metro

• [Breaking]: Widen Resolution union returned by resolvers to allow type: 'virtualModule', pending implementation. (https://github.com/react/metro/commit/8336654cd1416a80898b220102dae89ceef892fe by @robhogan)
• [Feature]: allowOptionalDependencies defaults to true to align with RN and Expo (https://github.com/react/metro/pull/1775 by @robhogan)
• [Fix]: Preserve accumulated and trailing config state when mergeConfig encounters an async config in a config chain (https://github.com/react/metro/pull/1754 by @durvesh1992)
• [Performance] Don't rename require in bundle output, improve cold build time ~5%`(TBD by @robhogan)

NOTE: Experimental features are not covered by semver and can change at any time.

• [Experimental]: experimentalImportSupport: Support namespace re-exports, such as export * as Name from "module" (https://github.com/react/metro/pull/1768 by @robhogan and @krystofwoldrich)
• [Experimental]: experimentalImportSupport: Fix exports renamed by destructuring, and support exports of rest spreads (https://github.com/react/metro/pull/1772 by @robhogan)
• [Experimental]: experimentalImportSupport: Fix precedence so explicit export default and named exports win over export * from (https://github.com/react/metro/pull/1773 by @robhogan)
• [Experimental]: experimentalImportSupport: Evaluate export from dependencies in the module prelude instead of within or after the module body (https://github.com/react/metro/pull/1774 by @robhogan)

Full Changelog: https://github.com/react/metro/compare/v0.86.0...v0.87.0

• [Breaking]: Metro now always emits whole-bundle source maps as index maps, and stores each module's map internally as a VlqMap (https://github.com/react/metro/pull/1764, https://github.com/react/metro/pull/1765 by @robhogan). Custom serialisers/transformers must consume/provide VlqMap mappings, not tuples.
• [Breaking]: Remove deprecated default exports from public entry points (https://github.com/react/metro/pull/1759 by @robhogan)
• [Breaking]: Remove support for deprecated YAML and .es6 config files (https://github.com/react/metro/pull/1752 by @robhogan)
• [Breaking]: Remove long-deprecated resolver.blacklistRE config in favour of blockList (https://github.com/react/metro/pull/1758 by @robhogan)
• [Fix]: Fix HttpStore write retries incorrectly using the read endpoint's config (https://github.com/react/metro/pull/1751 by @durvesh1992)
• [Performance]: Source maps work makes Metro use 50% less memory and serve source maps 2x faster, for faster RNDT loads (https://github.com/react/metro/pull/1741, https://github.com/react/metro/pull/1742, https://github.com/react/metro/pull/1743, https://github.com/react/metro/pull/1760, https://github.com/react/metro/pull/1763, https://github.com/react/metro/pull/1764, https://github.com/react/metro/pull/1765 by @robhogan)

Full Changelog: https://github.com/react/metro/compare/v0.85.0...v0.86.0

• [Breaking]: Raise minimum supported Node.js version to 22 (https://github.com/react/metro/pull/1715 by @huntie)
• [Feature]: Implement PACKAGE_SELF_RESOLVE for self-referencing imports in the resolver (https://github.com/react/metro/pull/1721 by @robhogan)
• [Fix]: Add ESM unwrapping to all CommonJS require calls (https://github.com/react/metro/pull/1675 by @kitten)
• [Fix]: Fix Windows cross-drive path resolution in metro-file-map (https://github.com/react/metro/pull/1711 by @kitten)
• [Fix]: Fix "browser"-spec bare-specifier → relative path redirects for nested and first-party package.jsons (https://github.com/react/metro/pull/1720 by @robhogan)
• [Fix]: Gracefully reject illegal "browser"-spec redirects of a bare specifier to an absolute path (https://github.com/react/metro/commit/e1f4d61842a99cd3f8cde0e8cfd135210d6fec3d by @robhogan)
• [Performance]: Avoid intermediate allocations in matchSubpathFromMainFields, improving overall resolver performance ~5% (https://github.com/react/metro/commit/9341463424ef7753d2d17ef0d6943f3610a4e23a by @robhogan)

Full Changelog: https://github.com/react/metro/compare/v0.84.4...v0.85.0

• [Feature]: Support /[metro-watchFolders]/n/ paths for .bundle and .map requests (https://github.com/facebook/metro/pull/1695 by @huntie)
• [Fix]: Fix regression to allow scale assets to be resolved again for single asset requests (https://github.com/facebook/metro/pull/1694 by @kitten)
• [Fix]: Treat import().catch(), etc. as optional under transformer.allowOptionalDependencies (https://github.com/facebook/metro/pull/1697 by @robhogan)
• [Performance]: Interleave resolution attempts with building node_modules candidate paths (https://github.com/facebook/metro/pull/1680 by @kitten)

