Fix #4451: Treat default as a keyword in an export statement only w…

…hen it follows `export` or `as`
jashkenas · Apr 3, 2017 · 98d1644 · 98d1644
1 parent ca0fd22
commit 98d1644
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Showing 3 changed files with 15 additions and 7 deletions.
diff --git a/lib/coffee-script/lexer.js b/lib/coffee-script/lexer.js
diff --git a/src/lexer.coffee b/src/lexer.coffee
@@ -127,7 +127,7 @@ exports.Lexer = class Lexer
     if id is 'as' and @seenExport and @tag() is 'IDENTIFIER'
       @token 'AS', id
       return id.length
-    if id is 'default' and @seenExport
+    if id is 'default' and @seenExport and @tag() in ['EXPORT', 'AS']
       @token 'DEFAULT', id
       return id.length
 

diff --git a/test/modules.coffee b/test/modules.coffee
@@ -749,3 +749,11 @@ test "#4394: export shouldn't prevent variable declarations", ->
     };
   """
   eq toJS(input), output
+
+test "#4451: `default` in an export statement is only treated as a keyword when it follows `export` or `as`", ->
+  input = "export default { default: 1 }"
+  output = """
+    export default {
+      "default": 1
+    };
+  """