Also render subErrors as a tree for root-level errors

src/aggregrate-errors.js

@@ -29,7 +29,7 @@ if (supportsColor.stderr) {
 	closeColor = "";
 }
 
-function renderErrorList(errors, basePath = []) {
+function renderErrorList(errors, isSubErrors = false) {
 	let rephrasedErrors = errors.map((error, i) => {
 		let pathSegments = error.path.map((segment) => {
 			if (segment == null) {
@@ -47,13 +47,13 @@ function renderErrorList(errors, basePath = []) {
 			? "├─"
 			: "└─";
 
-		let mainLine = (basePath.length > 0)
+		let mainLine = (isSubErrors)
 			// ? `... -> ${joinPathSegments(pathSegments)}: ${error.message}`
 			? `    ${lineCharacter} ${joinPathSegments(pathSegments)}: ${error.message}`
 			: ` - At ${joinPathSegments(pathSegments)}: ${error.message}`;
 
 		if (error.subErrors != null && error.subErrors.length > 0) {
-			let renderedSubErrors = renderErrorList(error.subErrors, error.path);
+			let renderedSubErrors = renderErrorList(error.subErrors, true);
 
 			return mainLine + "\n" + indentString(renderedSubErrors, 2);
 		} else {