**content-entry-transform** is a lightweight Node/Deno library that lets you define and apply custom transformers to streams of “content entries”. It provides helpers for intercepting properties, expanding `{{…}}` expressions, and adding or modifying entry fields based on pattern matches, making it useful for developers who need to programmatically reshape or enrich structured content (e.g., CMS data, static‑site generators, or data‑pipeline scripts).