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sample/dev/talk/bundle/mithril-2.2.2/render/vnode.js

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+"use strict"
+
+function Vnode(tag, key, attrs, children, text, dom) {
+	return {tag: tag, key: key, attrs: attrs, children: children, text: text, dom: dom, domSize: undefined, state: undefined, events: undefined, instance: undefined}
+}
+Vnode.normalize = function(node) {
+	if (Array.isArray(node)) return Vnode("[", undefined, undefined, Vnode.normalizeChildren(node), undefined, undefined)
+	if (node == null || typeof node === "boolean") return null
+	if (typeof node === "object") return node
+	return Vnode("#", undefined, undefined, String(node), undefined, undefined)
+}
+Vnode.normalizeChildren = function(input) {
+	var children = []
+	if (input.length) {
+		var isKeyed = input[0] != null && input[0].key != null
+		// Note: this is a *very* perf-sensitive check.
+		// Fun fact: merging the loop like this is somehow faster than splitting
+		// it, noticeably so.
+		for (var i = 1; i < input.length; i++) {
+			if ((input[i] != null && input[i].key != null) !== isKeyed) {
+				throw new TypeError(
+					isKeyed && (input[i] != null || typeof input[i] === "boolean")
+						? "In fragments, vnodes must either all have keys or none have keys. You may wish to consider using an explicit keyed empty fragment, m.fragment({key: ...}), instead of a hole."
+						: "In fragments, vnodes must either all have keys or none have keys."
+				)
+			}
+		}
+		for (var i = 0; i < input.length; i++) {
+			children[i] = Vnode.normalize(input[i])
+		}
+	}
+	return children
+}
+
+module.exports = Vnode