Ionic 2 Warnings : [Bourbon][Deprecation] - ionic-framework

Question

I run the cmd :
ionic serve
and my app runs perfectly. But I have something like 50 warnings on [Bourbon][Deprecation].The warnings are like this :
WARNING: [Bourbon] [Deprecation] `justify-content` is deprecated and will be removed in 5.0.0. We suggest using an autom
ated prefixing tool, like Autoprefixer.
Backtrace:
node_modules/bourbon/app/assets/stylesheets/_bourbon-deprecate.scss:10, in mixin `-bourbon-deprecate`
node_modules/bourbon/app/assets/stylesheets/_bourbon-deprecate.scss:17, in mixin `-bourbon-deprecate-for-prefixi
ng`
node_modules/bourbon/app/assets/stylesheets/css3/_flex-box.scss:239, in mixin `justify-content`
src/theme/common/inputs/rating.scss:16, in mixin `rating-item-styles`
src/pages/maps/maps.scss:213
So what is the problem? How to fix it?
I'm using ionic 2 angular 2
I have this :
"dependencies": {
"#angular/common": "2.2.1",
"#angular/compiler": "2.2.1",
"#angular/compiler-cli": "2.2.1",
"#angular/core": "2.2.1",
"#angular/forms": "2.2.1",
"#angular/http": "2.2.1",
"#angular/platform-browser": "2.2.1",
"#angular/platform-browser-dynamic": "2.2.1",
"#angular/platform-server": "2.2.1",
"#ionic/storage": "1.1.7",
"#types/googlemaps": "^3.26.2",
"bourbon": "^4.3.3",
"ionic-angular": "2.0.0-rc.5",
"ionic-native": "2.2.11",
"ionicons": "3.0.0",
"rxjs": "5.0.0-beta.12",
"sw-toolbox": "3.4.0",
"zone.js": "0.6.26"
},

Answer 1

You dont actually require Bourbon with Ionic 2 as the default build stack here uses Autoprefixer.
If for any reason you are still using it, check the changelog.All the mixins will be removed in version 5. For the current version, you can try:
$output-bourbon-deprecation-warnings: false;
#import "bourbon";
as mentioned here.
If you choose not to upgrade, you can reduce pollution of your logs by
disabling the output of Bourbon’s deprecation-related Sass warnings.
This variable must be declared before importing Bourbon.