test: add open bracket case

lib/internal/repl/utils.js

@@ -769,44 +769,52 @@ const endsWithSemicolonRegExp = /;\s*$/;
 function isObjectLiteral(code) {
   return RegExpPrototypeExec(startsWithBraceRegExp, code) !== null &&
     RegExpPrototypeExec(endsWithSemicolonRegExp, code) === null;
-}
+  function isValidSyntax(input) {
+    const Parser = require('internal/deps/acorn/acorn/dist/acorn').Parser;
+    try {
+      Parser.parse(input, { ecmaVersion: 'latest' });
+      return true;
+    } catch {
+      return false;
+    }
+  }
 
-function isValidParentheses(input) {
-  const stack = [];
-  const pairs = {
-    '(': ')',
-    '[': ']',
-    '{': '}',
-  };
+  function isValidParentheses(input) {
+    const stack = [];
+    const pairs = {
+      '(': ')',
+      '[': ']',
+      '{': '}',
+    };
 
-  for (let i = 0; i < input.length; i++) {
-    const char = input[i];
+    for (let i = 0; i < input.length; i++) {
+      const char = input[i];
 
-    if (pairs[char]) {
-      stack.push(char);
-    } else if (char === ')' || char === ']' || char === '}') {
-      if (pairs[stack.pop()] !== char) {
-        return false;
+      if (pairs[char]) {
+        stack.push(char);
+      } else if (char === ')' || char === ']' || char === '}') {
+        if (pairs[stack.pop()] !== char) {
+          return false;
+        }
       }
-    }
-    function isValidSyntax(input) {
-      const Parser = require('internal/deps/acorn/acorn/dist/acorn').Parser;
-      try {
-        let result = Parser.parse(input, { ecmaVersion: 'latest' });
-        return true;
-      } catch (e) {
-        return false;
+      function isValidSyntax(input) {
+        const Parser = require('internal/deps/acorn/acorn/dist/acorn').Parser;
+        try {
+          let result = Parser.parse(input, { ecmaVersion: 'latest' });
+          return true;
+        } catch (e) {
+          return false;
+        }
       }
-    }
 
-    module.exports = {
-      REPL_MODE_SLOPPY: Symbol('repl-sloppy'),
-      REPL_MODE_STRICT,
-      isRecoverableError,
-      kStandaloneREPL: Symbol('kStandaloneREPL'),
-      setupPreview,
-      setupReverseSearch,
-      isObjectLiteral,
-      isValidParentheses,
-      isValidSyntax,
-    };
+      module.exports = {
+        REPL_MODE_SLOPPY: Symbol('repl-sloppy'),
+        REPL_MODE_STRICT,
+        isRecoverableError,
+        kStandaloneREPL: Symbol('kStandaloneREPL'),
+        setupPreview,
+        setupReverseSearch,
+        isObjectLiteral,
+        isValidParentheses,
+        isValidSyntax,
+      };

test/parallel/test-repl-preview.js

@@ -184,6 +184,13 @@ async function tests(options) {
       '',
       "Uncaught SyntaxError: Unexpected token ')'",
     ],
+  }, {
+    input: "{ a: '{' }",
+    noPreview: "{ a: \x1B[32m'{'\x1B[39m }",
+    preview: [
+      "{ a: '{' }\r",
+      "{ a: \x1B[32m'{'\x1B[39m }",
+    ],
   }];
 
   const hasPreview = repl.terminal &&