angular / angular/angular-cli

Template type checking re-builds do not run correctly when referencing a re-exported type

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area: @ngtools/webpack needs: investigation
主要语言
TypeScript
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描述

### Which @angular/* package(s) are the source of the bug?

Don't known / other

### Is this a regression?

Yes

### Description

Consider the following example, running ng serve with template type checking turned on:

- An Angular template references a property on the component class in an expression.
- This component class properties type definition comes from a file which re-exports the type definition from another file.
- Re-builds do not always re-compile the template expression when they should.

More specifically, in the reproduction repo this looks as follows:

- The app component template includes an expression: `{{ myType?.abc }}`.
- The app component class defines the myType property: `myType?: MyTypeReExported`.
- The type of the myType property comes from a file which re-exports another type. `export type MyTypeRexported = MyType`.
- The type MyType comes from a file which defines the definition as: `export interface MyType { abc: 123; }`.
- The initial ng serve will run without errors.
- Changing the type definition of MyType to be `export interface MyType { abcd: 123; }` causes an error in the app component's template. This is seen in the re-build console output. This is the correct behaviour.
- Changing the type definition back to what it was originally should remove the error. However, it does not. That is the bug.

### Please provide a link to a minimal reproduction of the bug

https://github.com/HazzMan2409/angular-template-rebuild-bug

### Please provide the environment you discovered this bug in

```true
Angular 12.2.5.
Node 14.17.6

See the package.json on the repo for more details. At the time 12.2.5 was the latest version.
```

贡献指南

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调研方向

从链接的最小复现开始,并在所述的 Angular 和 Node 版本上启用模板类型检查运行 ng serve。在 abc 和 abcd 定义之间切换 MyType,然后检查 Angular CLI 重建和模板类型检查路径。恢复类型定义后,如果重建时的模板错误被移除,即表示完成。

由索引模型根据 Issue 内容生成。

评估

技术栈
angular, typescript
领域
build-system
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

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