# What changed in cn > 32 changes in cn 0.2 to 0.5 from its official release notes, upgrade guides and advisories: 2 breaking, 3 new APIs and options. Each one cited. Sources checked 2026-10-18. HTML: https://unstale.sh/npm/cn/ To see which of these apply to a repository, run `npx @unstale/cli init` in it. ## cn 0.5 ### Breaking changes - The build command drops names declared before a --*: initial reset. (0.5.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.5.0) - Node 20 is no longer supported; Node 22 or later is required. (0.5.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.5.0) ### Behavior and default changes - The build command now follows package @imports. (0.5.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.5.0) ### Fixes and other changes - The build command reads @theme declarations that appear after nested blocks such as @keyframes. (0.5.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.5.0) ## cn 0.4 ### Behavior and default changes - cn build and the plugins now register theme scales declared in Tailwind CSS. (0.4.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.4.0) ## cn 0.3 ### New APIs and options - Adds a library entry point with build(options), letting build scripts and bundler plugins run scanning, subsetting, compiling, and writing directly. (0.3.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.3.0) - Adds the cn/next entry point. (0.3.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.3.0) - Adds the cn/vite entry point. (0.3.0) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.3.0) ### Performance - Calls with an interpolated argument no longer thrash the argument cache, improving performance for that call shape; stable arguments are unchanged. (0.3.3) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.3.3) ### Behavior and default changes - Axis utilities now override the logical sides they cover, matching tailwind-merge 3.7.0. For example, px-2 replaces ps-* and pe-*. (0.3.1) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.3.1) ### Fixes and other changes - The generated .ts output typechecks with noUncheckedIndexedAccess and the rest of the @tsconfig/strictest flags; the .mjs output is unchanged. (0.3.3) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.3.3) - Custom animate-* classes are no longer merged, matching tailwind-merge; plugin classes such as animate-in, animate-once, and animate-duration-500 are never dropped. (0.3.2) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.3.2) ## cn 0.2 ### Performance - Object and array arguments resolve in place and use the argument-identity cache, avoiding a full clsx join on every call. (0.2.3) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.3) - A single array argument uses the argument path, allowing stable element identities to hit the cache. (0.2.3) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.3) - The argument-cache bucket now holds 256 tuples instead of 8, reducing evictions when many usage sites share a base string. (0.2.3) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.3) - Freshly joined strings pass through a doorkeeper before the whole-string cache, preventing arbitrary dynamic values from churning both caches. (0.2.3) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.3) - On JavaScriptCore, the whole-string cache uses a Map and an inlinable hit path, improving cache hits and recurring single-string calls on bun. (0.2.3) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.3) - Warm calls with four or more arguments now probe predictions in place and allocate nothing, reducing call time from about 44ns to 32ns. (0.2.1) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.1) ### Behavior and default changes - Config extensions accept readonly arrays, allowing token tuples declared with as const to work without a defensive copy. (0.2.5) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.5) ### Fixes and other changes - Fixes merging for containment. (0.2.6) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.6) - Fixes merging for custom animations. (0.2.6) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.6) - Fixes merging for legacy gradients. (0.2.6) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.6) - Fixes missing Tailwind v4 utilities in merging. (0.2.6) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.6) - The generated output file is excluded from content scans when its path matches a content glob. (0.2.5) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.5) - Extensions accept a single class or theme definition instead of throwing. (0.2.5) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.5) - Fixes brace globs, dot-directory and symlink scanning, and CLI error reporting for content builds. (0.2.4) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.4) - Fixes a hang and dropped classes when tracking conflicts with large custom configs and merges. (0.2.4) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.4) - Matches tailwind-merge on array-like values passed to twJoin. (0.2.4) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.4) - Matches tailwind-merge on Unicode whitespace. (0.2.4) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.4) - Fix the published types for cn/config, which pointed at an internal chunk with mangled export names and omitted defaultConfig and mergeConfigs. (0.2.2) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.2) - Fix the published type for clsx in cn/lite, which incorrectly accepted zero parameters. (0.2.2) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.2) - Fix conflict detection silently failing after 2^31 cache-missing merges in one process. (0.2.2) — [release notes](https://github.com/shadcn-ui/cn/releases/tag/cn%400.2.2)