严格模式link

Strict modelink

Angular CLI 创建所有新工作区和项目时会弃用严格模式。

Angular CLI creates all new workspaces and projects with strict mode enabled.

严格模式会增强可维护性，并且帮助你捕获各种 AOT 的 BUG。 另外，严格模式的应用还易于进行静态分析，并且当你未来要升级到 Angular 的未来版本时，能帮助 ng update 命令的重构代码更加安全和精确，

Strict mode improves maintainability and helps you catch bugs ahead of time. Additionally, strict mode applications are easier to statically analyze and can help the ng update command refactor code more safely and precisely when you are updating to future versions of Angular.

具体来说， strict 标志执行以下操作：

Specifically, strict mode does the following:

• 在 TypeScript 中启用 strict 模式，以及 TypeScript 团队建议的其他严格性标志。具体而言，包括 forceConsistentCasingInFileNames、noImplicitReturns、noFallthroughCasesInSwitch。

  Enables strict mode in TypeScript, as well as other strictness flags recommended by the TypeScript team. Specifically, forceConsistentCasingInFileNames, noImplicitReturns, noFallthroughCasesInSwitch.

• 打开 Angular 编译器的严格性标志 strictTemplates、strictInjectionParameters和 strictInputAccessModifiers。

  Turns on strict Angular compiler flags strictTemplates, strictInjectionParametersand strictInputAccessModifiers.

• 打包尺寸预算减少了约 75％。

  Bundle size budgets have been reduced by ~75%.

你可以在工作区一级和项目一级应用这些设置。

You can apply these settings at the workspace and project level.

使用基本的 ng new 命令创建新的工作空间和项目时，会自动使用严格模式，命令如下：

Using the basic ng new command to create a new workspace and application automatically uses strict mode, as in the following command:

      
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      ng new [project-name]
    

要在现有的非严格工作区内以严格模式创建新应用程序，请运行以下命令：

To create a new application in the strict mode within an existing non-strict workspace, run the following command:

      
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      ng generate application [project-name] --strict