util: allow single-line format when break length is infinite

Signed-off-by: Hamid Reza Ghavami <hamidr.ghavami@gmail.com>
PR-URL: #64238
Reviewed-By: Jordan Harband <ljharb@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>

Author: hamidrezaghavami

lib/internal/util/inspect.js

@@ -2622,6 +2622,14 @@ function isBelowBreakLength(ctx, output, start, base) {
   // TODO(BridgeAR): Add unicode support. Use the readline getStringWidth
   // function. Check the performance overhead and make it an opt-in in case it's
   // significant.
+  // allow the single-line format if the length limit is infinite and no items have newlines
+  if (ctx.breakLength === Infinity) {
+    if (base !== '' && StringPrototypeIncludes(base, '\n')) return false;
+    for (let i = 0; i < output.length; i++) {
+      if (typeof output[i] === 'string' && StringPrototypeIncludes(output[i], '\n')) return false;
+    }
+    return true;
+  }
   let totalLength = output.length + start;
   if (totalLength + output.length > ctx.breakLength)
     return false;

test/parallel/test-util-inspect.js

@@ -4064,3 +4064,9 @@ ${error.stack.split('\n').slice(1).join('\n')}`,
   assert.match(inspect(DOMException.prototype), /^\[object DOMException\] \{/);
   delete Error[Symbol.hasInstance];
 }
+
+{
+  const obj = { a: 'short string', b: [1, 2], c: { d: true } };
+  const expected = "{ a: 'short string', b: [ 1, 2 ], c: { d: true } }";
+  assert.strictEqual(util.inspect(obj, { breakLength: Infinity }), expected);
+}