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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
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-# babel-plugin-transform-es2015-for-of
-
-> Compile ES2015 for...of to ES5
-
-## Example
-
-**In**
-
-```js
-for (var i of foo) {}
-```
-
-**Out**
-
-```js
-var _iteratorNormalCompletion = true;
-var _didIteratorError = false;
-var _iteratorError = undefined;
-
-try {
- for (var _iterator = foo[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
- var i = _step.value;
- }
-} catch (err) {
- _didIteratorError = true;
- _iteratorError = err;
-} finally {
- try {
- if (!_iteratorNormalCompletion && _iterator.return) {
- _iterator.return();
- }
- } finally {
- if (_didIteratorError) {
- throw _iteratorError;
- }
- }
-}
-```
-
-## Installation
-
-```sh
-npm install --save-dev babel-plugin-transform-es2015-for-of
-```
-
-## Usage
-
-### Via `.babelrc` (Recommended)
-
-**.babelrc**
-
-```js
-// without options
-{
- "plugins": ["transform-es2015-for-of"]
-}
-
-// with options
-{
- "plugins": [
- ["transform-es2015-for-of", {
- "loose": true
- }]
- ]
-}
-```
-
-### Via CLI
-
-```sh
-babel --plugins transform-es2015-for-of script.js
-```
-
-### Via Node API
-
-```javascript
-require("babel-core").transform("code", {
- plugins: ["transform-es2015-for-of"]
-});
-```
-
-## Options
-
-### `loose`
-
-`boolean`, defaults to `false`
-
-In loose mode, arrays are put in a fast path, thus heavily increasing performance.
-All other iterables will continue to work fine.
-
-#### Example
-
-**In**
-
-```js
-for (var i of foo) {}
-```
-
-**Out**
-
-```js
-for (var _iterator = foo, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
- var _ref;
-
- if (_isArray) {
- if (_i >= _iterator.length) break;
- _ref = _iterator[_i++];
- } else {
- _i = _iterator.next();
- if (_i.done) break;
- _ref = _i.value;
- }
-
- var i = _ref;
-}
-```
-
-#### Abrupt completions
-
-In loose mode an iterator's `return` method will not be called on abrupt completions caused by thrown errors.
-
-Please see [google/traceur-compiler#1773](https://github.com/google/traceur-compiler/issues/1773) and
-[babel/babel#838](https://github.com/babel/babel/issues/838) for more information.
-
-### Optimization
-
-If a basic array is used, Babel will compile the for-of loop down to a regular for loop.
-
-**In**
-
-```js
-for (let a of [1,2,3]) {}
-```
-
-**Out**
-
-```js
-var _arr = [1, 2, 3];
-for (var _i = 0; _i < _arr.length; _i++) {
- var a = _arr[_i];
-}
-```