abort first sframe boot stage if eval is possible

www/common/sframe-boot.js

@@ -11,6 +11,25 @@ if (window === window.top) {
         window.alert(s);
     });
 }
+if (typeof(Promise) !== 'function') {
+    return void setTimeout(function () {
+        var s = "Internet Explorer is not supported anymore, including by Microsoft.\n\nMost of CryptPad's collaborative functionality requires a modern browser to work.\n\nWe recommend Mozilla Firefox.";
+        window.alert(s);
+    });
+}
+
+var caughtEval;
+try {
+    eval('true'); // jshint ignore:line
+} catch (err) { caughtEval = true; }
+
+if (!/^\/(sheet|doc|presentation)/.test(window.location.pathname) && !caughtEval) {
+    return void setTimeout(function () {
+        window.alert("aborting because eval should not be permitted.");
+    });
+}
+
+
 var afterLoaded = function (req) {
     req.cfg = req.cfg || {};
     if (req.pfx) {

www/common/sframe-boot2.js

@@ -43,22 +43,5 @@ define([
         throw e;
     };
 
-    if (typeof(Promise) !== 'function') {
-        return void setTimeout(function () {
-            var s = "Internet Explorer is not supported anymore, including by Microsoft.\n\nMost of CryptPad's collaborative functionality requires a modern browser to work.\n\nWe recommend Mozilla Firefox.";
-            window.alert(s);
-        });
-    }
-
-    var caughtEval;
-    try {
-        eval('true'); // jshint ignore:line
-    } catch (err) { caughtEval = true; }
-
-    if (!/^\/(sheet|doc|presentation)/.test(window.location.pathname) && !caughtEval) {
-        return void setTimeout(function () {
-            window.alert("aborting because eval should not be permitted.");
-        });
-    }
     require([document.querySelector('script[data-bootload]').getAttribute('data-bootload')]);
 });