add classlist check for IE11 and update deps

package.json

@@ -1,6 +1,6 @@
 {
   "name": "popostmate",
-  "version": "1.6.3",
+  "version": "1.6.4",
   "description": "A powerful, simple, promise-based postMessage library",
   "main": "build/postmate.js",
   "module": "build/postmate.es.js",
@@ -10,36 +10,36 @@
     "src"
   ],
   "devDependencies": {
-    "@babel/core": "^7.0.0-beta.51",
-    "@babel/plugin-proposal-class-properties": "^7.0.0-beta.51",
-    "@babel/preset-env": "^7.0.0-beta.51",
-    "babel-core": "^7.0.0-bridge.0",
-    "babel-jest": "^23.0.0",
-    "chai": "^4.1.2",
-    "codecov": "^3.0.2",
-    "connect": "^3.4.1",
-    "conventional-changelog-cli": "^2.0.5",
-    "es-check": "^5.0.0",
-    "eslint": "^6.0.0",
+    "@babel/core": "^7.12.3",
+    "@babel/plugin-proposal-class-properties": "^7.12.1",
+    "@babel/preset-env": "^7.12.1",
+    "babel-core": "^7.0.0-bridge",
+    "babel-jest": "^26.6.1",
+    "chai": "^4.2.0",
+    "codecov": "^3.8.0",
+    "connect": "^3.7.0",
+    "conventional-changelog-cli": "^2.1.0",
+    "es-check": "^5.1.2",
+    "eslint": "^7.12.1",
     "eslint-config-dollarshaveclub": "^3.0.4",
-    "eslint-plugin-import": "^2.18.2",
-    "eslint-plugin-node": "^11.0.0",
-    "eslint-plugin-standard": "^4.0.1",
-    "gulp": "4.0.2",
-    "gulp-mocha-phantomjs": "0.12.2",
-    "gzip-size": "^5.0.0",
-    "jest": "^22.0.0",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-standard": "^4.0.2",
+    "gulp": "^4.0.2",
+    "gulp-mocha-phantomjs": "^0.12.2",
+    "gzip-size": "^5.1.1",
+    "jest": "^26.6.1",
     "mocha": "^7.0.1",
     "mocha-phantomjs": "^4.1.0",
-    "nyc": "^15.0.0",
-    "regenerator-runtime": "^0.13.0",
-    "rollup": "^1.21.4",
-    "rollup-plugin-babel": "^4.0.0-beta.0",
-    "rollup-plugin-replace": "^2.0.0",
-    "rollup-plugin-uglify": "^6.0.0",
-    "rsvp": "^4.8.1",
-    "serve-static": "^1.11.1",
-    "uglify-js": "^3.6.3",
+    "nyc": "^15.1.0",
+    "regenerator-runtime": "^0.13.7",
+    "rollup": "^2.32.1",
+    "rollup-plugin-babel": "^4.4.0",
+    "rollup-plugin-replace": "^2.2.0",
+    "rollup-plugin-uglify": "^6.0.4",
+    "rsvp": "^4.8.5",
+    "serve-static": "^1.14.1",
+    "uglify-js": "^3.11.4",
     "vinyl-source-stream": "^2.0.0"
   },
   "scripts": {
@@ -48,7 +48,7 @@
     "test": "npm run test:unit && npm run test:acceptance && npm run test:es-check",
     "test:es-check": "es-check es5 build/postmate.min.js",
     "test:unit": "jest --coverage",
-    "test:acceptance": "gulp test ",
+    "test:acceptance": "gulp test",
     "build": "npm run build:dist && npm run build:readme",
     "build:readme": "node ./scripts/update-readme.js",
     "build:dist": "rollup --config configs/rollup.config.js",

src/postmate.js

@@ -288,7 +288,9 @@ class Postmate {
     this.parent = window
     this.frame = document.createElement('iframe')
     this.frame.name = name || ''
-    this.frame.classList.add.apply(this.frame.classList, classListArray)
+    if (classListArray.length > 0) { // check for IE 11. See issue#207
+      this.frame.classList.add.apply(this.frame.classList, classListArray)
+    }
     container.appendChild(this.frame)
     this.child = this.frame.contentWindow || this.frame.contentDocument.parentWindow
     this.model = model || {}

test/acceptance/fixtures/child.html

@@ -14,7 +14,7 @@
     <script>
       window.onerror = function () { console.log.apply(console, arguments); };
     </script>
-    <script src="../../node_modules/rsvp/dist/rsvp.min.js"></script>
+    <script src="../../node_modules/rsvp/dist/rsvp.js"></script>
     <script type="text/javascript" src="../../build/postmate.min.js"></script>
     <script>Postmate.Promise = RSVP.Promise;</script>
     <script type="text/javascript">

test/acceptance/runner.html

@@ -10,7 +10,7 @@
         <script src="../../node_modules/mocha/mocha.js"></script>
         <script src="../../node_modules/chai/chai.js"></script>
         <script>mocha.setup('bdd')</script>
-        <script src="../../node_modules/rsvp/dist/rsvp.min.js"></script>
+        <script src="../../node_modules/rsvp/dist/rsvp.js"></script>
         <script src="../../build/postmate.dev.js"></script>
         <script>Postmate.Promise = RSVP.Promise;</script>
         <script src="./test.js"></script>