import { toChildArray } from 'preact'; const mapFn = (children, fn) => { if (!children) return null; return toChildArray(children).reduce( (acc, value, index) => acc.concat(fn(value, index)), [] ); }; // This API is completely unnecessary for Preact, so it's basically passthrough. export const Children = { map: mapFn, forEach: mapFn, count(children) { return children ? toChildArray(children).length : 0; }, only(children) { children = toChildArray(children); if (children.length !== 1) { throw new Error('Children.only() expects only one child.'); } return children[0]; }, toArray: toChildArray };