preact/compat/src/Children.js


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import { toChildArray } from 'preact';

const mapFn = (children, fn) => {
	if (children == null) return null;
	return toChildArray(toChildArray(children).map(fn));
};

// 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) {
		const normalized = toChildArray(children);
		if (normalized.length !== 1) throw 'Children.only';
		return normalized[0];
	},
	toArray: toChildArray
};