Angular 8 environments 配置

项目在开发时与发布后的配置文件（比如url）是有区别的，因此需要根据不同的场景使用不同的配置。

环境

>ng version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 7.3.3
Node: 10.13.0
OS: win32 x64
Angular: 7.2.6
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.13.3
@angular-devkit/build-angular     0.13.3
@angular-devkit/build-optimizer   0.13.3
@angular-devkit/build-webpack     0.13.3
@angular-devkit/core              7.3.3
@angular-devkit/schematics        7.3.3
@angular/cli                      7.3.3
@ngtools/webpack                  7.3.3
@schematics/angular               7.3.3
@schematics/update                0.13.3
rxjs                              6.3.3
typescript                        3.2.4
webpack                           4.29.0

思路

分别配置两套 Config，dev、prod，之后在发布网站时选择不同的配置项进行发布即可。

配置

打开 angular.json -> projects -> 项目名 -> architect -> build -> configurations -> production。复制该配置以设置更多的配置项，如下：

"configurations": {
  "prod": {
    "fileReplacements": [
      {
        "replace": "src/environments/environment.ts",
        "with": "src/environments/environment.prod.ts"
      }
    ],
    "optimization": true,
    "outputHashing": "all",
    "sourceMap": false,
    "extractCss": true,
    "namedChunks": false,
    "aot": true,
    "extractLicenses": true,
    "vendorChunk": false,
    "buildOptimizer": true,
    "budgets": [
      {
        "type": "initial",
        "maximumWarning": "2mb",
        "maximumError": "5mb"
      }
    ]
  },
  "dev": {
    "fileReplacements": [
      {
        "replace": "src/environments/environment.ts",
        "with": "src/environments/environment.dev.ts"
      }
    ],
    "optimization": true,
    "outputHashing": "all",
    "sourceMap": false,
    "extractCss": true,
    "namedChunks": false,
    "aot": true,
    "extractLicenses": true,
    "vendorChunk": false,
    "buildOptimizer": true,
    "budgets": [
      {
        "type": "initial",
        "maximumWarning": "2mb",
        "maximumError": "5mb"
      }
    ]
  }
}

上面的配置中，配置了 2 个配置项，分别是 dev 与 prod。
dev 与 prod 是配置中节点的名字，随后 build 时需要用到他们。

编辑 dev 与 prod 环境文件

在 src -> environments 中复制 environments.prod.ts， 粘贴后更改名字为 environments.dev.ts。
environment.ts 文件内容：

export const environment = {
  production: false,
  envType: 'test'
};

environment.dev.ts 文件内容：

export const environment = {
  production: false,
  envType: 'dev'
};

environment.prod.ts 文件内容：

export const environment = {
  production: true,
  envType: 'prod'
};

此时的 environments 文件夹应该是这样的
├── environment.dev.ts
├── environment.prod.ts
└── environment.ts

使用配置项

app.component.html：

<h2>{{envType}}</h2>

app.component.ts：

import { Component, OnInit } from '@angular/core';
import { environment } from 'src/environments/environment';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {

  public envType: string;

  constructor() { }

  ngOnInit(): void {
    this.envType = environment.envType;
  }
}

为了方便测试，打开 angular.json -> projects -> 项目名 -> architect -> serve -> configurations 修改如下：

"configurations": {
  "prod": {
    "browserTarget": "ng-practice:build:prod"
  },
  "dev": {
    "browserTarget": "ng-practice:build:dev"
  }
}

分别执行： ng s -c=dev 与 ng s -c=prod 与 ng s，会看到不同的结果：dev, prod, test。

在发布时，需要将命令稍作修改: ng b --prod -c=prod。