WIP add heredoc templates; only EOF marker at the moment

src/node-types.json

@@ -426,6 +426,42 @@
       ]
     }
   },
+  {
+    "type": "heredoc_start",
+    "named": true,
+    "fields": {}
+  },
+  {
+    "type": "heredoc_template",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "heredoc_identifier",
+          "named": true
+        },
+        {
+          "type": "heredoc_start",
+          "named": true
+        },
+        {
+          "type": "template_directive",
+          "named": true
+        },
+        {
+          "type": "template_interpolation",
+          "named": true
+        },
+        {
+          "type": "template_literal",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "index",
     "named": true,
@@ -616,6 +652,10 @@
       "multiple": false,
       "required": true,
       "types": [
+        {
+          "type": "heredoc_template",
+          "named": true
+        },
         {
           "type": "quoted_template",
           "named": true
@@ -792,6 +832,14 @@
     "type": "<",
     "named": false
   },
+  {
+    "type": "<<",
+    "named": false
+  },
+  {
+    "type": "<<-",
+    "named": false
+  },
   {
     "type": "<=",
     "named": false
@@ -848,6 +896,10 @@
     "type": "for",
     "named": false
   },
+  {
+    "type": "heredoc_identifier",
+    "named": true
+  },
   {
     "type": "identifier",
     "named": true