Opting into Angular Ivy

选用 Angular Ivy ['aɪvɪ]（常春藤）

Ivy is the code name for Angular's next-generation compilation and rendering pipeline. Starting with Angular version 8, you can choose to opt in to start using a preview version of Ivy and help in its continuing development and tuning.

To preview Ivy, use @angular/core@next version of Angular (8.1.x), rather than @angular/core@latest (8.0.x), as it contains all the latest bug fixes and improvements.

Ivy 是 Angular 下一代编译和渲染管道的代号。从 Angular 的版本 8 开始，你就可以开始选用 Ivy 了，以帮助它继续开发和调优。

Using Ivy in a new project

在新项目中使用 Ivy

To start a new project with Ivy enabled, use the --enable-ivy flag with the ng new command:

要启动基于 Ivy 的新项目，可以在 ng new 命令中使用 --enable-ivy 标志：

ng new shiny-ivy-app --enable-ivy

The new project is automatically configured for Ivy. Specifically, the enableIvy option is set to true in the project's tsconfig.app.json file.

这个新项目已经自动为 Ivy 配置好了。具体来说就是在项目的 tsconfig.app.json 文件中，enableIvy 选项已设置为 true 。

Using Ivy in an existing project

在现有项目中使用 Ivy

To update an existing project to use Ivy, set the enableIvy option in the angularCompilerOptions in your project's tsconfig.app.json.

要让现有项目使用 Ivy，请在项目的 tsconfig.app.json 中的 angularCompilerOptions 中设置 enableIvy 选项。

{
  "compilerOptions": { ... },
  "angularCompilerOptions": {
    "enableIvy": true
  }
}

AOT compilation with Ivy is faster and should be used by default. In the angular.json workspace configuration file, set the default build options for your project to always use AOT compilation.

{
  "projects": {
    "my-existing-project": {
      "architect": {
        "build": {
          "options": {
            ...
            "aot": true,
          }
        }
      }
    }
  }
}

To stop using the Ivy compiler, set enableIvy to false in tsconfig.app.json, or remove it completely. Also remove "aot": true from your default build options if you didn't have it there before.

要停止使用 Ivy 编译器，请在 enableIvy 中把 tsconfig.app.json 设置为 false ，或者把它完全删除。

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