Publishing the first version of the package.

.babelrc

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+{
+  "presets": ["@babel/preset-typescript"],
+  "plugins": [
+  	"@babel/plugin-transform-modules-umd",
+	"@babel/plugin-proposal-class-properties",
+	"@babel/plugin-proposal-object-rest-spread"
+  ],
+  "moduleRoot": "src"
+}

.browserslistrc

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+last 10 version
+not dead
+IE 10
+IE 9
+IE 8
+IE 7

.eslintignore

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+# for `yarn lint` development
+coverage
+node_modules
+lib
+tests

.eslintrc.js

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+module.exports = {
+  root: true,
+  env: {
+    browser: true,
+    node: true,
+    es6: true,
+  },
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: "module",
+  },
+  plugins: ["@typescript-eslint/eslint-plugin"],
+  extends: [
+    "plugin:prettier/recommended",
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+  ],
+  rules: {
+    "no-console": "off",
+    "no-unused-vars": "off",
+    "spaced-comment": "off",
+    camelcase: "off",
+  },
+}

.gitignore

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+node_modules
+yarn.lock
+package-lock.json
+coverage
+yarn-error.log
+
+# MAC generated files
+**/.DS_Store

.prettierrc

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+{
+  "semi": false,
+  "printWidth": 100
+}

LICENSE

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+MIT License
+
+Copyright (c) [year] [fullname]
+
+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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+# Javascript Deep Cloning
+
+Javascript deep cloning, so pointers are lost.
+
+<br />
+
+<a href="https://www.npmjs.com/package/js-deep-cloning">
+  <img src="https://camo.githubusercontent.com/890acbdcb87868b382af9a4b1fac507b9659d9bf/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f6c6963656e73652d4d49542d626c75652e737667" />
+</a>
+
+<a href="https://www.npmjs.com/package/js-deep-cloning">
+  <img src="https://camo.githubusercontent.com/cf80a63dc680fa3e0d2f6b729fea1a0a14ae5a1e/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f436f7665726167652d3130302532352d627269676874677265656e2e737667" />
+</a>
+
+<a href="https://www.npmjs.com/package/js-deep-cloning">
+  <img src="https://camo.githubusercontent.com/d4e0f63e9613ee474a7dfdc23c240b9795712c96/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f5052732d77656c636f6d652d627269676874677265656e2e737667" />
+</a>
+
+## Usage
+
+### Install the package
+
+package.json
+```
+{
+  "dependencies": {
+    "js-deep-cloning": "latest"
+  }
+}
+```
+
+After that (with Yarn):
+```
+yarn install
+```
+
+Or with NPM:
+```
+npm install
+```
+
+And finally you can use it in your project:
+```
+import { deepClone } from "js-deep-cloning"
+
+const student = {
+  id: 1,
+  name: "Jack",
+  items: ["pen", "rubber", "textbook", "tablet"],
+  examDate: new Date(),
+  classmates: [
+    {
+      id: 2,
+      name: "John",
+      items: null,
+      examDate: new Date()
+    },
+    {
+      id: 2,
+      name: "James",
+      items: ["pencil", "laptop"],
+      exams: [new Date(), new Date()]
+    }
+  ],
+  university: null
+}
+
+const studentData = deepClone(student)
+```
+
+## Contribution
+
+Everybody can contribute
+
+### Useful commands (examples with yarn)
+
+Build your code:
+```
+yarn build
+```
+
+Run tests:
+```
+yarn test
+```
+
+Generate test coverage:
+```
+yarn test:coverage
+```
+
+Run ESLint:
+```
+yarn lint
+```
+
+### Important
+
+Please before opening a PR for this package - run tests and eslint and fix the errors in your code.
+
+## License
+
+MIT

