103 lines
5.4 KiB
JSON
103 lines
5.4 KiB
JSON
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"description": "Compile ES2015 for...of to ES5",
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"main": "lib/index.js",
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"name": "babel-plugin-transform-es2015-for-of",
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"optionalDependencies": {},
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"readme": "# babel-plugin-transform-es2015-for-of\n\n> Compile ES2015 for...of to ES5\n\n## Example\n\n**In**\n\n```js\nfor (var i of foo) {}\n```\n\n**Out**\n\n```js\nvar _iteratorNormalCompletion = true;\nvar _didIteratorError = false;\nvar _iteratorError = undefined;\n\ntry {\n for (var _iterator = foo[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {\n var i = _step.value;\n }\n} catch (err) {\n _didIteratorError = true;\n _iteratorError = err;\n} finally {\n try {\n if (!_iteratorNormalCompletion && _iterator.return) {\n _iterator.return();\n }\n } finally {\n if (_didIteratorError) {\n throw _iteratorError;\n }\n }\n}\n```\n\n## Installation\n\n```sh\nnpm install --save-dev babel-plugin-transform-es2015-for-of\n```\n\n## Usage\n\n### Via `.babelrc` (Recommended)\n\n**.babelrc**\n\n```js\n// without options\n{\n \"plugins\": [\"transform-es2015-for-of\"]\n}\n\n// with options\n{\n \"plugins\": [\n [\"transform-es2015-for-of\", {\n \"loose\": true\n }]\n ]\n}\n```\n\n### Via CLI\n\n```sh\nbabel --plugins transform-es2015-for-of script.js\n```\n\n### Via Node API\n\n```javascript\nrequire(\"babel-core\").transform(\"code\", {\n plugins: [\"transform-es2015-for-of\"]\n});\n```\n\n## Options\n\n### `loose`\n\n`boolean`, defaults to `false`\n\nIn loose mode, arrays are put in a fast path, thus heavily increasing performance.\nAll other iterables will continue to work fine.\n\n#### Example\n\n**In**\n\n```js\nfor (var i of foo) {}\n```\n\n**Out**\n\n```js\nfor (var _iterator = foo, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {\n var _ref;\n\n if (_isArray) {\n if (_i >= _iterator.length) break;\n _ref = _iterator[_i++];\n } else {\n _i = _iterator.next();\n if (_i.done) break;\n _ref = _i.value;\n }\n\n var i = _ref;\n}\n```\n\n#### Abrupt completions\n\nIn loose mode an iterator's `return` method will not be called on abrupt completions caused by thrown errors.\n\nPlease see [google/traceur-compiler#1773](https://github.com/google/traceur-compiler/issues/1773) and\n[babel/babel#838](https://github.com/babel/babel/issues/838) for more information.\n\n### Optimization\n\nIf a basic array is used, Babel will compile the for-of loop down to a regular for loop.\n\n**In**\n\n```js\nfor (let a of [1,2,3]) {}\n```\n\n**Out**\n\n```js\nvar _arr = [1, 2, 3];\nfor (var _i = 0; _i < _arr.length; _i++) {\n var a = _arr[_i];\n}\n```\n",
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"readmeFilename": "README.md",
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"repository": {
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"type": "git",
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"url": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-es2015-for-of"
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"version": "6.23.0"
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