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  "readme": "# co\n\n[![Gitter][gitter-image]][gitter-url]\n[![NPM version][npm-image]][npm-url]\n[![Build status][travis-image]][travis-url]\n[![Test coverage][coveralls-image]][coveralls-url]\n[![Downloads][downloads-image]][downloads-url]\n\n  Generator based control flow goodness for nodejs and the browser,\n  using promises, letting you write non-blocking code in a nice-ish way.\n\n## Co v4\n\n  `co@4.0.0` has been released, which now relies on promises.\n  It is a stepping stone towards [ES7 async/await](https://github.com/lukehoban/ecmascript-asyncawait).\n  The primary API change is how `co()` is invoked.\n  Before, `co` returned a \"thunk\", which you then called with a callback and optional arguments.\n  Now, `co()` returns a promise.\n\n```js\nco(function* () {\n  var result = yield Promise.resolve(true);\n  return result;\n}).then(function (value) {\n  console.log(value);\n}, function (err) {\n  console.error(err.stack);\n});\n```\n\n  If you want to convert a `co`-generator-function into a regular function that returns a promise,\n  you now use `co.wrap(fn*)`.\n\n```js\nvar fn = co.wrap(function* (val) {\n  return yield Promise.resolve(val);\n});\n\nfn(true).then(function (val) {\n\n});\n```\n\n## Platform Compatibility\n\n  `co@4+` requires a `Promise` implementation.\n  For versions of node `< 0.11` and for many older browsers,\n  you should/must include your own `Promise` polyfill.\n\n  When using node 0.11.x or greater, you must use the `--harmony-generators`\n  flag or just `--harmony` to get access to generators.\n\n  When using node 0.10.x and lower or browsers without generator support,\n  you must use [gnode](https://github.com/TooTallNate/gnode) and/or [regenerator](http://facebook.github.io/regenerator/).\n\n  io.js is supported out of the box, you can use `co` without flags or polyfills.\n\n## Installation\n\n```\n$ npm install co\n```\n\n## Associated libraries\n\nAny library that returns promises work well with `co`.\n\n- [mz](https://github.com/normalize/mz) - wrap all of node's code libraries as promises.\n\nView the [wiki](https://github.com/visionmedia/co/wiki) for more libraries.\n\n## Examples\n\n```js\nvar co = require('co');\n\nco(function *(){\n  // yield any promise\n  var result = yield Promise.resolve(true);\n}).catch(onerror);\n\nco(function *(){\n  // resolve multiple promises in parallel\n  var a = Promise.resolve(1);\n  var b = Promise.resolve(2);\n  var c = Promise.resolve(3);\n  var res = yield [a, b, c];\n  console.log(res);\n  // => [1, 2, 3]\n}).catch(onerror);\n\n// errors can be try/catched\nco(function *(){\n  try {\n    yield Promise.reject(new Error('boom'));\n  } catch (err) {\n    console.error(err.message); // \"boom\"\n }\n}).catch(onerror);\n\nfunction onerror(err) {\n  // log any uncaught errors\n  // co will not throw any errors you do not handle!!!\n  // HANDLE ALL YOUR ERRORS!!!\n  console.error(err.stack);\n}\n```\n\n## Yieldables\n\n  The `yieldable` objects currently supported are:\n\n  - promises\n  - thunks (functions)\n  - array (parallel execution)\n  - objects (parallel execution)\n  - generators (delegation)\n  - generator functions (delegation)\n\nNested `yieldable` objects are supported, meaning you can nest\npromises within objects within arrays, and so on!\n\n### Promises\n\n[Read more on promises!](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)\n\n### Thunks\n\nThunks are functions that only have a single argument, a callback.\nThunk support only remains for backwards compatibility and may\nbe removed in future versions of `co`.\n\n### Arrays\n\n`yield`ing an array will resolve all the `yieldables` in parallel.\n\n```js\nco(function* () {\n  var res = yield [\n    Promise.resolve(1),\n    Promise.resolve(2),\n    Promise.resolve(3),\n  ];\n  console.log(res); // => [1, 2, 3]\n}).catch(onerror);\n```\n\n### Objects\n\nJust like arrays, objects resolve all `yieldable`s in parallel.\n\n```js\nco(function* () {\n  var res = yield {\n    1: Promise.resolve(1),\n    2: Promise.resolve(2),\n  };\n  console.log(res); // => { 1: 1, 2: 2 }\n}).catch(onerror);\n```\n\n### Generators and Generator Functions\n\nAny generator or generator function you can pass into `co`\ncan be yielded as well. This should generally be avoided\nas we should be moving towards spec-compliant `Promise`s instead.\n\n## API\n\n### co(fn*).then( val => )\n\nReturns a promise that resolves a generator, generator function,\nor any function that returns a generator.\n\n```js\nco(function* () {\n  return yield Promise.resolve(true);\n}).then(function (val) {\n  console.log(val);\n}, function (err) {\n  console.error(err.stack);\n});\n```\n\n### var fn = co.wrap(fn*)\n\nConvert a generator into a regular function that returns a `Promise`.\n\n```js\nvar fn = co.wrap(function* (val) {\n  return yield Promise.resolve(val);\n});\n\nfn(true).then(function (val) {\n\n});\n```\n\n## License\n\n  MIT\n\n[npm-image]: https://img.shields.io/npm/v/co.svg?style=flat-square\n[npm-url]: https://npmjs.org/package/co\n[travis-image]: https://img.shields.io/travis/tj/co.svg?style=flat-square\n[travis-url]: https://travis-ci.org/tj/co\n[coveralls-image]: https://img.shields.io/coveralls/tj/co.svg?style=flat-square\n[coveralls-url]: https://coveralls.io/r/tj/co\n[downloads-image]: http://img.shields.io/npm/dm/co.svg?style=flat-square\n[downloads-url]: https://npmjs.org/package/co\n[gitter-image]: https://badges.gitter.im/Join%20Chat.svg\n[gitter-url]: https://gitter.im/tj/co?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge\n",
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