my package.json file and the node-sass can't be installed in my pc

{
"name": "kiosque",
"version": "1.0.0",
"nativescript": {
"id": "cd.fabiyo.kiosque",
"tns-android": {
"version": "6.0.1"
}
},
"author": "iyongofabrice@gmail.com",
"dependencies": {
"nativescript-theme-core": "^2.0.4",
"nativescript-vue": "^2.4.0",
"tns-core-modules": "~6.0.3"
},
"devDependencies": {
"@babel/core": "~7.5.5",
"@babel/preset-env": "~7.5.5",
"babel-loader": "~8.0.6",
"nativescript-dev-webpack": "^1.0.2",
"nativescript-vue-template-compiler": "~2.4.0",
"vue-loader": "~15.7.1"
}
}

when I execute tns run android, everything is ok but when I modif a file, app.vue I have as result
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> CreateElement(NativeFrame)'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> CreateElement(NativePage)'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> CreateElement(NativeActionBar)'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> CreateElement(nativenavigationbutton)'
JS: [Vue warn]: Invalid handler for event "tap": got undefined
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> AppendChild(ElementNode(nativeactionbar), ElementNode(nativenavigationbutton))'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> AppendChild(ElementNode(nativepage), ElementNode(nativeactionbar))'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> CreateElement(nativestacklayout)'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> CreateElement(nativelabel)'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> AppendChild(ElementNode(nativestacklayout), ElementNode(nativelabel))'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> AppendChild(ElementNode(nativepage), ElementNode(nativestacklayout))'
JS: '{NSVue (Vue: 2.6.10 | NSVue: 2.4.0)} -> AppendChild(ElementNode(nativeframe), ElementNode(nativepage))'
JS: HMR: The following modules were updated:
JS: HMR: ↻ ../node_modules/babel-loader/lib/index.js!../node_modules/vue-loader/lib/index.js?!./components/App.vue?vue&type=script&lang=js&
JS: HMR: ↻ ./components/App.vue?vue&type=script&lang=js&
JS: HMR: ↻ ./components/App.vue
JS: HMR: Successfully applied update with hmr hash 07fe74e64a8aa4904377. App is up to date.
Refreshing application on device 192.168.193.101:5555...
Successfully synced application cd.fabiyo.kiosque on device 192.168.193.101:5555.

but the changement is not appliqued on the emulator !!!