feat: finish main logic

Author: 毕宇旗

.editorconfig

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+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.eslintignore

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+node_modules
+dist
+coverage
+lib

.eslintrc.js

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+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    node: true
+  },
+  parserOptions: {
+    ecmaVersion: 12,
+    sourceType: 'module'
+  },
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint', 'prettier'],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'prettier/@typescript-eslint',
+    'plugin:prettier/recommended'
+  ],
+  rules: {
+    'prefer-const': [
+      'error',
+      {
+        destructuring: 'any',
+        ignoreReadBeforeAssign: false
+      }
+    ],
+    'no-unused-vars': 0
+  }
+}

.gitignore

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+.DS_Store
+node_modules
+dist
+coverage
+lib
+
+package-lock.json
+yarn.lock
+
+# local env files
+.env.local
+.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

.prettierignore

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+dist
+lib
+node_modules
+package.json
+yarn.lock

.prettierrc.js

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+module.exports = {
+  singleQuote: true,
+  printWidth: 100,
+  proseWrap: 'never',
+  semi: false,
+  trailingComma: 'none',
+  arrowParens: 'avoid'
+}

LICENSE

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+MIT License
+
+Copyright (c) 2021 unknow
+
+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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+# Welcome to @ifake/easy-polling 👋
+![Version](https://img.shields.io/npm/v/@ifake/easy-polling)
+![Npm Bundle Size](https://img.shields.io/bundlephobia/min/@ifake/easy-polling)
+![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)
+
+> The Class used to compute the next step of data.
+
+The scaffolding for this project is from [pkg](https://github.com/ifakejs/pkg)
+
+### 🏠 [Homepage](https://github.com/ifakejs/easy-polling)
+
+### Usage
+```sh
+import { EasyPolling } from "@ifake/easy-polling";
+
+const instance = new EasyPolling({
+  source: [param1, param2, param3...],
+  intervalTime: 2000 // 毫秒
+  type: 'single' || 'double'
+  returnCount: 2 // 每次返回的数据大小
+})
+instance.observe((data) => {
+  // 根据间隔时长，返回对应的内容
+})
+instance.start()
+// stop
+instance.stop()
+
+// update intervalTime
+instance.updateIntervalTime(5000)
+```
+
+## Author
+
+👤 **BiYuqi**
+## 🤝 Contributing
+
+Contributions, issues and feature requests are welcome!
+
+Feel free to check [issues page](https://github.com/ifakejs/easy-polling/issues). 
+
+## Show your support
+
+Give a ⭐️ if this project helped you!
+
+## 📝 License
+
+This project is [MIT](https://github.com/ifakejs/easy-loop/blob/master/LICENSE) licensed.
+
+***
+_This README was generated with ❤️ by [readme-md-generator](https://github.com/kefranabg/readme-md-generator)_

__test__/Q.spec.ts

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+import { Q } from "../src/Q"
+
+describe("Q", () => {
+  let instance: Q
+  beforeEach(() => {
+    instance = new Q()
+  })
+  it('enqueue ', () => {
+    instance.enqueue(1)
+    expect(instance.queue).toEqual([1])
+  })
+
+  it('enqueue ', () => {
+    instance.enqueue(1)
+    expect(instance.dequeue()).toEqual(1)
+  })
+
+  it('front ', () => {
+    instance.enqueue(2)
+    instance.enqueue(1)
+    expect(instance.front()).toEqual(2)
+  })
+
+  it('clear ', () => {
+    instance.enqueue(2)
+    instance.enqueue(1)
+    instance.clear()
+    expect(instance.queue).toEqual([])
+  })
+
+  it('isEmpty ', () => {
+    expect(instance.isEmpty).toEqual(true)
+    instance.enqueue(2)
+    expect(instance.isEmpty).toEqual(false)
+  })
+})

__test__/chunk.spec.ts

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+import { chunk } from "../src/chunk"
+
+describe("chunk", () => {
+  it('should return correct error message', () => {
+    try {
+      // @ts-ignore
+      chunk("", 2)
+    } catch (e) {
+      expect(e.message).toBe("Required an array.")
+    }
+  });
+  it('should split array correct', () => {
+    expect(chunk([1, 2, 3, 4, 5], 2)).toEqual([ [ 1, 2 ], [ 3, 4 ], [ 5 ] ])
+  });
+})