1 files changed, 51 insertions, 26 deletions

diff --git a/src/util/sugar.js b/src/util/sugar.js
index 5b1f3193..14fb250e 100644
--- a/src/util/sugar.js
+++ b/src/util/sugar.js
@@ -6,7 +6,7 @@
 // It will likely only do exactly what I want it to, and only in the cases I
 // decided were relevant enough to 8other handling.
 
-import {color} from './cli.js';
+import {colors} from './cli.js';
 
 // Apparently JavaScript doesn't come with a function to split an array into
 // chunks! Weird. Anyway, this is an awesome place to use a generator, even
@@ -168,12 +168,24 @@ export function setIntersection(set1, set2) {
   return intersection;
 }
 
-export function filterProperties(obj, properties) {
-  const set = new Set(properties);
-  return Object.fromEntries(
-    Object
-      .entries(obj)
-      .filter(([key]) => set.has(key)));
+export function filterProperties(object, properties) {
+  if (typeof object !== 'object' || object === null) {
+    throw new TypeError(`Expected object to be an object, got ${object}`);
+  }
+
+  if (!Array.isArray(properties)) {
+    throw new TypeError(`Expected properties to be an array, got ${properties}`);
+  }
+
+  const filteredObject = {};
+
+  for (const property of properties) {
+    if (Object.hasOwn(object, property)) {
+      filteredObject[property] = object[property];
+    }
+  }
+
+  return filteredObject;
 }
 
 export function queue(array, max = 50) {
@@ -532,15 +544,17 @@ export function showAggregate(topError, {
   print = true,
 } = {}) {
   const recursive = (error, {level}) => {
-    let header = showTraces
+    let headerPart = showTraces
       ? `[${error.constructor.name || 'unnamed'}] ${
           error.message || '(no message)'
         }`
       : error instanceof AggregateError
       ? `[${error.message || '(no message)'}]`
       : error.message || '(no message)';
+
     if (showTraces) {
       const stackLines = error.stack?.split('\n');
+
       const stackLine = stackLines?.find(
         (line) =>
           line.trim().startsWith('at') &&
@@ -548,30 +562,41 @@ export function showAggregate(topError, {
           !line.includes('node:') &&
           !line.includes('<anonymous>')
       );
+
       const tracePart = stackLine
         ? '- ' +
           stackLine
             .trim()
             .replace(/file:\/\/.*\.js/, (match) => pathToFileURL(match))
         : '(no stack trace)';
-      header += ` ${color.dim(tracePart)}`;
-    }
-    const bar = level % 2 === 0 ? '\u2502' : color.dim('\u254e');
-    const head = level % 2 === 0 ? '\u257f' : color.dim('\u257f');
-
-    if (error instanceof AggregateError) {
-      return (
-        header +
-        '\n' +
-        error.errors
-          .map((error) => recursive(error, {level: level + 1}))
-          .flatMap((str) => str.split('\n'))
-          .map((line, i) => i === 0 ? ` ${head} ${line}` : ` ${bar} ${line}`)
-          .join('\n')
-      );
-    } else {
-      return header;
+
+      headerPart += ` ${colors.dim(tracePart)}`;
     }
+
+    const head1 = level % 2 === 0 ? '\u21aa' : colors.dim('\u21aa');
+    const bar1 = ' ';
+
+    const causePart =
+      (error.cause
+        ? recursive(error.cause, {level: level + 1})
+            .split('\n')
+            .map((line, i) => i === 0 ? ` ${head1} ${line}` : ` ${bar1} ${line}`)
+            .join('\n')
+        : '');
+
+    const head2 = level % 2 === 0 ? '\u257f' : colors.dim('\u257f');
+    const bar2 = level % 2 === 0 ? '\u2502' : colors.dim('\u254e');
+
+    const aggregatePart =
+      (error instanceof AggregateError
+        ? error.errors
+            .map(error => recursive(error, {level: level + 1}))
+            .flatMap(str => str.split('\n'))
+            .map((line, i) => i === 0 ? ` ${head2} ${line}` : ` ${bar2} ${line}`)
+            .join('\n')
+        : '');
+
+    return [headerPart, causePart, aggregatePart].filter(Boolean).join('\n');
   };
 
   const message =
@@ -593,7 +618,7 @@ export function decorateErrorWithIndex(fn) {
     try {
       return fn(x, index, array);
     } catch (error) {
-      error.message = `(${color.yellow(`#${index + 1}`)}) ${error.message}`;
+      error.message = `(${colors.yellow(`#${index + 1}`)}) ${error.message}`;
       throw error;
     }
   };