Handle declare modifier for class fields

Fixes #797

TypeScript.YAML-tmLanguage

@@ -978,7 +978,7 @@ repository:
 
   access-modifier:
     name: storage.modifier.ts
-    match: '{{startOfIdentifier}}(abstract|public|protected|private|readonly|static){{endOfIdentifier}}'
+    match: '{{startOfIdentifier}}(abstract|public|protected|private|readonly|static|declare){{endOfIdentifier}}'
 
   property-accessor:
     name: storage.type.property.ts

TypeScript.tmLanguage

@@ -3115,7 +3115,7 @@
         <key>name</key>
         <string>storage.modifier.ts</string>
         <key>match</key>
-        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(abstract|public|protected|private|readonly|static)(?![_$[:alnum:]])(?:(?=\.\.\.)|(?!\.))</string>
+        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(abstract|public|protected|private|readonly|static|declare)(?![_$[:alnum:]])(?:(?=\.\.\.)|(?!\.))</string>
       </dict>
       <key>property-accessor</key>
       <dict>

TypeScriptReact.tmLanguage

@@ -3137,7 +3137,7 @@
         <key>name</key>
         <string>storage.modifier.tsx</string>
         <key>match</key>
-        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(abstract|public|protected|private|readonly|static)(?![_$[:alnum:]])(?:(?=\.\.\.)|(?!\.))</string>
+        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(abstract|public|protected|private|readonly|static|declare)(?![_$[:alnum:]])(?:(?=\.\.\.)|(?!\.))</string>
       </dict>
       <key>property-accessor</key>
       <dict>

tests/baselines/Issue797.baseline.txt

@@ -0,0 +1,40 @@
+original file
+-----------------------------------
+class Foo {
+    declare baz: any;
+}
+-----------------------------------
+
+Grammar: TypeScript.tmLanguage
+-----------------------------------
+>class Foo {
+ ^^^^^
+ source.ts meta.class.ts storage.type.class.ts
+      ^
+      source.ts meta.class.ts
+       ^^^
+       source.ts meta.class.ts entity.name.type.class.ts
+          ^
+          source.ts meta.class.ts
+           ^
+           source.ts meta.class.ts punctuation.definition.block.ts
+>    declare baz: any;
+ ^^^^
+ source.ts meta.class.ts
+     ^^^^^^^
+     source.ts meta.class.ts storage.modifier.ts
+            ^
+            source.ts meta.class.ts meta.field.declaration.ts
+             ^^^
+             source.ts meta.class.ts meta.field.declaration.ts meta.definition.property.ts variable.object.property.ts
+                ^
+                source.ts meta.class.ts meta.field.declaration.ts meta.type.annotation.ts keyword.operator.type.annotation.ts
+                 ^
+                 source.ts meta.class.ts meta.field.declaration.ts meta.type.annotation.ts
+                  ^^^
+                  source.ts meta.class.ts meta.field.declaration.ts meta.type.annotation.ts support.type.primitive.ts
+                     ^
+                     source.ts meta.class.ts punctuation.terminator.statement.ts
+>}
+ ^
+ source.ts meta.class.ts punctuation.definition.block.ts

tests/cases/Issue797.ts

@@ -0,0 +1,3 @@
+class Foo {
+    declare baz: any;
+}