Fix #4774: `export default` followed by an object should always work, even if the object contains braces. `default` shouldn't suppress a newline, we should handle it in the grammar the same way returning an implicit object is handled (#4783)

lib/coffeescript/grammar.js

@@ -822,6 +822,10 @@
       function() {
         return new ExportDefaultDeclaration($3);
       }),
+      o('EXPORT DEFAULT INDENT Object OUTDENT',
+      function() {
+        return new ExportDefaultDeclaration(new Value($4));
+      }),
       o('EXPORT EXPORT_ALL FROM String',
       function() {
         return new ExportAllDeclaration(new Literal($2),

lib/coffeescript/lexer.js

@@ -1685,6 +1685,6 @@
   INDENTABLE_CLOSERS = [')', '}', ']'];
 
   // Tokens that, when appearing at the end of a line, suppress a following TERMINATOR/INDENT token
-  UNFINISHED = ['\\', '.', '?.', '?::', 'UNARY', 'MATH', 'UNARY_MATH', '+', '-', '**', 'SHIFT', 'RELATION', 'COMPARE', '&', '^', '|', '&&', '||', 'BIN?', 'EXTENDS', 'DEFAULT'];
+  UNFINISHED = ['\\', '.', '?.', '?::', 'UNARY', 'MATH', 'UNARY_MATH', '+', '-', '**', 'SHIFT', 'RELATION', 'COMPARE', '&', '^', '|', '&&', '||', 'BIN?', 'EXTENDS'];
 
 }).call(this);

src/grammar.coffee

@@ -439,6 +439,7 @@ grammar =
     o 'EXPORT Identifier = INDENT Expression OUTDENT',       -> new ExportNamedDeclaration new Assign $2, $5, null,
                                                                                                       moduleDeclaration: 'export'
     o 'EXPORT DEFAULT Expression',                           -> new ExportDefaultDeclaration $3
+    o 'EXPORT DEFAULT INDENT Object OUTDENT',                -> new ExportDefaultDeclaration new Value $4
     o 'EXPORT EXPORT_ALL FROM String',                       -> new ExportAllDeclaration new Literal($2), $4
     o 'EXPORT { ExportSpecifierList OptComma } FROM String', -> new ExportNamedDeclaration new ExportSpecifierList($3), $7
   ]

src/lexer.coffee

@@ -1354,4 +1354,4 @@ INDENTABLE_CLOSERS = [')', '}', ']']
 # Tokens that, when appearing at the end of a line, suppress a following TERMINATOR/INDENT token
 UNFINISHED = ['\\', '.', '?.', '?::', 'UNARY', 'MATH', 'UNARY_MATH', '+', '-',
            '**', 'SHIFT', 'RELATION', 'COMPARE', '&', '^', '|', '&&', '||',
-           'BIN?', 'EXTENDS', 'DEFAULT']
+           'BIN?', 'EXTENDS']

test/modules.coffee

@@ -329,7 +329,7 @@ test "export default implicit object", ->
 test "export default multiline implicit object", ->
   eqJS """
     export default
-      foo: 'bar',
+      foo: 'bar'
       baz: 'qux'
     """,
   """
@@ -338,6 +338,22 @@ test "export default multiline implicit object", ->
       baz: 'qux'
     };"""
 
+test "export default multiline implicit object with internal braces", ->
+  eqJS """
+    export default
+      foo: yes
+      bar: {
+        baz
+      }
+      quz: no
+    """,
+  """
+    export default {
+      foo: true,
+      bar: {baz},
+      quz: false
+    };"""
+
 test "export default assignment expression", ->
   eqJS "export default foo = 'bar'",
   """