Core Changes

• Turbopack: Add new webpack loader rule/condition syntax in config: #82857
• Turbopack: Un-deprecate the TurbopackLoaderItem type: #83070
• Turbopack: Replace heuristics for detecting manually-configured sass or babel loaders with less-fragile ones, configure rules as a vec and not a map: #83131
• Turbopack: Allow arrays to be used as values in turbopack.rules config: #83138
• [test] Run all dev tests with sourcemaps enabled: #83173
• [devtools] Immediately set meta key in shortcut recorder: #82301
• Turbopack: fix persistent caching test case: #83170
• Implement runtime prefetching via segment opt-in: #83072
• bugfix: Bad next.route on pages dir OTel spans for 404s / 500s: #77150
• [Breaking] Bump minimum Node.js version to >=20.9.0: #83113
• [ppr] RDC for RSCs (redo): #80853

Misc Changes

• Update Rspack development test manifest: #83152
• [turbopack] Change execution and snapshot tests to check for the existence of files rather than directories: #83189
• Update Rspack production test manifest: #83153
• [CNA] use linter preference: #83194
• Turbopack: fix hanging of persistent caching with webpack loaders: #83201
• Turbopack: don't match dynamic pattern for node_modules packages: #83176
• [test] update the metadata deployment cache header tests: #83217
• docs: change API route example file extension to .ts and add JS example with switcher prop: #83044
• [turbopack] Create a simple benchmark to measure the overhead of turbotasks: #82982

Credits

Huge thanks to @vercel-release-bot, @lukesandberg, @bgw, @devjiwonchoi, @sokra, @eps1lon, @mischnic, @acdlite, @huozhi, @evankirkiles, @wo-o29, and @wyattjoh for helping!