util: improve proxy inspection

This makes sure the brace is actually handled as any other brace.
It was handled differently so far than any other brace and that had
an impact on how the output would be formatted.

PR-URL: #26919
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/util/inspect.js

@@ -423,8 +423,7 @@ function formatProxy(ctx, proxy, recurseTimes) {
     formatValue(ctx, proxy[1], recurseTimes)
   ];
   ctx.indentationLvl -= 2;
-  const str = reduceToSingleString(ctx, res, '', ['[', ']']);
-  return `Proxy ${str}`;
+  return reduceToSingleString(ctx, res, '', ['Proxy [', ']']);
 }
 
 function findTypedConstructor(value) {

test/parallel/test-util-inspect-proxy.js

@@ -49,7 +49,8 @@ assert.strictEqual(handler, details[1]);
 
 assert.strictEqual(
   util.inspect(proxyObj, opts),
-  'Proxy [ [ 1, 2, 3 ],\n' +
+  'Proxy [\n' +
+  '  [ 1, 2, 3 ],\n' +
   '  { getPrototypeOf: [Function: getPrototypeOf],\n' +
   '    setPrototypeOf: [Function: setPrototypeOf],\n' +
   '    isExtensible: [Function: isExtensible],\n' +
@@ -86,12 +87,15 @@ const expected1 = 'Proxy [ {}, {} ]';
 const expected2 = 'Proxy [ Proxy [ {}, {} ], {} ]';
 const expected3 = 'Proxy [ Proxy [ Proxy [ {}, {} ], {} ], Proxy [ {}, {} ] ]';
 const expected4 = 'Proxy [ Proxy [ {}, {} ], Proxy [ Proxy [ {}, {} ], {} ] ]';
-const expected5 = 'Proxy [ Proxy [ Proxy [ Proxy [Array], {} ],' +
-                  ' Proxy [ {}, {} ] ],\n  Proxy [ Proxy [ {}, {} ]' +
-                  ', Proxy [ Proxy [Array], {} ] ] ]';
-const expected6 = 'Proxy [ Proxy [ Proxy [ Proxy [Array], Proxy [Array]' +
-                  ' ],\n    Proxy [ Proxy [Array], Proxy [Array] ] ],\n' +
-                  '  Proxy [ Proxy [ Proxy [Array], Proxy [Array] ],\n' +
+const expected5 = 'Proxy [\n  ' +
+                  'Proxy [ Proxy [ Proxy [Array], {} ], Proxy [ {}, {} ] ],\n' +
+                  '  Proxy [ Proxy [ {}, {} ], Proxy [ Proxy [Array], {} ] ] ]';
+const expected6 = 'Proxy [\n' +
+                  '  Proxy [\n' +
+                  '    Proxy [ Proxy [Array], Proxy [Array] ],\n' +
+                  '    Proxy [ Proxy [Array], Proxy [Array] ] ],\n' +
+                  '  Proxy [\n' +
+                  '    Proxy [ Proxy [Array], Proxy [Array] ],\n' +
                   '    Proxy [ Proxy [Array], Proxy [Array] ] ] ]';
 assert.strictEqual(
   util.inspect(proxy1, { showProxy: true, depth: null }),