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privatereese
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node_modules
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# babel-plugin-transform-es2015-computed-properties
> Compile ES2015 computed properties to ES5
## Example
**In**
```js
var obj = {
["x" + foo]: "heh",
["y" + bar]: "noo",
foo: "foo",
bar: "bar"
};
```
**Out**
```js
var _obj;
function _defineProperty(obj, key, value) {
if (key in obj) {
Object.defineProperty(obj, key, {
value: value,
enumerable: true,
configurable: true,
writable: true
});
} else {
obj[key] = value;
}
return obj;
}
var obj = (
_obj = {},
_defineProperty(_obj, "x" + foo, "heh"),
_defineProperty(_obj, "y" + bar, "noo"),
_defineProperty(_obj, "foo", "foo"),
_defineProperty(_obj, "bar", "bar"),
_obj
);
```
## Installation
```sh
npm install --save-dev babel-plugin-transform-es2015-computed-properties
```
## Usage
### Via `.babelrc` (Recommended)
**.babelrc**
Without options:
```json
{
"plugins": ["transform-es2015-computed-properties"]
}
```
With options:
```json
{
"plugins": [
["transform-es2015-computed-properties", {
"loose": true
}]
]
}
```
### Via CLI
```sh
babel --plugins transform-es2015-computed-properties script.js
```
### Via Node API
```javascript
require("babel-core").transform("code", {
plugins: ["transform-es2015-computed-properties"]
});
```
## Options
### `loose`
`boolean`, defaults to `false`
Just like method assignment in classes, in loose mode, computed property names
use simple assignments instead of being defined. This is unlikely to be an issue
in production code.
#### Example
***In***
```js
var obj = {
["x" + foo]: "heh",
["y" + bar]: "noo",
foo: "foo",
bar: "bar"
};
```
***Out***
```js
var _obj;
var obj = (
_obj = {},
_obj["x" + foo] = "heh",
_obj["y" + bar] = "noo",
_obj.foo = "foo",
_obj.bar = "bar",
_obj
);
```

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"use strict";
exports.__esModule = true;
var _getIterator2 = require("babel-runtime/core-js/get-iterator");
var _getIterator3 = _interopRequireDefault(_getIterator2);
exports.default = function (_ref) {
var t = _ref.types,
template = _ref.template;
var buildMutatorMapAssign = template("\n MUTATOR_MAP_REF[KEY] = MUTATOR_MAP_REF[KEY] || {};\n MUTATOR_MAP_REF[KEY].KIND = VALUE;\n ");
function getValue(prop) {
if (t.isObjectProperty(prop)) {
return prop.value;
} else if (t.isObjectMethod(prop)) {
return t.functionExpression(null, prop.params, prop.body, prop.generator, prop.async);
}
}
function pushAssign(objId, prop, body) {
if (prop.kind === "get" && prop.kind === "set") {
pushMutatorDefine(objId, prop, body);
} else {
body.push(t.expressionStatement(t.assignmentExpression("=", t.memberExpression(objId, prop.key, prop.computed || t.isLiteral(prop.key)), getValue(prop))));
}
}
function pushMutatorDefine(_ref2, prop) {
var objId = _ref2.objId,
body = _ref2.body,
getMutatorId = _ref2.getMutatorId,
scope = _ref2.scope;
var key = !prop.computed && t.isIdentifier(prop.key) ? t.stringLiteral(prop.key.name) : prop.key;
var maybeMemoise = scope.maybeGenerateMemoised(key);
if (maybeMemoise) {
body.push(t.expressionStatement(t.assignmentExpression("=", maybeMemoise, key)));
key = maybeMemoise;
}
body.push.apply(body, buildMutatorMapAssign({
MUTATOR_MAP_REF: getMutatorId(),
KEY: key,
VALUE: getValue(prop),
KIND: t.identifier(prop.kind)
}));
}
function loose(info) {
for (var _iterator = info.computedProps, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : (0, _getIterator3.default)(_iterator);;) {
var _ref3;
if (_isArray) {
if (_i >= _iterator.length) break;
_ref3 = _iterator[_i++];
} else {
_i = _iterator.next();
if (_i.done) break;
_ref3 = _i.value;
}
var prop = _ref3;
if (prop.kind === "get" || prop.kind === "set") {
pushMutatorDefine(info, prop);
} else {
pushAssign(info.objId, prop, info.body);
}
}
}
function spec(info) {
var objId = info.objId,
body = info.body,
computedProps = info.computedProps,
state = info.state;
for (var _iterator2 = computedProps, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : (0, _getIterator3.default)(_iterator2);;) {
var _ref4;
if (_isArray2) {
if (_i2 >= _iterator2.length) break;
_ref4 = _iterator2[_i2++];
} else {
_i2 = _iterator2.next();
if (_i2.done) break;
_ref4 = _i2.value;
}
var prop = _ref4;
var key = t.toComputedKey(prop);
if (prop.kind === "get" || prop.kind === "set") {
pushMutatorDefine(info, prop);
} else if (t.isStringLiteral(key, { value: "__proto__" })) {
pushAssign(objId, prop, body);
} else {
if (computedProps.length === 1) {
return t.callExpression(state.addHelper("defineProperty"), [info.initPropExpression, key, getValue(prop)]);
} else {
body.push(t.expressionStatement(t.callExpression(state.addHelper("defineProperty"), [objId, key, getValue(prop)])));
}
}
}
}
return {
visitor: {
