feat: finish main logic

.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 ] ])
+  });
+})

api-extractor.json

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+{
+  "$schema": "https://developer.microsoft.com/json-schemas/api-extractor/v7/api-extractor.schema.json",
+  "projectFolder": ".",
+  "mainEntryPointFilePath": "./temp/src/index.d.ts",
+
+  "apiReport": {
+    "enabled": true,
+    "reportFolder": "<projectFolder>/temp/"
+  },
+
+  "docModel": {
+    "enabled": true
+  },
+
+  "dtsRollup": {
+    "enabled": true,
+    "untrimmedFilePath": "./lib/index.d.ts"
+  },
+
+  "tsdocMetadata": {
+    "enabled": false
+  },
+
+  "messages": {
+    "compilerMessageReporting": {
+      "default": {
+        "logLevel": "warning"
+      }
+    },
+
+    "extractorMessageReporting": {
+      "default": {
+        "logLevel": "warning",
+        "addToApiReportFile": true
+      },
+
+      "ae-missing-release-tag": {
+        "logLevel": "none"
+      }
+    },
+
+    "tsdocMessageReporting": {
+      "default": {
+        "logLevel": "warning"
+      },
+
+      "tsdoc-undefined-tag": {
+        "logLevel": "none"
+      }
+    }
+  }
+}

babel.config.js

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+module.exports = {
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        modules: false,
+        targets: { node: 'current' }
+      }
+    ]
+  ],
+  plugins: ['@babel/plugin-transform-runtime'],
+  env: {
+    test: {
+      plugins: ['@babel/plugin-transform-modules-commonjs']
+    }
+  }
+}

index.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport"
+        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
+  <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <title>Document</title>
+</head>
+<body>
+<button class="start">开始</button>
+<button class="end">结束</button>
+<button class="update">改变时间间隔</button>
+<script src="dist/index.umd.js"></script>
+<script>
+  const instance = new window.EasyPolling.EasyPolling({
+    type: "single",
+    source: [1, 2, 3, 4, 5],
+    returnCount: 2,
+    intervalTime: 2000
+  })
+
+  instance.observe(cb => {
+    console.log(cb)
+  })
+
+  document.querySelector(".start").addEventListener("click", () => {
+    instance.start()
+  })
+  document.querySelector(".end").addEventListener("click", () => {
+    instance.stop()
+  })
+  document.querySelector(".update").addEventListener("click", () => {
+    instance.updateIntervalTime(5000)
+  })
+
+</script>
+</body>
+</html>

jest.config.js

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+module.exports = {
+  verbose: true,
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  testRegex: '__test__/(.*|(\\.|/)(test|spec))\\.tsx?$'
+}

package.json

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+{
+  "name": "@ifake/easy-polling",
+  "version": "0.0.0",
+  "description": "",
+  "main": "dist/index.umd.js",
+  "module": "lib/index.esm.js",
+  "scripts": {
+    "start": "cross-env NODE_ENV=development rollup -c rollup.config.ts -w",
+    "build": "cross-env NODE_ENV=production rollup -c rollup.config.ts",
+    "build:types": "tsc -p tsconfig.type.json && api-extractor run && rimraf ./temp",
+    "test": "jest",
+    "demo": "serve -l 8986"
+  },
+  "files": [
+    "lib",
+    "dist",
+    "LICENSE",
+    "CHANGELOG.md",
+    "README.md"
+  ],
+  "LICENSE": "MIT",
+  "author": "",
+  "devDependencies": {
+    "@babel/core": "^7.12.9",
+    "@babel/plugin-transform-modules-commonjs": "^7.12.1",
+    "@babel/plugin-transform-runtime": "^7.12.1",
+    "@babel/preset-env": "^7.12.7",
+    "@microsoft/api-extractor": "~7.13.2",
+    "@rollup/plugin-babel": "^5.2.2",
+    "@rollup/plugin-commonjs": "^17.0.0",
+    "@rollup/plugin-json": "^4.1.0",
+    "@rollup/plugin-node-resolve": "^11.0.0",
+    "@rollup/plugin-typescript": "^8.1.0",
+    "@types/jest": "^26.0.22",
+    "@types/node": "^14.14.37",
+    "cross-env": "^7.0.2",
+    "jest": "^26.6.3",
+    "rimraf": "^3.0.2",
+    "rollup": "^2.34.0",
+    "rollup-plugin-terser": "^7.0.2",
+    "serve": "^11.3.2",
+    "ts-jest": "^26.5.4",
+    "tslib": "^2.1.0",
+    "typescript": "~4.1.5"
+  },
+  "dependencies": {
+    "@babel/runtime": "^7.12.5"
+  }
+}