{"id":284,"date":"2016-03-31T21:41:43","date_gmt":"2016-03-31T21:41:43","guid":{"rendered":"http:\/\/fluentreports.com\/blog\/?p=284"},"modified":"2016-04-01T00:23:16","modified_gmt":"2016-04-01T00:23:16","slug":"nativescript-enabling-beta-android-v8-features","status":"publish","type":"post","link":"https:\/\/fluentreports.com\/blog\/?p=284","title":{"rendered":"NativeScript: Enabling beta android v8 features"},"content":{"rendered":"

\"nv8\"<\/a>One of the interesting things about the v8 engine is there is a lot of development going on behind the scenes that you can actually enable right now.\u00a0 This is supported in NodeJS, Chrome, and yes even NativeScript.<\/p>\n

Currently v8 for NativeScript 1.7 Android is running on v4.7.80 -- \u00a0 So because this is fairly old; a lot of the ES6 code has not been exposed to the engine. \u00a0 As NativeScript adopts the newer v8 engines, most of the ES6 functionality should start becoming available by default. \u00a0\u00a0 However if you are inpatient, you can enable this in your own NativeScript application.\u00a0 Please note; some of the functionality might work perfectly; but some of it might be very buggy; that is why it is behind feature flags.<\/p>\n

To enable functionality; you need to open the \"package.json\" folder in your \"app\" folder; it typically will look like this:
\n

{\n  "name": "tns-template-hello-world",\n  "main": "app.js",\n  "version": "1.7.0",\n  "author": {\n    "name": "Telerik",\n    "email": "support@telerik.com"\n  },\n  "description": "Nativescript hello-world project template",\n  "license": "Apache-2.0",\n  "keywords": [\n    "telerik",\n    "mobile",\n    "nativescript",\n    "{N}",\n    "tns",\n    "appbuilder",\n    "template"\n  ],\n  "repository": {\n    "type": "git",\n    "url": "git:\/\/github.com\/NativeScript\/template-hello-world.git"\n  },\n  "bugs": {\n    "url": "https:\/\/github.com\/NativeScript\/template-hello-world\/issues"\n  },\n  "homepage": "https:\/\/github.com\/NativeScript\/template-hello-world",\n  "android": {\n    "v8Flags": "--expose_gc"\n  },\n  "readme": "ERROR: No README data found!",\n  "_id": "tns-template-hello-world@1.7.0",\n  "_from": "tns-template-hello-world@1.7.0"\n}<\/pre>
\nYes, this is the STOCK 1.7.0 hello world template definition.\u00a0\u00a0\u00a0\u00a0 Do you see about 5 lines up the package.json from the bottom?<\/p>\n
\"android\": {<\/strong>
\n\u00a0 \"v8Flags\": \"--expose_gc\"
\n<\/strong>}<\/strong><\/p>\n
Well, that is where you would add your flags; !!!WARNING!!! DO NOT REMOVE the --expose_gc <\/strong>if you remove it, your app will crash when NS attempts to manually do garbage collection.\u00a0 So, trust me when I say, do not remove it!<\/p>\n
So some of the flags you can add and use are:<\/p>\n