ObjectExpression: {
exit: function exit(path, state) {
var node = path.node,
parent = path.parent,
scope = path.scope;
var hasComputed = false;
for (var _iterator3 = node.properties, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : (0, _getIterator3.default)(_iterator3);;) {
var _ref5;
if (_isArray3) {
if (_i3 >= _iterator3.length) break;
_ref5 = _iterator3[_i3++];
} else {
_i3 = _iterator3.next();
if (_i3.done) break;
_ref5 = _i3.value;
}
var prop = _ref5;
hasComputed = prop.computed === true;
if (hasComputed) break;
}
if (!hasComputed) return;
var initProps = [];
var computedProps = [];
var foundComputed = false;
for (var _iterator4 = node.properties, _isArray4 = Array.isArray(_iterator4), _i4 = 0, _iterator4 = _isArray4 ? _iterator4 : (0, _getIterator3.default)(_iterator4);;) {
var _ref6;
if (_isArray4) {
if (_i4 >= _iterator4.length) break;
_ref6 = _iterator4[_i4++];
} else {
_i4 = _iterator4.next();
if (_i4.done) break;
_ref6 = _i4.value;
}
var _prop = _ref6;
if (_prop.computed) {
foundComputed = true;
}
if (foundComputed) {
computedProps.push(_prop);
} else {
initProps.push(_prop);
}
}
var objId = scope.generateUidIdentifierBasedOnNode(parent);
var initPropExpression = t.objectExpression(initProps);
var body = [];
body.push(t.variableDeclaration("var", [t.variableDeclarator(objId, initPropExpression)]));
var callback = spec;
if (state.opts.loose) callback = loose;
var mutatorRef = void 0;
var getMutatorId = function getMutatorId() {
if (!mutatorRef) {
mutatorRef = scope.generateUidIdentifier("mutatorMap");
body.push(t.variableDeclaration("var", [t.variableDeclarator(mutatorRef, t.objectExpression([]))]));
}
return mutatorRef;
};
var single = callback({
scope: scope,
objId: objId,
body: body,
computedProps: computedProps,
initPropExpression: initPropExpression,
getMutatorId: getMutatorId,
state: state
});
if (mutatorRef) {
body.push(t.expressionStatement(t.callExpression(state.addHelper("defineEnumerableProperties"), [objId, mutatorRef])));
}
if (single) {
path.replaceWith(single);
} else {
body.push(t.expressionStatement(objId));
path.replaceWithMultiple(body);
}
}
}
}
};
};
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
module.exports = exports["default"];

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{
"_args": [
[
"babel-plugin-transform-es2015-computed-properties@^6.8.0",
"/home/bernhard/freifunk-app/node_modules/babel-preset-fbjs"
]
],
"_from": "babel-plugin-transform-es2015-computed-properties@>=6.8.0 <7.0.0",
"_id": "babel-plugin-transform-es2015-computed-properties@6.24.1",
"_inCache": true,
"_installable": true,
"_location": "/babel-plugin-transform-es2015-computed-properties",
"_nodeVersion": "6.9.0",
"_npmOperationalInternal": {
"host": "packages-12-west.internal.npmjs.com",
"tmp": "tmp/babel-plugin-transform-es2015-computed-properties-6.24.1.tgz_1491578362134_0.8491923431865871"
},
"_npmUser": {
"email": "hi@henryzoo.com",
"name": "hzoo"
},
"_npmVersion": "3.10.10",
"_phantomChildren": {},
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"name": "babel-plugin-transform-es2015-computed-properties",
"raw": "babel-plugin-transform-es2015-computed-properties@^6.8.0",
"rawSpec": "^6.8.0",
"scope": null,
"spec": ">=6.8.0 <7.0.0",
"type": "range"
},
"_requiredBy": [
"/babel-preset-fbjs",
"/babel-preset-react-native"
],
"_resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-computed-properties/-/babel-plugin-transform-es2015-computed-properties-6.24.1.tgz",
"_shasum": "6fe2a8d16895d5634f4cd999b6d3480a308159b3",
"_shrinkwrap": null,
"_spec": "babel-plugin-transform-es2015-computed-properties@^6.8.0",
"_where": "/home/bernhard/freifunk-app/node_modules/babel-preset-fbjs",
"dependencies": {
"babel-runtime": "^6.22.0",
"babel-template": "^6.24.1"
},
"description": "Compile ES2015 computed properties to ES5",
"devDependencies": {
"babel-helper-plugin-test-runner": "^6.24.1"
},
"directories": {},
"dist": {
"shasum": "6fe2a8d16895d5634f4cd999b6d3480a308159b3",
"tarball": "https://registry.npmjs.org/babel-plugin-transform-es2015-computed-properties/-/babel-plugin-transform-es2015-computed-properties-6.24.1.tgz"
},
"keywords": [
"babel-plugin"
],
"license": "MIT",
"main": "lib/index.js",
"maintainers": [
{
"name": "amasad",
"email": "amjad.masad@gmail.com"
},
{
"name": "hzoo",
"email": "hi@henryzoo.com"
},
{
"name": "jmm",
"email": "npm-public@jessemccarthy.net"
},
{
"name": "loganfsmyth",
"email": "loganfsmyth@gmail.com"
},
{
"name": "sebmck",
"email": "sebmck@gmail.com"
},
{
"name": "thejameskyle",
"email": "me@thejameskyle.com"
}
],
"name": "babel-plugin-transform-es2015-computed-properties",
"optionalDependencies": {},
"readme": "ERROR: No README data found!",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-es2015-computed-properties"
},
"scripts": {},
"version": "6.24.1"
}