hastscript is a utility for creating Hast (HTML Abstract Syntax Tree) trees using a hyperscript-like API. It provides two main functions, `h` for HTML and `s` for SVG, which accept CSS-like selectors, properties, and children to construct virtual DOM nodes. The library is designed to be used in build tools and frameworks that work with the Hast syntax tree, such as those in the Unified collective. The core of the library is the `createH` function in `lib/create-h.js`, which is a parameterized hyperscript function that can be adapted for different domains (like HTML or SVG) by providing a schema and default tag name. Additionally, the library supports JSX via automatic and classic runtimes, implemented in `lib/create-automatic-runtime.js` and wired up in `lib/index.js`. The project is well-maintained, with recent commits and active CI workflows, and shows low technical drift with up-to-date dependencies.