diff --git a/mode/javascript/javascript.js b/mode/javascript/javascript.js
index 122c1845f1..46ac459d5b 100644
--- a/mode/javascript/javascript.js
+++ b/mode/javascript/javascript.js
@@ -622,6 +622,7 @@ CodeMirror.defineMode("javascript", function(config, parserConfig) {
     if (type == "{") return cont(pushlex("}"), typeprops, poplex, afterType)
     if (type == "(") return cont(commasep(typearg, ")"), maybeReturnType, afterType)
     if (type == "<") return cont(commasep(typeexpr, ">"), typeexpr)
+    if (type == "quasi") { return pass(quasiType, afterType); }
   }
   function maybeReturnType(type) {
     if (type == "=>") return cont(typeexpr)
@@ -647,6 +648,18 @@ CodeMirror.defineMode("javascript", function(config, parserConfig) {
       return cont()
     }
   }
+  function quasiType(type, value) {
+    if (type != "quasi") return pass();
+    if (value.slice(value.length - 2) != "${") return cont(quasiType);
+    return cont(typeexpr, continueQuasiType);
+  }
+  function continueQuasiType(type) {
+    if (type == "}") {
+      cx.marked = "string-2";
+      cx.state.tokenize = tokenQuasi;
+      return cont(quasiType);
+    }
+  }
   function typearg(type, value) {
     if (type == "variable" && cx.stream.match(/^\s*[?:]/, false) || value == "?") return cont(typearg)
     if (type == ":") return cont(typeexpr)