[javascript mode] Highlight type in generic call

Closes codemirror#5048.

Author: adrianheine

mode/javascript/javascript.js

@@ -438,6 +438,7 @@ CodeMirror.defineMode("javascript", function(config, parserConfig) {
     if (type == "=>") return cont(pushcontext, noComma ? arrowBodyNoComma : arrowBody, popcontext);
     if (type == "operator") {
       if (/\+\+|--/.test(value) || isTS && value == "!") return cont(me);
+      if (isTS && value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, maybeoperatorNoComma);
       if (value == "?") return cont(expression, expect(":"), expr);
       return cont(expr);
     }

mode/javascript/test.js

@@ -371,6 +371,9 @@
   TS("arrow prop",
      "({[property a]: [def p] [operator =>] [variable-2 p]})")
 
+  TS("generic in function call",
+     "[keyword this].[property a][operator <][type Type][operator >]([variable foo]);")
+
   var jsonld_mode = CodeMirror.getMode(
     {indentUnit: 2},
     {name: "javascript", jsonld: true}