Improve multi-level subError rendering (eg. nested 'either')

src/aggregrate-errors.js

@@ -30,7 +30,7 @@ if (supportsColor.stderr) {
 	closeColor = "";
 }
 
-function renderErrorList(errors, isSubErrors = false) {
+function renderErrorList(errors, subErrorLevels = 0) {
 	let rephrasedErrors = errors.map((error, i) => {
 		let pathSegments = error.path.map((segment) => {
 			if (segment == null) {
@@ -49,25 +49,23 @@ function renderErrorList(errors, isSubErrors = false) {
 			: "└─";
 
 		let mainLine = asExpression(() => {
-			if (pathSegments.length > 0) {
-				if (isSubErrors) {
-					return `    ${lineCharacter} ${joinPathSegments(pathSegments)}: ${error.message}`;
-				} else {
-					return ` - At ${joinPathSegments(pathSegments)}: ${error.message}`;
-				}
+			if (subErrorLevels > 0) {
+				let message = (pathSegments.length > 0)
+					? `${lineCharacter} ${joinPathSegments(pathSegments)}: ${error.message}`
+					: `${lineCharacter} ${error.message}`;
+
+				return indentString(message, subErrorLevels * 4);
 			} else {
-				if (isSubErrors) {
-					return `    ${lineCharacter} ${error.message}`;
-				} else {
-					return ` - ${error.message}`;
-				}
+				return (pathSegments.length > 0)
+					? ` - At ${joinPathSegments(pathSegments)}: ${error.message}`
+					: ` - ${error.message}`;
 			}
 		});
 
 		if (error.subErrors != null && error.subErrors.length > 0) {
-			let renderedSubErrors = renderErrorList(error.subErrors, true);
+			let renderedSubErrors = renderErrorList(error.subErrors, subErrorLevels + 1);
 
-			return mainLine + "\n" + indentString(renderedSubErrors, 2);
+			return mainLine + "\n" + renderedSubErrors;
 		} else {
 			return mainLine;
 		}