Merge pull request #189 from FnControlOption/destructuring-to-new-variable-with-default-value

Fix destructuring assignment to new variable with default value

grammar.js

@@ -1119,7 +1119,7 @@ module.exports = grammar({
     pair_pattern: $ => seq(
       field('key', $._property_name),
       ':',
-      field('value', $.pattern)
+      field('value', choice($.pattern, $.assignment_pattern))
     ),
 
     _property_name: $ => choice(

src/grammar.json

@@ -6189,8 +6189,17 @@
           "type": "FIELD",
           "name": "value",
           "content": {
+            "type": "CHOICE",
+            "members": [
+              {
                 "type": "SYMBOL",
                 "name": "pattern"
+              },
+              {
+                "type": "SYMBOL",
+                "name": "assignment_pattern"
+              }
+            ]
           }
         }
       ]

src/node-types.json

@@ -2193,6 +2193,10 @@
         "multiple": false,
         "required": true,
         "types": [
+          {
+            "type": "assignment_pattern",
+            "named": true
+          },
           {
             "type": "pattern",
             "named": true

test/corpus/destructuring.txt

@@ -77,12 +77,25 @@ Array destructuring assignments
 Object destructuring patterns w/ default values
 ================================================
 
+let {a: b = c} = object;
+for await (var {a: {b} = object} of asyncIter) {}
 function a({b = true}, [c, d = false]) {}
 function b({c} = {}) {}
 
 ---
 
 (program
+  (lexical_declaration (variable_declarator
+    (object_pattern (pair_pattern
+      (property_identifier)
+      (assignment_pattern (identifier) (identifier))))
+    (identifier)))
+  (for_in_statement
+    (object_pattern (pair_pattern
+      (property_identifier)
+      (assignment_pattern (object_pattern (shorthand_property_identifier_pattern)) (identifier))))
+    (identifier)
+    (statement_block))
   (function_declaration (identifier)
     (formal_parameters
       (object_pattern (object_assignment_pattern (shorthand_property_identifier_pattern) (true)))