init

.babelrc

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+{
+  "optional": ["runtime"],
+  "stage": 0
+}

.editorconfig

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+; editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.json]
+indent_size = 2

.eslintrc

@@ -0,0 +1,10 @@
+{
+  "extends": "standard",
+  "parser": "babel-eslint",
+  "env": {
+    "browser": true,
+    "node": true,
+    "mocha": true,
+    "es6": true
+  }
+}

.gitignore

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+coverage
+lib
+node_modules
+
+npm-debug.log

.travis.yml

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+language: node_js
+node_js:
+  - "0.10"
+  - "0.11"
+  - "0.12"
+  - "4"
+before_install:
+  - export DISPLAY=:99.0
+  - sh -e /etc/init.d/xvfb start
+install:
+  - npm install
+env:
+  - TEST_SUITE=coveralls
+  - TEST_SUITE=lint
+  - TEST_SUITE=test
+script: "npm run $TEST_SUITE"

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Kirill Fomichev
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# sync-mixin
+
+[![build status](https://img.shields.io/travis/fanatid/sync-mixin.svg?branch=master&style=flat-square)](http://travis-ci.org/fanatid/sync-mixin)
+[![Coverage Status](https://img.shields.io/coveralls/fanatid/sync-mixin.svg?style=flat-square)](https://coveralls.io/r/fanatid/sync-mixin)
+[![Dependency status](https://img.shields.io/david/fanatid/sync-mixin.svg?style=flat-square)](https://david-dm.org/fanatid/sync-mixin#info=dependencies)
+[![Dev Dependency status](https://img.shields.io/david/fanatid/sync-mixin.svg?style=flat-square)](https://david-dm.org/fanatid/sync-mixin#info=devDependencies)
+
+[![NPM](https://nodei.co/npm/sync-mixin.png?downloads=true)](https://www.npmjs.com/package/sync-mixin)
+[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
+
+## Installation
+
+```
+npm install sync-mixin
+```
+
+## API
+
+### _getSyncCount()
+
+**return**: `number`
+
+### _setSyncCount()
+
+  * `number` value
+
+### _syncEnter()
+
+### _syncExit()
+
+### _withSync()
+
+  * `function` fn
+
+**return**: `Promise`
+
+### _syncExitAll()
+
+### isSyncing()
+
+## Examples
+
+###
+
+```js
+import { mixin } from 'core-decorators'
+import SyncMixin from 'sync-mixin'
+
+@mixin(SyncMixin)
+class Process {
+  run () {
+    return this._withSync(() => {
+      // some code that require time for execution
+    })
+  }
+}
+
+let process = new Process()
+process.on('syncStart', () => console.log('Syncronization started!'))
+process.on('syncStop', () => console.log('Syncronization finished!'))
+setInterval(::process.run, 60 * 1000)
+```
+
+## License
+
+Code released under [the MIT license](LICENSE).

karma.conf.js

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+module.exports = function (config) {
+  config.set({
+    frameworks: ['browserify', 'detectBrowsers', 'mocha'],
+    files: [
+      'node_modules/babel-core/browser-polyfill.js',
+      'test/*.js'
+    ],
+    preprocessors: {
+      'test/*.js': ['browserify']
+    },
+    singleRun: true,
+    plugins: [
+      'karma-browserify',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher',
+      'karma-detect-browsers',
+      'karma-mocha'
+    ],
+    browserify: {
+      debug: true,
+      transform: [
+        ['babelify']
+      ]
+    },
+    detectBrowsers: {
+      enabled: true,
+      usePhantomJS: false,
+      postDetection: function (availableBrowser) {
+        if (process.env.TRAVIS) {
+          return ['Firefox']
+        }
+
+        var browsers = ['Chrome', 'Firefox']
+        return browsers.filter(function (browser) {
+          return availableBrowser.indexOf(browser) !== -1
+        })
+      }
+    }
+  })
+}

package.json

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+{
+  "name": "sync-mixin",
+  "version": "1.0.0",
+  "description": "Emit events in classes about sync",
+  "keywords": [
+    "syncing",
+    "mixin"
+  ],
+  "bugs": {
+    "url": "https://github.com/fanatid/sync-mixin/issues"
+  },
+  "license": "MIT",
+  "author": {
+    "name": "Kirill Fomichev",
+    "email": "fanatid@ya.ru"
+  },
+  "files": [
+    "lib",
+    "src",
+    "LICENSE",
+    "README.md"
+  ],
+  "main": "./lib/index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/fanatid/sync-mixin.git"
+  },
+  "scripts": {
+    "prepublish": "npm run clean && npm run compile",
+    "compile": "babel -d lib src",
+    "compile:watch": "babel -d lib src -w",
+    "coverage": "istanbul cover _mocha -- --compilers js:babel/register test/*.js",
+    "coveralls": "npm run coverage && coveralls <coverage/lcov.info",
+    "clean": "rm -f lib/*",
+    "lint": "eslint src test",
+    "test": "npm run test:node && npm run test:browser",
+    "test:browser": "karma start karma.conf.js",
+    "test:node": "istanbul test mocha -- --compilers js:babel/register --reporter spec test/*.js"
+  },
+  "dependencies": {
+    "babel-runtime": "^5.8.25"
+  },
+  "devDependencies": {
+    "babel": "^5.8.23",
+    "babel-core": "^5.8.25",
+    "babel-eslint": "^4.1.3",
+    "babelify": "^6.4.0",
+    "chai": "^3.4.0",
+    "core-decorators": "^0.8.1",
+    "coveralls": "^2.11.4",
+    "eslint": "^1.7.3",
+    "eslint-config-standard": "^4.4.0",
+    "eslint-plugin-standard": "^1.2.0",
+    "istanbul": "^0.4.0",
+    "karma": "^0.13.14",
+    "karma-browserify": "^4.4.0",
+    "karma-chrome-launcher": "^0.2.1",
+    "karma-detect-browsers": "^2.0.2",
+    "karma-firefox-launcher": "^0.1.6",
+    "karma-mocha": "^0.2.0",
+    "mocha": "^2.3.3"
+  }
+}

src/index.js

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+export default {
+  _getSyncCount () {
+    if (this._syncCount === undefined) {
+      this._syncCount = 0
+    }
+
+    return this._syncCount
+  },
+
+  _setSyncCount (value) {
+    this._syncCount = value
+
+    if (value === 0) {
+      return this.emit('syncStop')
+    }
+
+    if (value === 1) {
+      return this.emit('syncStart')
+    }
+  },
+
+  _syncEnter () {
+    this._setSyncCount(this._getSyncCount() + 1)
+  },
+
+  _syncExit () {
+    this._setSyncCount(this._getSyncCount() - 1)
+  },
+
+  async _withSync (fn) {
+    this._syncEnter()
+    try {
+      return await fn()
+    } finally {
+      this._syncExit()
+    }
+  },
+
+  _syncExitAll () {
+    this._setSyncCount(0)
+  },
+
+  isSyncing () {
+    return this._getSyncCount() > 0
+  }
+}