language injection

grammar.js

@@ -126,7 +126,7 @@ module.exports = grammar({
         // optional doesn't seem to help, so we have an error at void
         optional(seq("where", optional(layout($, $.sigDecl)))),
       ),
-    jsLitString: $ => /`[^`]+`/,
+    jsLitString: $ => seq("`",alias(/[^`]+/,$.jsStringFragment),"`"),
     deriveDecl: $ => seq("derive", repeat1($.identifier)),
     pfuncDecl: ($) => seq(
       "pfunc",

src/grammar.json

@@ -1062,8 +1062,26 @@
       ]
     },
     "jsLitString": {
-      "type": "PATTERN",
-      "value": "`[^`]+`"
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "`"
+        },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "PATTERN",
+            "value": "[^`]+"
+          },
+          "named": true,
+          "value": "jsStringFragment"
+        },
+        {
+          "type": "STRING",
+          "value": "`"
+        }
+      ]
     },
     "deriveDecl": {
       "type": "SEQ",

src/node-types.json

@@ -375,6 +375,21 @@
       ]
     }
   },
+  {
+    "type": "jsLitString",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "jsStringFragment",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "lamExpr",
     "named": true,
@@ -841,6 +856,10 @@
     "type": "]",
     "named": false
   },
+  {
+    "type": "`",
+    "named": false
+  },
   {
     "type": "character",
     "named": true
@@ -907,7 +926,7 @@
     "named": false
   },
   {
-    "type": "jsLitString",
+    "type": "jsStringFragment",
     "named": true
   },
   {