Upgrade to Babel 7 and @babel scoped packages (#255)

* Support Babel 7

* Update browserify-cli.js

* Remove Babel 6 from peer dependencies

* Do not call callback if error occured

* Change error case to calling super() w/o a superclass

* Update package-lock.json

* update readme [skip ci]

* revert small change [skip ci]

README.md

@@ -7,6 +7,10 @@ As of [Babel 6.0.0](http://babeljs.io/blog/2015/10/29/6.0.0/) there are **no plu
 ## Installation
 
 ```sh
+# Babel 7
+$ npm install --save-dev babelify@next @babel/core
+
+# Babel 6
 $ npm install --save-dev babelify babel-core
 ```
 
@@ -15,7 +19,7 @@ $ npm install --save-dev babelify babel-core
 ### CLI
 
 ```sh
-  $ browserify script.js -o bundle.js -t [ babelify --presets [ env react ] ]
+  $ browserify script.js -o bundle.js -t [ babelify --presets [ "@babel/preset-env", "@babel/preset-react" ] ]
 ```
 
 ### Node
@@ -24,15 +28,15 @@ $ npm install --save-dev babelify babel-core
 var fs = require("fs");
 var browserify = require("browserify");
 browserify("./script.js")
-  .transform("babelify", {presets: ["env", "react"]})
+  .transform("babelify", {presets: ["@babel/preset-env", "@babel/preset-react"]})
   .bundle()
   .pipe(fs.createWriteStream("bundle.js"));
 ```
 
-**NOTE:** [Presets and plugins](http://babeljs.io/docs/plugins/) need to be installed as separate modules. For the above examples to work, you'd need to also install [`babel-preset-env`](https://www.npmjs.com/package/babel-preset-env) and [`babel-preset-react`](https://www.npmjs.com/package/babel-preset-react):
+**NOTE:** [Presets and plugins](http://babeljs.io/docs/plugins/) need to be installed as separate modules. For the above examples to work, you'd need to also install [`@babel/preset-env`](https://www.npmjs.com/package/@babel/preset-env) and [`@babel/preset-react`](https://www.npmjs.com/package/@babel/preset-react):
 
 ```sh
-$ npm install --save-dev babel-preset-env babel-preset-react
+$ npm install --save-dev @babel/preset-env @babel/preset-react
 ```
 
 ### Options
@@ -42,23 +46,23 @@ Selected options are discussed below. See the [babel](http://babeljs.io/) docs f
 Options may be passed in via standard [browserify](https://github.com/substack/node-browserify#btransformtr-opts) ways:
 
 ```sh
-$ browserify -t [ babelify --presets [ env react ] ]
+$ browserify -t [ babelify --presets [ "@babel/preset-env", "@babel/preset-react" ] ]
 ```
 
 ```js
-browserify().transform("babelify", {presets: ["env", "react"]});
+browserify().transform("babelify", {presets: ["@babel/preset-env", "@babel/preset-react"]});
 ```
 
 ```js
 var babelify = require("babelify");
-browserify().transform(babelify, {presets: ["env", "react"]});
+browserify().transform(babelify, {presets: ["@babel/preset-env", "@babel/preset-react"]});
 ```
 
 Or, with the `configure` method:
 
 ```js
 browserify().transform(babelify.configure({
-  presets: ["env", "react"]
+  presets: ["@babel/preset-env", "@babel/preset-react"]
 }));
 ```
 
@@ -178,7 +182,7 @@ specify options then you can use:
 ```json
 {
   "browserify": {
-    "transform": [["babelify", { "presets": ["env"] }]]
+    "transform": [["babelify", { "presets": ["@babel/preset-env"] }]]
   }
 }
 ```

index.js

@@ -1,6 +1,7 @@
 var stream = require("stream");
-var babel  = require("babel-core");
+var babel  = require("@babel/core");
 var util   = require("util");
+var path   = require("path")
 
 module.exports = Babelify;
 util.inherits(Babelify, stream.Transform);
@@ -22,21 +23,21 @@ Babelify.prototype._transform = function (buf, enc, callback) {
 };
 
 Babelify.prototype._flush = function (callback) {
-  try {
-    var result = babel.transform(this._data, this._opts);
-    this.emit("babelify", result, this._filename);
-    var code = result.code;
-    this.push(code);
-  } catch(err) {
-    this.emit("error", err);
-    return;
-  }
-  callback();
+  babel.transform(this._data, this._opts, (err, result) => {
+    if (err) {
+      this.emit("error", err);
+    } else {
+      this.emit("babelify", result, this._filename);
+      var code = result.code;
+      this.push(code);
+      callback();
+    }
+  });
 };
 
 Babelify.configure = function (opts) {
   opts = Object.assign({}, opts);
-  var extensions = opts.extensions ? babel.util.arrayify(opts.extensions) : null;
+  var extensions = opts.extensions || babel.DEFAULT_EXTENSIONS;
   var sourceMapsAbsolute = opts.sourceMapsAbsolute;
   if (opts.sourceMaps !== false) opts.sourceMaps = "inline";
 
@@ -62,7 +63,8 @@ Babelify.configure = function (opts) {
   if (opts.presets && opts.presets._) opts.presets = opts.presets._;
 
   return function (filename) {
-    if (!babel.util.canCompile(filename, extensions)) {
+    var extname = path.extname(filename);
+    if (extensions.indexOf(extname) === -1) {
       return stream.PassThrough();
     }