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# 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 Proposal Withdrawn: can be solved with decorators.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
```
## 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
```
## Installation
```sh
npm install --save-dev babel-plugin-transform-class-constructor-call
```
## Usage
### Via `.babelrc` (Recommended)
**.babelrc**
```json
{
"plugins": ["transform-class-constructor-call"]
}
```
### Via CLI
```sh
babel --plugins transform-class-constructor-call script.js
```
### Via Node API
```javascript
require("babel-core").transform("code", {
plugins: ["transform-class-constructor-call"]
});
```
## 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)

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"use strict";
exports.__esModule = true;
var _getIterator2 = require("babel-runtime/core-js/get-iterator");
var _getIterator3 = _interopRequireDefault(_getIterator2);
var _symbol = require("babel-runtime/core-js/symbol");
var _symbol2 = _interopRequireDefault(_symbol);
exports.default = function (_ref) {
var t = _ref.types;
var ALREADY_VISITED = (0, _symbol2.default)();
function findConstructorCall(path) {
var methods = path.get("body.body");
for (var _iterator = methods, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : (0, _getIterator3.default)(_iterator);;) {
var _ref2;
if (_isArray) {
if (_i >= _iterator.length) break;
_ref2 = _iterator[_i++];
} else {
_i = _iterator.next();
if (_i.done) break;
_ref2 = _i.value;
}
var method = _ref2;
if (method.node.kind === "constructorCall") {
return method;
}
}
return null;
}
function handleClassWithCall(constructorCall, classPath) {
var _classPath = classPath,
node = _classPath.node;
var ref = node.id || classPath.scope.generateUidIdentifier("class");
if (classPath.parentPath.isExportDefaultDeclaration()) {
classPath = classPath.parentPath;
classPath.insertAfter(t.exportDefaultDeclaration(ref));
}
classPath.replaceWithMultiple(buildWrapper({
CLASS_REF: classPath.scope.generateUidIdentifier(ref.name),
CALL_REF: classPath.scope.generateUidIdentifier(ref.name + "Call"),
CALL: t.functionExpression(null, constructorCall.node.params, constructorCall.node.body),
CLASS: t.toExpression(node),
WRAPPER_REF: ref
}));
constructorCall.remove();
}
return {
inherits: require("babel-plugin-syntax-class-constructor-call"),
visitor: {
Class: function Class(path) {
if (path.node[ALREADY_VISITED]) return;
path.node[ALREADY_VISITED] = true;
var constructorCall = findConstructorCall(path);
if (constructorCall) {
handleClassWithCall(constructorCall, path);
} else {
return;
}
}
}
};
};
var _babelTemplate = require("babel-template");
var _babelTemplate2 = _interopRequireDefault(_babelTemplate);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var buildWrapper = (0, _babelTemplate2.default)("\n let CLASS_REF = CLASS;\n var CALL_REF = CALL;\n var WRAPPER_REF = function (...args) {\n if (this instanceof WRAPPER_REF) {\n return Reflect.construct(CLASS_REF, args);\n } else {\n return CALL_REF.apply(this, args);\n }\n };\n WRAPPER_REF.__proto__ = CLASS_REF;\n WRAPPER_REF;\n");
module.exports = exports["default"];

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{
"_from": "babel-plugin-transform-class-constructor-call@^6.24.1",
"_id": "babel-plugin-transform-class-constructor-call@6.24.1",
"_inBundle": false,
"_integrity": "sha1-gNwoVQWsBn3LjWxl4vbxGrd2Xvk=",
"_location": "/babel-plugin-transform-class-constructor-call",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "babel-plugin-transform-class-constructor-call@^6.24.1",
"name": "babel-plugin-transform-class-constructor-call",
"escapedName": "babel-plugin-transform-class-constructor-call",
"rawSpec": "^6.24.1",
"saveSpec": null,
"fetchSpec": "^6.24.1"
},
"_requiredBy": [
"/babel-preset-stage-1"
],
"_resolved": "https://registry.npmjs.org/babel-plugin-transform-class-constructor-call/-/babel-plugin-transform-class-constructor-call-6.24.1.tgz",
"_shasum": "80dc285505ac067dcb8d6c65e2f6f11ab7765ef9",
"_spec": "babel-plugin-transform-class-constructor-call@^6.24.1",
"_where": "/Applications/XAMPP/xamppfiles/htdocs/wordpress/t-latehome/wp-content/plugins/opal-estate-pro/node_modules/babel-preset-stage-1",
"bundleDependencies": false,
"dependencies": {
"babel-plugin-syntax-class-constructor-call": "^6.18.0",
"babel-runtime": "^6.22.0",
"babel-template": "^6.24.1"
},
"deprecated": false,
"description": "This plugin allows Babel to transform class constructors (deprecated)",
"devDependencies": {
"babel-helper-plugin-test-runner": "^6.24.1"
},
"keywords": [
"babel-plugin"
],
"license": "MIT",
"main": "lib/index.js",
"name": "babel-plugin-transform-class-constructor-call",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-class-constructor-call"
},
"version": "6.24.1"
}