feat: add await to reserved identifiers

Co-authored-by: FnControlOption
<[email protected]>

Author: amaanq

grammar.js

@@ -132,8 +132,10 @@ module.exports = grammar({
 
   conflicts: $ => [
     [$.primary_expression, $._property_name],
-    [$.primary_expression, $._property_name, $.arrow_function],
+    [$.primary_expression, $.await_expression],
+    [$.primary_expression, $.await_expression, $._property_name],
     [$.primary_expression, $.arrow_function],
+    [$.primary_expression, $.arrow_function, $._property_name],
     [$.primary_expression, $.method_definition],
     [$.primary_expression, $.rest_pattern],
     [$.primary_expression, $.pattern],
@@ -1289,6 +1291,7 @@ module.exports = grammar({
       'get',
       'set',
       'async',
+      'await',
       'static',
       'export',
       'let',

test/corpus/expressions.txt

@@ -158,6 +158,7 @@ arr[0]`hello`;
 f`hello``goodbye`;
 
 ---
+
 (program
   (expression_statement
     (call_expression
@@ -530,6 +531,7 @@ Objects with reserved words for keys
   set: function () {},
   static: true,
   async: true,
+  await: true,
 };
 
 ---
@@ -558,6 +560,9 @@ Objects with reserved words for keys
       (pair
         (property_identifier)
         (true))
+      (pair
+        (property_identifier)
+        (true))
       (pair
         (property_identifier)
         (true)))))
@@ -698,6 +703,7 @@ Classes with reserved words as methods
 class Foo {
   catch() {}
   finally() {}
+  await() {}
 }
 
 ---
@@ -710,6 +716,10 @@ class Foo {
         (property_identifier)
         (formal_parameters)
         (statement_block))
+      (method_definition
+        (property_identifier)
+        (formal_parameters)
+        (statement_block))
       (method_definition
         (property_identifier)
         (formal_parameters)
@@ -2169,6 +2179,30 @@ yield db.users.where('[endpoint+email]')
           (string
             (string_fragment)))))))
 
+============================================
+Reserved words as identifiers
+============================================
+
+function await(await) { await: await (await + await (0)); }
+
+---
+
+(program
+  (function_declaration
+    (identifier)
+    (formal_parameters (identifier))
+    (statement_block
+      (labeled_statement
+        (statement_identifier)
+        (expression_statement
+          (await_expression
+            (parenthesized_expression
+              (await_expression
+                (unary_expression
+                  (await_expression
+                    (parenthesized_expression
+                      (number))))))))))))
+
 ============================================
 JSX
 ============================================