Ionic 3中的环境特定参数

Question

以何种方式使用与离子命令行界面一起使用的环境特定参数ionic build android --prod --device,以便根据环境(例如生产和开发)对javascript/typescript代码进行区分？

我应该用process.env.IONIC_ENV吗？或者我可以通过哪种方式查询这种区别？

Answer 1

根据Rob Ferguson的教程,有三件事要做.取决于您的文件结构是完全可互换的(./标记应用程序的根目录).

./tsconfig.json

{
  "compilerOptions": {
    "baseUrl": "./src",
    "paths": {
      "@env": [ "env/env" ]
    },
    ...
  }
  ...
}

./package.json

{
  "config": {
    "ionic_source_map_type": "source-map",
    "ionic_webpack": "./config/webpack.config.js"
  },
  ...
}

./config/webpack.config.js (取决于ionic_webpack你的package.json)

/*
 * The webpack config exports an object that has a valid webpack configuration
 * For each environment name. By default, there are two Ionic environments:
 * "dev" and "prod". As such, the webpack.config.js exports a dictionary object
 * with "keys" for "dev" and "prod", where the value is a valid webpack configuration
 * For details on configuring webpack, see their documentation here
 * https://webpack.js.org/configuration/
 */

const path = require('path');
// If you start your building process with the flag --prod this will equal "prod" otherwise "dev"
const ENV = process.env.IONIC_ENV;

const devConfig = {
  entry: ...,
  output: {...},
  devtool: ...,
  resolve: {
    extensions: [...],
    modules: [...],
    alias: {
      // this distincts your specific environment "dev" and "prod"
      "@env": path.resolve(`./src/env/env.ts`),
    }
  },
  module: {...},
  plugins: [...],
  node: {...}
};

const prodConfig = {
  entry: ...,
  output: {...},
  devtool: ...,
  resolve: {
    extensions: [...],
    modules: [...],
    alias: {
      // this distincts your specific environment "dev" and "prod"
      "@env": path.resolve(`./src/env/env.prod.ts`),
    }
  },
  module: {...},
  plugins: [...],
  node: {...}
};

module.exports = {
  dev: devConfig,
  prod: prodConfig
}

说明

魔术带来了devConfig.resolve.alias和prodConfig.resolve.alias.这行代码创建了一个可导入的别名,如您自己的模块或节点模块.现在可以注入import { ENV } from '@env'任何模块,组件,服务,管道或任何你喜欢的东西.

注意

不要忘记创建特定于环境的文件.在这个例子中,你需要一个像这样的文件结构:

./
|   package.json
?   tsconfig.json    
?
??? config
?       webpack.config.js
?   
??? src
    ?
    ??? env
            env.ts        (dev environment variables)
            env.prod.ts   (prod environment variables)

示例文件

./src/env/env.ts (默认情况下是开发)

export const ENV = {
  production: false,
  isDebugMode: true
};

./src/env/env.prod.ts

export const ENV = {
  production: true,
  isDebugMode: false
};