1 files changed, 38 insertions, 0 deletions
diff --git a/preact/src/diff/catch-error.js b/preact/src/diff/catch-error.js
new file mode 100644
index 0000000..893a076
--- /dev/null
+++ b/preact/src/diff/catch-error.js
@@ -0,0 +1,38 @@
+/**
+ * Find the closest error boundary to a thrown error and call it
+ * @param {object} error The thrown value
+ * @param {import('../internal').VNode} vnode The vnode that threw
+ * the error that was caught (except for unmounting when this parameter
+ * is the highest parent that was being unmounted)
+ */
+export function _catchError(error, vnode) {
+	/** @type {import('../internal').Component} */
+	let component, ctor, handled;
+
+	for (; (vnode = vnode._parent); ) {
+		if ((component = vnode._component) && !component._processingException) {
+			try {
+				ctor = component.constructor;
+
+				if (ctor && ctor.getDerivedStateFromError != null) {
+					component.setState(ctor.getDerivedStateFromError(error));
+					handled = component._dirty;
+				}
+
+				if (component.componentDidCatch != null) {
+					component.componentDidCatch(error);
+					handled = component._dirty;
+				}
+
+				// This is an error boundary. Mark it as having bailed out, and whether it was mid-hydration.
+				if (handled) {
+					return (component._pendingError = component);
+				}
+			} catch (e) {
+				error = e;
+			}
+		}
+	}
+
+	throw error;
+}