upgrade babel, fix rollup helpers problem

README.md

@@ -16,6 +16,8 @@ OR
 
 Sequins does not yet support being included outside of a module system.
 
+**IMPORTANT NOTE**: Sequins depends on a working implementation of Map and Set. If you need to support browsers which lack some or all of the implementation, it is your responsibility to setup `core-js`.
+
 ## Status
 
 This project is in alpha. It is not ready for production usage and should be expected to contain (many) omissions and bugs.

package.json

@@ -14,16 +14,15 @@
     "test": "jest"
   },
   "devDependencies": {
-    "@babel/core": "^7.0.0-beta.56",
-    "@babel/plugin-external-helpers": "^7.0.0-rc.3",
-    "@babel/plugin-transform-classes": "^7.0.0-beta.56",
+    "@babel/core": "^7.0.0",
+    "@babel/plugin-external-helpers": "^7.0.0",
+    "@babel/plugin-transform-classes": "^7.0.0",
     "@babel/plugin-transform-modules-commonjs": "^7.0.0",
     "@babel/plugin-transform-runtime": "^7.0.0",
-    "@babel/preset-env": "7.0.0-beta.56",
-    "babel-core": "^7.0.0-beta.41",
+    "@babel/preset-env": "7.0.0",
     "babel-jest": "^23.4.2",
     "broccoli": "^2.0.0-beta.4",
-    "broccoli-babel-transpiler": "7.0.0-beta.4",
+    "broccoli-babel-transpiler": "^7.0.0",
     "broccoli-cli": "^1.0.0",
     "broccoli-merge-trees": "^3.0.1",
     "broccoli-rollup": "^2.1.1",

rollup.config.js

@@ -8,7 +8,7 @@ module.exports = {
     file: 'dist/sequins.mjs',
     format: 'es',
   },
-  external: ['iter-tools', 'invariant', 'stable', '@babel/runtime/regenerator'],
+  external: module => /^(iter-tools|invariant|stable|@babel\/runtime)\b/.test(module),
   plugins: [
     resolve({
       extensions: ['.mjs', '.js', '.json'],