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function-sandbox \u003ca href=\"https://www.npmjs.com/package/function-sandbox\"\u003e\u003cimg src=\"https://img.shields.io/npm/v/function-sandbox.svg\"\u003e\u003c/a\u003e\n\n\u003cimg align=\"right\" height=\"128\" src=\"https://raw.githubusercontent.com/shenfe/function-sandbox/master/readme_assets/figure-before.png\"\u003e\n\n📦 Make a sandbox for a function, **isolating the function's effects**, **blocking outer-scoped variables** (e.g. `window`, `global`) **and dangerious operations** (e.g. `eval()`, `new Function()`).\n\nAll the module exports is a main function.\n\n## Input/Output\n\n### input (parameter)\n\nA function or string of a function.\n\n### output (return)\n\nA function or string of a function.\n\n## Installation\n\n```bash\n$ npm install --save function-sandbox\n```\n\n## Usage\n\n### example\n\n```js\nconst fnsb = require('function-sandbox');\n\nlet a = 1;\n\nlet f1 = function (b) {\n    console.log(a = b + 1);\n//              ^\n    console.log(c);\n//              ^\n    function f() {\n        console.log(d);\n        console.log(e);\n//                  ^\n        console.log(window);\n//                  ^\n        console.log(global);\n//                  ^\n        eval('console.log(\"using eval()\")');\n//      ^\n        (new Function('console.log(\"using new Function()\")'))();\n//           ^\n    }\n    var F = f.constructor;\n    (new F('console.log(\"using new Function()\")'))();\n//       ^\n    var d = 1;\n    return f();\n};\n\nlet f2 = fnsb(f1, true);    // `f2` is function\nf2(1);                      // =\u003e 2 undefined 1 undefined {} {}\nconsole.log(a);             // =\u003e 1\n\nlet f3 = fnsb(f1);          // `f3` is string\n```\n\nNow `f3` is such a **string** of a function:\n\n```\n\"function () { var window = {}, global = {}, process = {}, Function = function () { return function () {} }, eval = function () {}; return (function (b) {\n    'use strict';\n    var a, c, e;\n    ... Here is the original function body ...\n}).apply(null, arguments); }\"\n```\n\n### options\n\nThe second parameter is optional and can be either Boolean or Object. When it is `true`, the main function will return a function instead of a string. When it is an object, it has several properties to be set:\n\n| property | value | example |\n| :---: | :--- | :---: |\n| asFunction | Boolean, whether to return a function or a string. | `true` |\n| whiteList | Array, a list of variable names not to be blocked. | `['$']` `['Promise', 'JSON']` |\n| injection | Object, a map from variable name to value. | `{ a: 1, b: function (x) { return x * x; } }` |\n\n## More Related\n\n* The [Function](http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.2) in JavaScript.\n* Node.js [vm](https://nodejs.org/api/vm.html).\n* [Web Worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API).\n\n## License\n\n[MIT](http://opensource.org/licenses/MIT)\n\nCopyright © 2018-present, [shenfe](https://github.com/shenfe)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshenfe%2Ffunction-sandbox","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fshenfe%2Ffunction-sandbox","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshenfe%2Ffunction-sandbox/lists"}