Full Changelog: https://github.com/facebook/metro/compare/v0.84.3...v0.84.4

This release is on the 0.83.x branch

• [Feature]: Support /[metro-watchFolders]/n/ paths for .bundle and .map requests (https://github.com/facebook/metro/pull/1695 by @huntie)
• [Fix]: Fix regression to allow scale assets to be resolved again for single asset requests (https://github.com/facebook/metro/pull/1694 by @kitten)
• [Fix]: Treat import().catch(), etc. as optional under transformer.allowOptionalDependencies (https://github.com/facebook/metro/pull/1697 by @robhogan)
• [Performance]: Interleave resolution attempts with building node_modules candidate paths (https://github.com/facebook/metro/pull/1680 by @kitten)

Full Changelog: https://github.com/facebook/metro/compare/v0.83.6...v0.83.7

This release is on the 0.83.x branch

• [Feature]: Add keepalive "heartbeat" message to Fast Refresh connections (https://github.com/facebook/metro/pull/1685 by @robhogan)
• [Feature]: Add changeId metadata on HMRClient update-done messages (https://github.com/facebook/metro/commit/1585e444284f by @huntie)
• [Fix]: Include user-defined Babel config in transformer cache key to ensure correctness (https://github.com/facebook/metro/pull/1638 by @evanbacon)
• [Fix]: Detection of contents of directories moved or cloned into a watched location (https://github.com/facebook/metro/pull/1660 by @robhogan)
• [Fix]: Correctly detect contents as removed when a watched directory is moved, on macOS without Watchman (https://github.com/facebook/metro/commit/c9e9fe64a77c by @robhogan)
• [Performance]: Optimize PackageCache: use Map/Set, cache null results, eliminate per-hit allocations (https://github.com/facebook/metro/commit/877b64ea5967 by @robhogan)
• [Types]: Restore type exports from metro that were previously TypeScript-specific (https://github.com/facebook/metro/pull/1672 by @robhogan)

NOTE: Experimental features are not covered by semver and can change at any time.

• [Experimental]: Add config.unstable_fileMapPlugins (https://github.com/facebook/metro/commit/567aa8b62b95 by @robhogan)

• [Feature]: Add keepalive "heartbeat" message to Fast Refresh connections (https://github.com/facebook/metro/pull/1685 by @robhogan)
• [Feature]: Add changeId metadata on HMRClient update-done messages (https://github.com/facebook/metro/commit/1585e444284f by @huntie)
• [Feature]: config.server.tls now sets Metro to be exposed as an https server (#1657 by @vzaidman)
• [Fix]: sync bundling progress between Metro cli and app hints (34ca6a6f621521a0780a54eeb32384b4f9c2f8ff by @vzaidman)
• [Fix]: Include user-defined Babel config in transformer cache key to ensure correctness (https://github.com/facebook/metro/pull/1638 by @evanbacon)
• [Fix]: Detection of contents of directories moved or cloned into a watched location (https://github.com/facebook/metro/pull/1660 by @robhogan)
• [Fix]: Correctly detect contents as removed when a watched directory is moved, on macOS without Watchman (https://github.com/facebook/metro/commit/c9e9fe64a77c by @robhogan)
• [Performance]: Optimize PackageCache: use Map/Set, cache null results, eliminate per-hit allocations (https://github.com/facebook/metro/commit/877b64ea5967 by @robhogan)
• [Types]: Restore type exports from metro that were previously TypeScript-specific (https://github.com/facebook/metro/pull/1672 by @robhogan)

NOTE: Experimental features are not covered by semver and can change at any time.

• [Experimental]: Add config.unstable_fileMapPlugins (https://github.com/facebook/metro/commit/567aa8b62b95 by @robhogan)

Full Changelog: https://github.com/facebook/metro/compare/v0.84.2...v0.84.3

This is a hotfix on the 0.83.x branch.

• [Feature]: config.server.tls now sets Metro to be exposed as an https server (#1657 by @vzaidman)
• [Fix]: sync bundling progress between Metro cli and app hints (34ca6a6f621521a0780a54eeb32384b4f9c2f8ff by @vzaidman)
• [Types]: Restore accidentally removed publication of TypeScript types (#1662 by @robhogan)

Full Changelog: https://github.com/facebook/metro/compare/v0.83.4...v0.83.5

• [Types]: Restore publishing of TypeScript types to npm (https://github.com/facebook/metro/pull/1662 by @robhogan)

Full changelog: https://github.com/facebook/metro/compare/v0.84.1...v0.84.2

• [Fix] sync bundling progress between Metro cli and app hints (34ca6a6f621521a0780a54eeb32384b4f9c2f8ff by @vzaidman)
• [Feature] config.server.tls now sets Metro to be exposed as an https server (35ff94bec847b3ef6ea5f9d81a368cff4df64926 by @vzaidman)

Full Changelog: https://github.com/facebook/metro/compare/v0.84.0...v0.84.1