# impeccable cli-v4.0.0 — CLI 4.0.0

- Product: impeccable (https://whatsnew.fyi/product/impeccable)
- Vendor: impeccable
- Date: 2026-09-04
- Version: cli-v4.0.0
- Original notes: https://github.com/pbakaus/impeccable/releases/tag/cli-v4.0.0
- Permalink: https://whatsnew.fyi/product/impeccable/releases/cli-v4.0.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — npx impeccable runs the binary by resolving a platform package installed as an optional dependency, then the user cache, then a checksum-verified download of the pinned engine release
- **changed** — Downloads without a verifiable checksum are refused rather than run
- **removed** — The JavaScript detector API is no longer exported; the detect function has been removed
- **added** — The same detection rules are available as a WebAssembly module for hosts that cannot run the binary

- **`npx impeccable` runs the binary.** The package resolves a platform package (`@impeccable/cli-<os>-<arch>`) installed as an optional dependency, then the user cache, then a checksum-verified download of the pinned engine release. A download without a verifiable checksum is refused rather than run.

- **The JavaScript detector API is gone.** The package no longer exports a `detect` function; the same rules are available as a WebAssembly module for hosts that cannot run the binary. Every documented command (`detect`, `ignores`, `install`, `update`, `check`, `link`) keeps its name, flags, and output.