lib/deep-cloning.js

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+(function (global, factory) {
+  if (typeof define === "function" && define.amd) {
+    define([], factory);
+  } else if (typeof exports !== "undefined") {
+    factory();
+  } else {
+    var mod = {
+      exports: {}
+    };
+    factory();
+    global.deepCloning = mod.exports;
+  }
+})(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : this, function () {
+  "use strict";
+
+  (function (global, factory) {
+    if (typeof define === "function" && define.amd) {
+      define(["exports"], factory);
+    } else if (typeof exports !== "undefined") {
+      factory(exports);
+    } else {
+      var mod = {
+        exports: {}
+      };
+      factory(mod.exports);
+      global.deepCloning = mod.exports;
+    }
+  })(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : void 0, function (_exports) {
+    "use strict";
+
+    Object.defineProperty(_exports, "__esModule", {
+      value: true
+    });
+    _exports.deepClone = deepClone;
+
+    function deepClone(src) {
+      let target;
+
+      if (src === null) {
+        target = src;
+      } else if (src instanceof Date) {
+        target = new Date(src);
+      } else if (typeof src === "object") {
+        if (Array.isArray(src)) {
+          target = [];
+
+          for (let i = 0; i < src.length; i++) {
+            if (src[i] instanceof Date) {
+              target.push(new Date(src[i]));
+            } else if (typeof src[i] === "object") {
+              target.push(deepClone(src[i]));
+            } else {
+              target.push(src[i]);
+            }
+          }
+        } else {
+          target = {};
+
+          for (const prop in src) {
+            if (Object.prototype.hasOwnProperty.call(src, prop)) {
+              if (src[prop] instanceof Date) {
+                target[prop] = new Date(src[prop]);
+              } else if (typeof src[prop] === "object") {
+                target[prop] = deepClone(src[prop]);
+              } else {
+                target[prop] = src[prop];
+              }
+            }
+          }
+        }
+      } else {
+        target = src;
+      }
+
+      return target;
+    }
+  });
+});

package.json

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+{
+  "name": "js-deep-cloning",
+  "version": "1.0.0",
+  "description": "Javascript deep cloning, so pointers are lost.",
+  "main": "lib/deep-cloning.js",
+  "repository": "git@github.com:viktor-maksimov/js-deep-cloning.git",
+  "author": "viktor-maksimov",
+  "license": "MIT",
+  "private": false,
+  "keywords": [
+    "object",
+    "clone",
+    "deep",
+    "javascript",
+    "typescript",
+    "pointers"
+  ],
+  "homepage": "https://github.com/viktor-maksimov/js-deep-cloning",
+  "bugs": "https://github.com/viktor-maksimov/js-deep-cloning/issues",
+  "contributors": [
+    "Andras Serfozo <subztep@gmail.com>"
+  ],
+  "scripts": {
+    "build": "babel --presets @babel/preset-typescript src/deep-cloning.ts --extensions '.ts' -d ts-compiled-temp; babel --plugins @babel/plugin-transform-modules-umd ts-compiled-temp -d lib; rm -r ts-compiled-temp",
+    "check-types": "tsc",
+    "test": "yarn check-types; jest . --passWithNoTests",
+    "test:coverage": "jest . --coverage",
+    "lint": "eslint --ext .js,.ts .",
+    "lint:debug": "eslint --debug --ext .js,.ts .",
+    "lint:fix": "eslint --fix --ext .js,.ts ."
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "@babel/cli": "^7.16.8",
+    "@babel/core": "^7.16.12",
+    "@babel/plugin-proposal-class-properties": "^7.16.7",
+    "@babel/plugin-proposal-object-rest-spread": "^7.16.7",
+    "@babel/plugin-transform-modules-umd": "^7.16.7",
+    "@babel/preset-typescript": "^7.16.7",
+    "@types/jest": "^27.4.0",
+    "@typescript-eslint/eslint-plugin": "^5.10.1",
+    "@typescript-eslint/parser": "^5.10.1",
+    "babel-jest": "^27.4.6",
+    "eslint": "^8.8.0",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-config-standard": "^16.0.3",
+    "eslint-plugin-import": "^2.25.4",
+    "eslint-plugin-jest": "^26.0.0",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-prettier": "^4.0.0",
+    "eslint-plugin-promise": "^6.0.0",
+    "eslint-plugin-standard": "^4.1.0",
+    "jest": "^27.4.7",
+    "prettier": "^2.5.1",
+    "ts-jest": "^27.1.3",
+    "typescript": "^4.5.5"
+  }
+}

src/deep-cloning.ts

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+export function deepClone(src: any): any {
+  let target: any
+  if (src === null) {
+    target = src
+  } else if (src instanceof Date) {
+    target = new Date(src)
+  } else if (typeof src === "object") {
+    if (Array.isArray(src)) {
+      target = []
+
+      for (let i = 0; i < src.length; i++) {
+        if (src[i] instanceof Date) {
+          target.push(new Date(src[i]))
+        } else if (typeof src[i] === "object") {
+          target.push(deepClone(src[i]))
+        } else {
+          target.push(src[i])
+        }
+      }
+    } else {
+      target = {}
+
+      for (const prop in src) {
+        if (Object.prototype.hasOwnProperty.call(src, prop)) {
+          if (src[prop] instanceof Date) {
+            target[prop] = new Date(src[prop])
+          } else if (typeof src[prop] === "object") {
+            target[prop] = deepClone(src[prop])
+          } else {
+            target[prop] = src[prop]
+          }
+        }
+      }
+    }
+  } else {
+    target = src
+  }
+
+  return target
+}