This site describes solve-engine as it is on main: 2.43.0, which npm does not have yet. npm installs 2.40.0, so a page may show an answer that version does not give yet.
CONSTANTS_PACKAGE
const CONSTANTS_PACKAGE: IEnginePackage;Defined in: packages/engine/src/packages/constants/ConstantsPackage.ts:18
Named physical and mathematical constants (issue #256): speed of light,
gravity, avogadro, planck, tau, golden ratio and more. On by default
and removable.
A constant with a unit (the speed of light in m/s, gravity in m/s²) becomes a
Uom value, so it converts and takes part in unit arithmetic: gravity * 70 kg as N is a force. The multi-word constants are fused phrases; the single-word
ones are keywords. pi and e already exist in the language and are left
untouched.