"ng serve" doesn't react on changes in d.ts files.

[fasergeyte]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [ ] build
- [x] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

I found a bug #7638
According to this looks like it worked in angular 5

Description

"ng serve" doesn't react on changes in d.ts files.

🔬 Minimal Reproduction

Precondition:

1. Clone repository: https://github.com/VlasovSergey/angular-ng-serbe-ignores-dts.git

2. run npm install

3. run ng serve

4. comment func: () => void; in file src\typings.ts
   Expected: 'ng serve' runs build and shows an error because module.ts uses function func.
   Actual: 'ng serve' do nothing.

5. re-run ng serve (it shows error).

6. make any change in main.ts but don't fix the error (ng serve rebuild project and show error correctly)

7. uncomment func: () => void; in file src\typings.ts

Expected: ng serve rebuilds the project and the error disappears.
Actual: 'ng serve' do nothing. Moreover, if I trigger ng serve again (by changing main.ts) the error will be still here.

🌍 Your Environment

Angular CLI: 8.3.9
Node: 10.15.1
OS: win32 x64
Angular: 8.2.11
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.9
@angular-devkit/build-angular     0.803.9
@angular-devkit/build-optimizer   0.803.9
@angular-devkit/build-webpack     0.803.9
@angular-devkit/core              8.3.9
@angular-devkit/schematics        8.3.9
@angular/cli                      8.3.9
@ngtools/webpack                  8.3.9
@schematics/angular               8.3.9
@schematics/update                0.803.9
rxjs                              6.4.0
typescript                        3.5.3
webpack                           4.39.2

[filipesilva]

Just a note about this bug: it should be limited to global definitions. When importing the interface from the .d.ts file, rebuilds should still be triggered properly.