tabbable 5.1.0 on Node.js NPM

3665d0b: The TypeScript return type of tabbable has been fixed: Was Array<Element> (an Element is technically not focusable), is now Array<HTMLElement | SVGElement> (which are both still/also Element instances).
8a25135: Fixed: Tabbable elements in fixed-position (position: fixed) containers should now be consistently found in supported browsers.
9544de2: Replace prepublishOnly script with prepare script. This has the added benefit of running automatically when installing the package from GitHub (as supported by NPM) where the published ./dist directory is not automatically included.
672f4a2: Add focusable() type definition.
2424c0f: Small improvements for improving tree-shakeability of this package. A missing #__PURE__ annotation has been added to allow dropping one of the top-level calls (if its result stays unused) and removed minification of the file referenced as package.json#module to avoid dropping the comments (including existing #__PURE__ annotations).