Implement delete

Author: holzensp

grammar.js

@@ -249,7 +249,7 @@ module.exports = grammar({
         seq(
           optional($.typeAnnotation),
           "=",
-          $._expr
+          choice($._expr, $.delete),
         ),
         repeat1($.objectBody)
       )
@@ -262,7 +262,7 @@ module.exports = grammar({
       field("key", $._expr),
       "]",
       choice(
-        seq("=", field("valueExpr", $._expr)),
+        seq("=", choice(field("valueExpr", $._expr), $.delete)),
         repeat1($.objectBody)
       )
     ),
@@ -274,7 +274,7 @@ module.exports = grammar({
       field("conditionExpr", $._expr),
       "]]",
       choice(
-        seq("=", field("valueExpr", $._expr)),
+        seq("=", choice(field("valueExpr", $._expr), $.delete)),
         repeat1($.objectBody)
       )
     ),
@@ -397,6 +397,8 @@ module.exports = grammar({
       $._expr2
     ),
 
+    delete: $ => "delete",
+
     variableObjectLiteral: $ => prec(PREC.VAR_OBJ_LITERAL, seq(
       $.identifier,
       $.objectBody

src/grammar.json

@@ -758,8 +758,17 @@
                   "value": "="
                 },
                 {
-                  "type": "SYMBOL",
-                  "name": "_expr"
+                  "type": "CHOICE",
+                  "members": [
+                    {
+                      "type": "SYMBOL",
+                      "name": "_expr"
+                    },
+                    {
+                      "type": "SYMBOL",
+                      "name": "delete"
+                    }
+                  ]
                 }
               ]
             },
@@ -821,12 +830,21 @@
                   "value": "="
                 },
                 {
-                  "type": "FIELD",
-                  "name": "valueExpr",
-                  "content": {
-                    "type": "SYMBOL",
-                    "name": "_expr"
-                  }
+                  "type": "CHOICE",
+                  "members": [
+                    {
+                      "type": "FIELD",
+                      "name": "valueExpr",
+                      "content": {
+                        "type": "SYMBOL",
+                        "name": "_expr"
+                      }
+                    },
+                    {
+                      "type": "SYMBOL",
+                      "name": "delete"
+                    }
+                  ]
                 }
               ]
             },
@@ -884,12 +902,21 @@
                   "value": "="
                 },
                 {
-                  "type": "FIELD",
-                  "name": "valueExpr",
-                  "content": {
-                    "type": "SYMBOL",
-                    "name": "_expr"
-                  }
+                  "type": "CHOICE",
+                  "members": [
+                    {
+                      "type": "FIELD",
+                      "name": "valueExpr",
+                      "content": {
+                        "type": "SYMBOL",
+                        "name": "_expr"
+                      }
+                    },
+                    {
+                      "type": "SYMBOL",
+                      "name": "delete"
+                    }
+                  ]
                 }
               ]
             },
@@ -1599,6 +1626,10 @@
         }
       ]
     },
+    "delete": {
+      "type": "STRING",
+      "value": "delete"
+    },
     "variableObjectLiteral": {
       "type": "PREC",
       "value": 2,

src/node-types.json

@@ -2985,6 +2985,10 @@
       "multiple": true,
       "required": false,
       "types": [
+        {
+          "type": "delete",
+          "named": true
+        },
         {
           "type": "objectBody",
           "named": true
@@ -3563,6 +3567,10 @@
       "multiple": true,
       "required": false,
       "types": [
+        {
+          "type": "delete",
+          "named": true
+        },
         {
           "type": "objectBody",
           "named": true
@@ -3590,6 +3598,10 @@
           "type": "binaryExprRightAssoc",
           "named": true
         },
+        {
+          "type": "delete",
+          "named": true
+        },
         {
           "type": "falseLiteral",
           "named": true
@@ -6132,6 +6144,10 @@
     "type": "const",
     "named": false
   },
+  {
+    "type": "delete",
+    "named": true
+  },
   {
     "type": "else",
     "named": false