repl: improve static import error message in repl

Currently the error is rather ambiguous and does not inform folks that static import is not supported in the repl. This overrides the default error message with one that is more informative. Closes: #33576 PR-URL: #33588 Fixes: #33576 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]>
nodejs · Nov 16, 2020 · 18f01dd · 18f01dd
1 parent 77555d8
commit 18f01dd
Show file tree

Hide file tree

Showing 2 changed files with 19 additions and 0 deletions.
diff --git a/lib/repl.js b/lib/repl.js
@@ -58,6 +58,7 @@ const {
   PromiseRace,
   RegExp,
   Set,
+  StringPrototypeIncludes,
   Symbol,
   WeakSet,
 } = primordials;
@@ -549,6 +550,14 @@ function REPLServer(prompt,
             e.stack = e.stack
               .replace(/^REPL\d+:\d+\r?\n/, '')
               .replace(/^\s+at\s.*\n?/gm, '');
+            const importErrorStr = 'Cannot use import statement outside a ' +
+              'module';
+            if (StringPrototypeIncludes(e.message, importErrorStr)) {
+              e.message = 'Cannot use import statement inside the Node.js ' +
+                'repl, alternatively use dynamic import';
+              e.stack = e.stack.replace(/SyntaxError:.*\n/,
+                                        `SyntaxError: ${e.message}\n`);
+            }
           } else if (self.replMode === exports.REPL_MODE_STRICT) {
             e.stack = e.stack.replace(/(\s+at\s+REPL\d+:)(\d+)/,
                                       (_, pre, line) => pre + (line - 1));

diff --git a/test/parallel/test-repl.js b/test/parallel/test-repl.js
@@ -805,6 +805,16 @@ const tcpTests = [
   {
     send: `require(${JSON.stringify(moduleFilename)}).number`,
     expect: '42'
+  },
+  {
+    send: 'import comeOn from \'fhqwhgads\'',
+    expect: [
+      kSource,
+      kArrow,
+      '',
+      'Uncaught:',
+      /^SyntaxError: .* dynamic import/
+    ]
   }
 ];