util: change items unknown style

We mainly use <> to visualize special information that is not
directly visible as property.

PR-URL: #20792
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>

lib/util.js

@@ -610,14 +610,14 @@ function formatValue(ctx, value, recurseTimes, ln) {
  if (ctx.showHidden) {
  formatter = formatWeakSet;
  } else {
- extra = '[items unknown]';
+ extra = '<items unknown>';
  }
  } else if (isWeakMap(value)) {
  braces[0] = `${getPrefix(constructor, tag)}{`;
  if (ctx.showHidden) {
  formatter = formatWeakMap;
  } else {
- extra = '[items unknown]';
+ extra = '<items unknown>';
  }
  } else if (types.isModuleNamespaceObject(value)) {
  braces[0] = `[${tag}] {`;

test/parallel/test-util-inspect.js

@@ -1310,7 +1310,7 @@ util.inspect(process);
  assert.strictEqual(out, expect);
 
  out = util.inspect(weakMap);
- expect = 'WeakMap { [items unknown] }';
+ expect = 'WeakMap { <items unknown> }';
  assert.strictEqual(out, expect);
 
  out = util.inspect(weakMap, { maxArrayLength: 0, showHidden: true });
@@ -1334,7 +1334,7 @@ util.inspect(process);
  assert.strictEqual(out, expect);
 
  out = util.inspect(weakSet);
- expect = 'WeakSet { [items unknown] }';
+ expect = 'WeakSet { <items unknown> }';
  assert.strictEqual(out, expect);
 
  out = util.inspect(weakSet, { maxArrayLength: -2, showHidden: true });