repl: eager-evaluate input in parens

PR-URL: #31943
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: codebytere

lib/repl.js

@@ -322,12 +322,12 @@ function REPLServer(prompt,
     let awaitPromise = false;
     const input = code;
 
-    if (/^\s*{/.test(code) && /}\s*$/.test(code)) {
-      // It's confusing for `{ a : 1 }` to be interpreted as a block
-      // statement rather than an object literal.  So, we first try
-      // to wrap it in parentheses, so that it will be interpreted as
-      // an expression.  Note that if the above condition changes,
-      // lib/internal/repl/utils.js needs to be changed to match.
+    // It's confusing for `{ a : 1 }` to be interpreted as a block
+    // statement rather than an object literal.  So, we first try
+    // to wrap it in parentheses, so that it will be interpreted as
+    // an expression.  Note that if the above condition changes,
+    // lib/internal/repl/utils.js needs to be changed to match.
+    if (/^\s*{/.test(code) && !/;\s*$/.test(code)) {
       code = `(${code.trim()})\n`;
       wrappedCmd = true;
     }

test/parallel/test-repl-preview.js

@@ -88,6 +88,23 @@ async function tests(options) {
      '\x1B[36m[Function: koo]\x1B[39m',
      '\x1B[1G\x1B[0Jrepl > \x1B[8G'],
     ['a', [1, 2], undefined],
+    [" { b: 1 }['b'] === 1", [2, 6], '\x1B[33mtrue\x1B[39m',
+     " { b: 1 }['b']",
+     '\x1B[90m1\x1B[39m\x1B[22G\x1B[1A\x1B[1B\x1B[2K\x1B[1A ',
+     '\x1B[90m1\x1B[39m\x1B[23G\x1B[1A\x1B[1B\x1B[2K\x1B[1A=== 1',
+     '\x1B[90mtrue\x1B[39m\x1B[28G\x1B[1A\x1B[1B\x1B[2K\x1B[1A\r',
+     '\x1B[33mtrue\x1B[39m',
+     '\x1B[1G\x1B[0Jrepl > \x1B[8G'
+    ],
+    ["{ b: 1 }['b'] === 1;", [2, 7], '\x1B[33mfalse\x1B[39m',
+     "{ b: 1 }['b']",
+     '\x1B[90m1\x1B[39m\x1B[21G\x1B[1A\x1B[1B\x1B[2K\x1B[1A ',
+     '\x1B[90m1\x1B[39m\x1B[22G\x1B[1A\x1B[1B\x1B[2K\x1B[1A=== 1',
+     '\x1B[90mtrue\x1B[39m\x1B[27G\x1B[1A\x1B[1B\x1B[2K\x1B[1A;',
+     '\x1B[90mfalse\x1B[39m\x1B[28G\x1B[1A\x1B[1B\x1B[2K\x1B[1A\r',
+     '\x1B[33mfalse\x1B[39m',
+     '\x1B[1G\x1B[0Jrepl > \x1B[8G'
+    ],
     ['{ a: true }', [2, 3], '{ a: \x1B[33mtrue\x1B[39m }',
      '{ a: tru\x1B[90me\x1B[39m\x1B[16G\x1B[0Ke }\r',
      '{ a: \x1B[33mtrue\x1B[39m }',