in `logger` and respect your log level, instead of being written straight to the console: ```ts import type { LocalImageService } from 'astro'; const service: LocalImageService = { // ... async transform(inputBuffer, transform, imageConfig, logger) { logger.warn(`Could not optimize "${transform.src}". Passing it through unchanged.`); return { data: inputBuffer, format: 'png' }; }, }; ``` Astro's built-in Sharp service now uses this logger for the warnings it emits when it encounters an unexpected or unsupported source format. - [#17818](https://github.com/withastro/astro/pull/17818) [`c0b6581`](https://github.com/withastro/astro/commit/c0b65811dfa0dafa1aa04b7d6d67fd09250ff8c1) Thanks [@florian-lefebvre](https://github.com/florian-lefebvre)! - Adds `logger` to the context object passed to cache providers Custom cache providers now receive Astro's runtime logger on the context passed to `onRequest()`. Messages logged with it are routed through the destination configured in `logger` and respect your log level, instead of being written straight to the console: ```ts import type { CacheProvider } from 'astro'; const provider: CacheProvider = { name: 'my-cache', async onRequest({ request, url, logger }, next) { logger.warn(`Skipping cache for ${url.pathname} because the response sets a cookie.`); return next(); }, // ... }; ``` Astro's built-in `memoryCache()` provider now uses this logger for the warnings it emits when it skips caching a response that sets cookies, and when a background revalidation fails. ### Patch Changes - [#17818](https://github.com/withastro/astro/pull/17818) [`c0b6581`](https://github.com/withastro/astro/commit/c0b65811dfa0dafa1aa04b7d6d67fd09250ff8c1) Thanks [@florian-lefebvre](https://github.com/florian-lefebvre)! - Updates Astro's remaining internal warnings and errors to be written through the configured logger instead of directly to the console, when possible - [#17886](https://github.com/withastro/astro/pull/17886) [`e747cba`](https://github.com/withastro/astro/commit/e747cba07fcd2b9e7fb03c02ed42abfe2079daa2) Thanks [@matthewp](https://github.com/matthewp)! - Fixes the memory cache provider to skip responses with `Vary: Cookie` or `Vary: *` - [#17885](https://github.com/withastro/astro/pull/17885) [`916b738`](https://github.com/withastro/astro/commit/916b738b0447728f1c274e32677c9bac09be78f6) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Improves build performance for sites with a large number of pages coming from a large amount of different modules. - [#17795](https://github.com/withastro/astro/pull/17795) [`15e2deb`](https://github.com/withastro/astro/commit/15e2debc7e81d353410ff76a76c3bf75b7fb3070) Thanks [@matthewp](https://github.com/matthewp)! - Adds concurrent rendering support for `experimental.incrementalBuild`, including when using `@astrojs/cloudflare` Incremental builds no longer disable caching when `build.concurrency` is greater than `1`. Projects that set `build.concurrency: 1` to keep the cache enabled can remove that workaround. Cloudflare builds also reduce serialization overhead for large prerendered pages. - [#17879](https://github.com/withastro/astro/pull/17879) [`21c34a6`](https://github.com/withastro/astro/commit/21c34a6816372220157ff7e6b697275360d3e367) Thanks [@matthewp](https://github.com/matthewp)! - Fixes missing styles, links, and scripts from content collection entries rendered inside server islands - [#17861](https://github.com/withastro/astro/pull/17861) [`3193988`](https://github.com/withastro/astro/commit/3193988d0566f53ecd10b03cd18669dcf230c8d6) Thanks [@ethanstoner](https://github.com/ethanstoner)! - Fixes i18n fallback routes being generated with a corrupted path when the locale code also appears at the start of a later path segment. A page such as `src/pages/en/enterprise.astro` with `fallback: { es: 'en' }` produced the route `/es/esterprise` instead of `/es/enterprise`, so the fallback never matched the intended URL. Only the leading locale segment is rewritten now.