Support subError inspection in origin comparison

src/are-errors-from-same-origin.js

@@ -3,14 +3,26 @@
 const areArraysEqual = require("./are-arrays-equal");
 
 module.exports = function areErrorsFromSameOrigin(errors) {
-	let seenPath = null;
+	let referencePath = null;
 
+	function checkErrors(errors, basePath = []) {
 		return errors.every((error) => {
-		if (seenPath == null) {
-			seenPath = error.path;
-			return true;
-		} else {
-			return areArraysEqual(seenPath, error.path);
+			let absolutePath = basePath.concat(error.path);
+
+			if (referencePath == null) {
+				// Whatever we encounter first is the reference path. However, we don't return `true` here; even if we assume the error's own path to be correct (since it's the reference path...), the error may still have subErrors with a different path!
+				referencePath = absolutePath;
 			}
+			
+			let subErrorsEqual = (error.subErrors != null)
+				? checkErrors(error.subErrors, absolutePath)
+				: true;
+
+			let selfEqual = areArraysEqual(referencePath, absolutePath);
+
+			return (selfEqual && subErrorsEqual);
 		});
+	}
+
+	return checkErrors(errors);
 };