util: update set iterator entries inspection

The inspection output for Set#entries() was wrong so far as it did
not return an array as it should have. That was a bug in V8 that is
now fixed and the code in Node.js has to be updated accordingly.

PR-URL: #25941
Fixes: #24629
Reviewed-By: Michaël Zasso <[email protected]>

Author: BridgeAR

lib/internal/util/inspect.js

@@ -594,11 +594,11 @@ function formatRaw(ctx, value, recurseTimes, typedArray) {
     } else if (isMapIterator(value)) {
       keys = getKeys(value, ctx.showHidden);
       braces = [`[${tag}] {`, '}'];
-      formatter = formatMapIterator;
+      formatter = formatIterator;
     } else if (isSetIterator(value)) {
       keys = getKeys(value, ctx.showHidden);
       braces = [`[${tag}] {`, '}'];
-      formatter = formatSetIterator;
+      formatter = formatIterator;
     } else {
       noIterator = true;
     }
@@ -730,10 +730,10 @@ function formatRaw(ctx, value, recurseTimes, typedArray) {
       }
       if (isMapIterator(value)) {
         braces = [`[${tag || 'Map Iterator'}] {`, '}'];
-        formatter = formatMapIterator;
+        formatter = formatIterator;
       } else if (isSetIterator(value)) {
         braces = [`[${tag || 'Set Iterator'}] {`, '}'];
-        formatter = formatSetIterator;
+        formatter = formatIterator;
       // Handle other regular objects again.
       } else if (keys.length === 0) {
         if (isExternal(value))
@@ -1090,12 +1090,7 @@ function formatWeakMap(ctx, value, recurseTimes) {
   return formatMapIterInner(ctx, recurseTimes, entries, kWeak);
 }
 
-function formatSetIterator(ctx, value, recurseTimes) {
-  const entries = previewEntries(value);
-  return formatSetIterInner(ctx, recurseTimes, entries, kIterator);
-}
-
-function formatMapIterator(ctx, value, recurseTimes) {
+function formatIterator(ctx, value, recurseTimes) {
   const [entries, isKeyValue] = previewEntries(value, true);
   if (isKeyValue) {
     return formatMapIterInner(ctx, recurseTimes, entries, kMapEntries);

src/node_util.cc

@@ -100,7 +100,7 @@ static void PreviewEntries(const FunctionCallbackInfo<Value>& args) {
   Local<Array> entries;
   if (!args[0].As<Object>()->PreviewEntries(&is_key_value).ToLocal(&entries))
     return;
-  // Fast path for WeakMap, WeakSet and Set iterators.
+  // Fast path for WeakMap and WeakSet.
   if (args.Length() == 1)
     return args.GetReturnValue().Set(entries);
 

test/parallel/test-util-inspect.js

@@ -995,7 +995,8 @@ if (typeof Symbol !== 'undefined') {
   const aSet = new Set([1, 3]);
   assert.strictEqual(util.inspect(aSet.keys()), '[Set Iterator] { 1, 3 }');
   assert.strictEqual(util.inspect(aSet.values()), '[Set Iterator] { 1, 3 }');
-  assert.strictEqual(util.inspect(aSet.entries()), '[Set Iterator] { 1, 3 }');
+  assert.strictEqual(util.inspect(aSet.entries()),
+                     '[Set Iterator] { [ 1, 1 ], [ 3, 3 ] }');
   // Make sure the iterator doesn't get consumed.
   const keys = aSet.keys();
   assert.strictEqual(util.inspect(keys), '[Set Iterator] { 1, 3 }');
@@ -1609,7 +1610,7 @@ assert.strictEqual(util.inspect('"\'${a}'), "'\"\\'${a}'");
   [{ a: 5 }, '{ a: 5 }'],
   [new Set([1, 2]), 'Set { 1, 2 }'],
   [new Map([[1, 2]]), 'Map { 1 => 2 }'],
-  [new Set([1, 2]).entries(), '[Set Iterator] { 1, 2 }'],
+  [new Set([1, 2]).entries(), '[Set Iterator] { [ 1, 1 ], [ 2, 2 ] }'],
   [new Map([[1, 2]]).keys(), '[Map Iterator] { 1 }'],
   [new Date(2000), '1970-01-01T00:00:02.000Z'],
   [new Uint8Array(2), 'Uint8Array [ 0, 0 ]'],