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interceptable\nEasily intercept calls to function properties\n\n✨ [![Build Status](http://img.shields.io/travis/seppevs/interceptable.svg?style=flat)](https://travis-ci.org/seppevs/interceptable) [![Coverage Status](https://coveralls.io/repos/github/seppevs/interceptable/badge.svg?branch=master)](https://coveralls.io/r/seppevs/interceptable) [![NPM](http://img.shields.io/npm/v/interceptable.svg?style=flat)](https://www.npmjs.org/package/interceptable) [![Downloads](http://img.shields.io/npm/dm/interceptable.svg?style=flat)](https://www.npmjs.org/package/interceptable) [![Dependencies](https://david-dm.org/seppevs/interceptable.svg)](https://david-dm.org/seppevs/interceptable) [![Known Vulnerabilities](https://snyk.io/test/github/seppevs/interceptable/badge.svg)](https://snyk.io/test/github/seppevs/interceptable) ✨\n\n## Introduction\nWith this module, you can intercept calls to function properties on an object \n* You hook in before and/or after a function is called\n* Both sync and async function calls are interceptable\n\n## Installation\n```bash\n$ npm install interceptable --save\n```\n\n## Demo's\n\n### Intercept synchronous functions that return a value (sync / success)\n```javascript\nconst interceptable = require('interceptable');\n\nconst obj = {\n  sayHello(name) {\n    console.log('... inside sayHello');\n    return `Hello ${name}!`;\n  }\n};\n\nconst interceptor = ({ fn, args }) =\u003e {\n  console.log(`BEFORE call to ${fn} with args ${args}`);\n  return {\n    onSuccess(result) {\n      console.log(`AFTER call to ${fn} with args ${args} -\u003e result: ${result}`);\n    },\n  };\n};\n\nconst interceptableObj = interceptable(obj, interceptor);\ninterceptableObj.sayHello('Sam');\n\n// OUTPUT:\n// BEFORE call to sayHello with args Sam\n// ... inside sayHello\n// AFTER call to sayHello with args Sam -\u003e result: Hello Sam!\n```\n\n### Intercept synchronous functions that throw an error (sync / error)\n```javascript\nconst interceptable = require('interceptable');\n\nconst obj = {\n  sayHello(name) {\n    console.log('... inside sayHello');\n    throw new Error(`Cannot say hello to ${name}!`);\n  }\n};\n\nconst interceptor = ({ fn, args }) =\u003e {\n  console.log(`BEFORE call to ${fn} with args ${args}`);\n  return {\n    onError(err) {\n      console.log(`AFTER call to ${fn} with args ${args} -\u003e error: ${err.message}`);\n    },\n  };\n};\n\nconst interceptableObj = interceptable(obj, interceptor);\ninterceptableObj.sayHello('Sam');\n\n// OUTPUT:\n// BEFORE call to sayHello with args Sam\n// ... inside sayHello\n// AFTER call to sayHello with args Sam -\u003e error: Cannot say hello to Sam!\n// /Users/seb/Work/Github/interceptable/src/interceptable.js:20\n//             throw err;\n//             ^\n// \n// Error: Cannot say hello to Sam!\n//     at Object.sayHello (/Users/seb/Work/Github/interceptable/manual.js:6:11)\n//      ... \n```\n\n### Intercept asynchronous functions that resolve a value (async / success)\n```javascript\nconst interceptable = require('interceptable');\n\nconst obj = {\n  sayHello(name) {\n    console.log('... inside sayHello');\n    return Promise.resolve(`Hello ${name}!`);\n  }\n};\n\nconst interceptor = ({ fn, args }) =\u003e {\n  console.log(`BEFORE call to ${fn} with args ${args}`);\n  return {\n    onSuccess(result) {\n      console.log(`AFTER call to ${fn} with args ${args} -\u003e result: ${result}`);\n    },\n  };\n};\n\nconst interceptableObj = interceptable(obj, interceptor);\ninterceptableObj.sayHello('Sam');\n\n// OUTPUT:\n// BEFORE call to sayHello with args Sam\n// ... inside sayHello\n// AFTER call to sayHello with args Sam -\u003e result: Hello Sam!\n```\n### Intercept asynchronous functions that rejects an error (async / error)\n```javascript\nconst interceptable = require('interceptable');\n\nconst obj = {\n  sayHello(name) {\n    console.log('... inside sayHello');\n    return Promise.reject(new Error(`Cannot say hello to ${name}!`));\n  }\n};\n\nconst interceptor = ({ fn, args }) =\u003e {\n  console.log(`BEFORE call to ${fn} with args ${args}`);\n  return {\n    onError(result) {\n      console.log(`AFTER call to ${fn} with args ${args} -\u003e result: ${result}`);\n    },\n  };\n};\n\nconst interceptableObj = interceptable(obj, interceptor);\ninterceptableObj.sayHello('Sam');\n\n// OUTPUT:\n// BEFORE call to sayHello with args Sam\n// ... inside sayHello\n// AFTER call to sayHello with args Sam -\u003e result: Hello Sam!\n// (node:26506) UnhandledPromiseRejectionWarning: Error: Cannot say hello to Sam!\n//     at Object.sayHello (/Users/seb/Work/Github/interceptable/manual.js:6:27)\n//     ... \n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fseppevs%2Finterceptable","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fseppevs%2Finterceptable","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fseppevs%2Finterceptable/lists"}