我在离子应用程序中安装了 cordova电源管理插件。按照用法指导“ https://ionicframework.com/docs/native/power-management#installation enter link description here”，我按如下所示导入类：
import { PowerManagement } from '@ionic-native/power-management/ngx';
但是，在构建此离子应用程序时，出现错误：
找不到模块'@ ionic-native / power-management / ngx'
为什么会出现此错误？如何解决？
我尝试通过删除ngx模块导入类，然后错误消失：
import { PowerManagement } from '@ionic-native/power-management';
我的package.json文件是：
{
"name": "ionicapp",
"version": "0.0.1",
"author": "Ionic Framework",
"homepage": "http://ionicframework.com/",
"private": true,
"scripts": {
"start": "ionic-app-scripts serve",
"clean": "ionic-app-scripts clean",
"build": "ionic-app-scripts build",
"lint": "ionic-app-scripts lint"
},
"dependencies": {
"@angular/animations": "5.2.11",
"@angular/common": "5.2.11",
"@angular/compiler": "5.2.11",
"@angular/compiler-cli": "5.2.11",
"@angular/core": "^5.2.11",
"@angular/forms": "5.2.11",
"@angular/http": "5.2.11",
"@angular/platform-browser": "5.2.11",
"@angular/platform-browser-dynamic": "5.2.11",
"@angular/router": "^6.1.9",
"@ionic-native/background-geolocation": "^4.16.0",
"@ionic-native/background-mode": "^4.20.0",
"@ionic-native/ble": "^4.12.0",
"@ionic-native/bluetooth-serial": "^4.12.2",
"@ionic-native/camera": "4.3.3",
"@ionic-native/core": "^4.12.2",
"@ionic-native/geolocation": "^4.12.0",
"@ionic-native/google-maps": "^4.12.0",
"@ionic-native/launch-navigator": "^4.15.0",
"@ionic-native/native-storage": "^4.12.0",
"@ionic-native/network": "^4.12.2",
"@ionic-native/network-interface": "^4.12.2",
"@ionic-native/power-management": "^4.20.0",
"@ionic-native/splash-screen": "~4.11.0",
"@ionic-native/sqlite": "^4.12.2",
"@ionic-native/status-bar": "^4.11.0",
"@ionic/storage": "^2.1.3",
"@ngx-translate/core": "8.0.0",
"@ngx-translate/http-loader": "^2.0.0",
"@types/google-maps": "^3.2.0",
"@types/googlemaps": "^3.30.12",
"an": "0.0.8",
"angularfire2": "^5.0.2",
"chart.js": "^2.7.2",
"cordova-android": "7.1.0",
"cordova-plugin-actionsheet": "^2.3.3",
"cordova-plugin-background-mode": "git+https://github.com/tushe/cordova-plugin-background-mode.git",
"cordova-plugin-ble-central": "^1.2.2",
"cordova-plugin-bluetooth-serial": "^0.4.7",
"cordova-plugin-compat": "^1.2.0",
"cordova-plugin-device": "^2.0.2",
"cordova-plugin-dialogs": "^2.0.1",
"cordova-plugin-geolocation": "^4.0.1",
"cordova-plugin-googlemaps": "^2.4.2",
"cordova-plugin-ionic-keyboard": "^2.1.2",
"cordova-plugin-ionic-webview": "^2.1.0",
"cordova-plugin-mauron85-background-geolocation": "^3.0.0-alpha.43",
"cordova-plugin-nativestorage": "^2.3.2",
"cordova-plugin-network-information": "^2.0.1",
"cordova-plugin-networkinterface": "^2.0.0",
"cordova-plugin-powermanagement-orig": "^1.1.2",
"cordova-plugin-splashscreen": "^5.0.2",
"cordova-plugin-statusbar": "^2.4.2",
"cordova-plugin-whitelist": "^1.3.3",
"cordova-sqlite-storage": "^2.4.0",
"firebase": "^5.5.3",
"ionic-angular": "3.9.2",
"ionic-native": "4.1.1",
"ionicons": "3.0.0",
"ng2-charts": "^1.6.0",
"rxjs": "5.5.11",
"sw-toolbox": "3.6.0",
"uk.co.workingedge.phonegap.plugin.launchnavigator": "^4.2.2",
"zone.js": "0.8.26",
"at.gofg.sportscomputer.powermanagement": "~1.1.2"
},
"devDependencies": {
"@ionic/app-scripts": "^3.2.0",
"@mauron85/cordova-plugin-background-geolocation": "^3.0.0-alpha.4",
"typescript": "~2.6.2"
},
"description": "An Ionic project",
"cordova": {
"plugins": {
"cordova-plugin-ble-central": {},
"cordova-plugin-whitelist": {},
"cordova-plugin-device": {},
"cordova-plugin-splashscreen": {},
"cordova-plugin-ionic-webview": {},
"cordova-plugin-ionic-keyboard": {},
"cordova-plugin-geolocation": {
"GEOLOCATION_USAGE_DESCRIPTION": "To locate you"
},
"cordova-plugin-mauron85-background-geolocation": {
"GOOGLE_PLAY_SERVICES_VERSION": "11+",
"ANDROID_SUPPORT_LIBRARY_VERSION": "23+",
"ALWAYS_USAGE_DESCRIPTION": "App requires background tracking enabled",
"MOTION_USAGE_DESCRIPTION": "App requires motion detection"
},
"cordova-plugin-nativestorage": {},
"cordova-sqlite-storage": {},
"cordova-plugin-statusbar": {},
"cordova-plugin-bluetooth-serial": {},
"cordova-plugin-network-information": {},
"cordova-plugin-networkinterface": {},
"uk.co.workingedge.phonegap.plugin.launchnavigator": {
"OKHTTP_VERSION": "3.+"
},
"cordova-plugin-background-mode": {},
"at.gofg.sportscomputer.powermanagement": {}
},
"platforms": [
"android"
]
}
}
答案 0 :(得分：2)
如果您的Angular版本为> = 6
，请使用 ngx您似乎使用了错误的插件版本。请按照以下步骤纠正错误
在ionic.config.json文件中检查您的项目类型。
如果类型为“离子角”，则安装4版本。
ionic cordova plugin add cordova-plugin-powermanagement-orig
npm install @ionic-native/power-management@4
如果类型为“角度”，则安装最新版本
ionic cordova plugin add cordova-plugin-powermanagement-orig
npm install @ionic-native/power-management
注意：
仅在使用Angular 6或6+时在导入结束时添加 ngx
import { PowerManagement } from '@ionic-native/power-management/ngx';
如果未同时从app.module.ts和app.component.ts中的导入中删除ngx
import { PowerManagement } from '@ionic-native/power-management';
参考：https://github.com/ionic-team/ionic/issues/15225#issuecomment-414074074