New Features

• Improved cache size performance via better handling of serialization for errors and bigints by @alexander-akait in #17282
• Introduce an export default handler function option for ProgressPlugin by @alexander-akait in #17312
• Support passing RegExp to splitChunks.chunks by @hyf0 in #17332

Bug Fixes

• Fix layer capabilities for ContextModule types by @huozhi in #17310
• Fix compatibility of __non_webpack_require__ with ES modules by @alexander-akait in #17308
• Improve type coverage Chunk, ChunkGroup, and other plugins by @alexander-akait in #1731
• Do not add js extension for eval source maps when extension is not resolvable by @alexander-akait in #17331

Developer Experience

• Improve type coverage for Json Module type and lazy load json-assertions package by @alexander-akait in #17301

Dependencies & Maintenance

• Bump memfs from 3.5.1 to 3.5.2 by @dependabot in #17315
• Bump webpack-cli from 5.1.1 to 5.1.3 by @dependabot in #17314
• Bump eslint from 8.41.0 to 8.42.0 by @dependabot in #17313

New Contributors

• @huozhi made their first contribution in #17310
• @hyf0 made their first contribution in #17332

Full Changelog: v5.85.1...v5.86.0