Peer dep (#153)

* make an inline plugin for the preflight check, make babel-core a peerDep

* turn babel-core dep into a peerDep

* fix reference to old class plugin

packages/rollup-plugin-babel/package.json

@@ -31,11 +31,13 @@
     "lint": "eslint src"
   },
   "dependencies": {
-    "babel-core": "7.0.0-alpha.17",
-    "babel-plugin-transform-es2015-classes": "7.0.0-alpha.17",
     "rollup-pluginutils": "^1.5.0"
   },
+  "peerDependencies": {
+    "babel-core": "6 || 7 || ^7.0.0-alpha || ^7.0.0-beta || ^7.0.0-rc"
+  },
   "devDependencies": {
+    "babel-core": "7.0.0-alpha.17",
     "babel-plugin-external-helpers": "7.0.0-alpha.17",
     "babel-plugin-transform-decorators": "7.0.0-alpha.17",
     "babel-plugin-transform-runtime": "7.0.0-alpha.17",

packages/rollup-plugin-babel/src/helperPlugin.js

@@ -0,0 +1,9 @@
+export default function importHelperPlugin () {
+	return {
+		visitor: {
+			Program (path, state) {
+				state.file.addHelper('classCallCheck');
+			}
+		}
+	};
+}

packages/rollup-plugin-babel/src/preflightCheck.js

@@ -1,7 +1,7 @@
 import { join } from 'path';
 import { transform } from 'babel-core';
 import { INLINE, RUNTIME, BUNDLED } from './constants.js';
-import classes from 'babel-plugin-transform-es2015-classes';
+import importHelperPlugin from './helperPlugin.js';
 
 let preflightCheckResults = {};
 
@@ -15,7 +15,7 @@ export default function preflightCheck ( options, dir ) {
 
 		options.filename = join( dir, 'x.js' );
 
-		options.plugins = options.plugins ? options.plugins.concat( classes ) : [ classes ];
+		options.plugins = options.plugins ? options.plugins.concat( importHelperPlugin ) : [ importHelperPlugin ];
 
 		const check = transform( 'export default class Foo {}', options ).code;
 

packages/rollup-plugin-babel/test/helperPlugin.js

@@ -0,0 +1,9 @@
+module.exports = function importHelperPlugin () {
+  return {
+    visitor: {
+      Program (path, state) {
+        state.file.addHelper('classCallCheck');
+      }
+    }
+  };
+}

packages/rollup-plugin-babel/test/samples/duplicated-helpers-warning/.babelrc

@@ -1,3 +1,3 @@
 {
-	"plugins": [ "transform-es2015-classes" ]
+	"plugins": [ "../../helperPlugin" ]
 }