Improve subError rendering

src/aggregrate-errors.js

@@ -4,6 +4,7 @@ const indentString = require("indent-string");
 const supportsColor = require("supports-color");
 const matchVirtualProperty = require("@validatem/match-virtual-property");
 const asExpression = require("as-expression");
+const syncpipe = require("syncpipe");
 
 const AggregrateValidationError = require("./aggregrate-validation-error");
 
@@ -54,7 +55,7 @@ function renderErrorList(errors, subErrorLevels = 0) {
 					? `${lineCharacter} ${joinPathSegments(pathSegments)}: ${error.message}`
 					: `${lineCharacter} ${error.message}`;
 
-				return indentString(message, subErrorLevels * 4);
+				return message;
 			} else {
 				return (pathSegments.length > 0)
 					? ` - At ${joinPathSegments(pathSegments)}: ${error.message}`
@@ -64,8 +65,17 @@ function renderErrorList(errors, subErrorLevels = 0) {
 
 		if (error.subErrors != null && error.subErrors.length > 0) {
 			let renderedSubErrors = renderErrorList(error.subErrors, subErrorLevels + 1);
+			let isLastError = (i === errors.length - 1);
 
-			return mainLine + "\n" + renderedSubErrors;
+			if (subErrorLevels > 0 && !isLastError) {
+				return syncpipe(renderedSubErrors, [
+					(_) => indentString(_, 3),
+					(_) => indentString(_, 1, { indent: "│" }),
+					(_) => mainLine + "\n" + _
+				]);
+			} else {
+				return mainLine + "\n" + indentString(renderedSubErrors, 4);
+			}
 		} else {
 			return mainLine;
 		}

yarn.lock

@@ -1148,6 +1148,13 @@ supports-color@^7.1.0:
   dependencies:
     has-flag "^4.0.0"
 
+syncpipe@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/syncpipe/-/syncpipe-1.0.0.tgz#170340f813150bc8fcb8878b1b9c71ea0ccd3727"
+  integrity sha512-cdiAFTnFJRvUaNPDc2n9CqoFvtIL3+JUMJZrC3kA3FzpugHOqu0TvkgNwmnxPZ5/WjAzMcfMS3xm+AO7rg/j/w==
+  dependencies:
+    assure-array "^1.0.0"
+
 table@^5.2.3:
   version "5.4.6"
   resolved "https://registry.yarnpkg.com/table/-/table-5.4.6.tgz#1292d19500ce3f86053b05f0e8e7e4a3bb21079e"