1 files changed, 68 insertions, 0 deletions
diff --git a/thirdparty/preact/src/util.js b/thirdparty/preact/src/util.js
new file mode 100644
index 000000000..d2e63b090
--- /dev/null
+++ b/thirdparty/preact/src/util.js
@@ -0,0 +1,68 @@
+/** Copy own-properties from `props` onto `obj`.
+ *	@returns obj
+ *	@private
+ */
+export function extend(obj, props) {
+	if (props) {
+		for (let i in props) obj[i] = props[i];
+	}
+	return obj;
+}
+
+
+/** Fast clone. Note: does not filter out non-own properties.
+ *	@see https://esbench.com/bench/56baa34f45df6895002e03b6
+ */
+export function clone(obj) {
+	return extend({}, obj);
+}
+
+
+/** Get a deep property value from the given object, expressed in dot-notation.
+ *	@private
+ */
+export function delve(obj, key) {
+	for (let p=key.split('.'), i=0; i<p.length && obj; i++) {
+		obj = obj[p[i]];
+	}
+	return obj;
+}
+
+
+/** @private is the given object a Function? */
+export function isFunction(obj) {
+	return 'function'===typeof obj;
+}
+
+
+/** @private is the given object a String? */
+export function isString(obj) {
+	return 'string'===typeof obj;
+}
+
+
+/** Convert a hashmap of CSS classes to a space-delimited className string
+ *	@private
+ */
+export function hashToClassName(c) {
+	let str = '';
+	for (let prop in c) {
+		if (c[prop]) {
+			if (str) str += ' ';
+			str += prop;
+		}
+	}
+	return str;
+}
+
+
+/** Just a memoized String#toLowerCase */
+let lcCache = {};
+export const toLowerCase = s => lcCache[s] || (lcCache[s] = s.toLowerCase());
+
+
+/** Call a function asynchronously, as soon as possible.
+ *	@param {Function} callback
+ */
+let resolved = typeof Promise!=='undefined' && Promise.resolve();
+export const defer = resolved ? (f => { resolved.then(f); }) : setTimeout;