babel-plugin-transform-class-constructor-call - npm Package Compare versions

Comparing version 6.18.0 to 6.22.0

lib/index.js

@@ -44,4 +44,4 @@ "use strict";
   function handleClassWithCall(constructorCall, classPath) {
-    var _classPath = classPath;
-    var node = _classPath.node;
+    var _classPath = classPath,
+        node = _classPath.node;
 
@@ -48,0 +48,0 @@ var ref = node.id || classPath.scope.generateUidIdentifier("class");

package.json

 {
   "name": "babel-plugin-transform-class-constructor-call",
-  "version": "6.18.0",
+  "version": "6.22.0",
   "description": "This plugin allows Babel to transform class constructors (deprecated)",
@@ -12,9 +12,9 @@ "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-class-constructor-call",
   "dependencies": {
-    "babel-template": "^6.8.0",
+    "babel-template": "^6.22.0",
     "babel-plugin-syntax-class-constructor-call": "^6.18.0",
-    "babel-runtime": "^6.0.0"
+    "babel-runtime": "^6.22.0"
   },
   "devDependencies": {
-    "babel-helper-plugin-test-runner": "^6.18.0"
+    "babel-helper-plugin-test-runner": "^6.22.0"
   }
 }

README.md

 # babel-plugin-transform-class-constructor-call (deprecated)
 
+> Proposal Withdrawn: can be solved with decorators.
+
+This plugin allows Babel to transform class constructors.
+
+It basically allows to use the [new.target](http://mdn.io/new.target) feature on ES2015 classes:
+
+```js
+class Point {
+
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  call constructor(x, y) {
+    return new Point(x, y);
+  }
+
+}
+
+let p1 = new Point(1, 2); // OK
+let p2 = Point(3, 4); // OK
+```
+[Try in REPL](http://babeljs.io/repl/#?evaluate=true&presets=es2015%2Cstage-0&code=class%20Point%20%7B%0A%0A%20%20constructor(x%2C%20y)%20%7B%0A%20%20%20%20this.x%20%3D%20x%3B%0A%20%20%20%20this.y%20%3D%20y%3B%0A%20%20%7D%0A%0A%20%20call%20constructor(x%2C%20y)%20%7B%0A%20%20%20%20return%20new%20Point(x%2C%20y)%3B%0A%20%20%7D%0A%0A%7D%0A%0Alet%20p1%20%3D%20new%20Point(1%2C%202)%3B%20%2F%2F%20OK%0Alet%20p2%20%3D%20Point(3%2C%204)%3B%20%2F%2F%20OK)
+
+## Example
+
+### Date example
+The javascript [Date](http://mdn.io/date) works this way:
+
+```js
+// You can get a Date instance using the new keyword
+let now = new Date();
+console.log(now.getMonth()); // Prints '3'
+console.log(now.toString()); // Prints 'Mon Apr 11 2016 13:26:07 GMT+0100 (BST)'
+
+// You can get a string of the current date using Date as a function:
+let nowStr = Date();
+console.log(nowStr); // Prints 'Mon Apr 11 2016 13:26:07 GMT+0100 (BST)'
+```
+
+It is currently possible to implement something like that using [new.target](http://mdn.io/new.target) (see [example in proposal](https://github.com/tc39/ecma262/blob/master/workingdocs/callconstructor.md#motivating-example)) and this new feature makes it available for ES2015 classes.
+
+A date implementation could be:
+
+```js
+class Date {
+  constructor() {
+    // ...
+  }
+
+  call constructor() {
+    let date = new Date();
+    return date.toString();
+  }
+}
+
+let now = new Date(); // Get a Date instance
+let nowStr = Date(); // Use the 'call constructor()' part to get a string value of the current date
+```
+[Try in REPL](http://babeljs.io/repl/#?evaluate=true&presets=es2015%2Cstage-0&code=class%20Date%20%7B%0A%20%20constructor()%20%7B%0A%20%20%20%20%2F%2F%20...%0A%20%20%7D%0A%0A%20%20call%20constructor()%20%7B%0A%20%20%20%20let%20date%20%3D%20new%20Date()%3B%0A%20%20%20%20return%20date.toString()%3B%0A%20%20%7D%0A%7D%0A%0Alet%20now%20%3D%20new%20Date()%3B%20%2F%2F%20Get%20a%20Date%20instance%0Alet%20nowStr%20%3D%20Date()%3B%20%2F%2F%20Use%20the%20'call%20constructor()'%20part%20to%20get%20a%20string%20value%20of%20the%20current%20date)
+
 ## Installation
 
 ```sh
-$ npm install babel-plugin-transform-class-constructor-call
+npm install --save-dev babel-plugin-transform-class-constructor-call
 ```
@@ -24,3 +86,3 @@
 ```sh
-$ babel --plugins transform-class-constructor-call script.js
+babel --plugins transform-class-constructor-call script.js
 ```
@@ -35,1 +97,7 @@
 ```
+
+## References
+
+* [Inactive Proposals](https://github.com/tc39/proposals/blob/master/inactive-proposals.md)
+* [Proposal: Call Constructor](https://github.com/tc39/ecma262/blob/master/workingdocs/callconstructor.md)
+* [Blog post: ECMAScript proposal: function-callable classes](http://www.2ality.com/2015/10/call-constructor-esprop.html)

No alert changes

Improved metrics

Total package byte prevSize

6733

increased by72.33%

Number of lines in readme file

102

increased by200%

Dependency changes

• Updatedbabel-runtime@^6.22.0

• Updatedbabel-template@^6.22.0