v15.4.0-canary.85

Core Changes

• fix: Rspack dev gets stuck after removing a page: #80555
• Ensure custom relative distDir resolves properly: #80569
• fix: mark file system incremental cache as external so it's memory is shared: #80586
• [fix] clone the config module to avoid mutation: #80573
• Improve Incremental Cache Locking Algorithm: #80497
• [devtools] add feature flag for new panel ui: #80251
• [devtools] fork devtools-indicator: #80456
• [devtools] fork next-logo: #80457
• guarantee cache busting param correctness: #80381
• Normalize filepaths when parsing patterns from js values: #80511

Misc Changes

• perf(turbopack): Introduce runtime analysis for immutable tasks: #80422
• perf(turbopack): Do not allocate vectors if we are not going to use it: #80504
• test: fix failures caused by format discrepancies between rspack and other bundlers: #80314
• perf(turbopack): Detect more immutable tasks: #80423
• docs: streaming metadata, dynamic pages and generateMetadata: #80453
• Turbopack: correct export usage in EcmascriptModulePartReference: #80526
• Turbopack: make another callback return a result: #80608
• Remove turbo_tasks::function from AssetContext::layer: #80592
• build(turbopack): Update swc_core to v27.0.6: #80626
• Update Rspack production test manifest: #80598
• Update Turbopack production test manifest: #80600
• Update Turbopack development test manifest: #80599
• Update Rspack development test manifest: #80597
• Turbopack: resolve sourceMap.file: #80625
• perf(turbopack): Mark async fns without await as non-async: #80628

Credits

Huge thanks to @kdy1, @ScriptedAlchemy, @SyMind, @icyJoseph, @mischnic, @ijjk, @wyattjoh, @huozhi, @devjiwonchoi, @lukesandberg, and @gaojude for helping!