Angular cleaning up build files?

Angular generates a lot of trash from a .ts file.

app.component.js
app.component.spec.js.map
app.component.js.map
app.component.spec.ts
app.component.spec.js


Is there any simple way to delete of that, a lot of build systems support clean,

make clean
git clean


How do you do this in angular

My test case.

1. Download Angular's Hero Demo toh-3
2. Unzip it
3. Jump into the directory
4. Run npm install
5. Run npm start

Now from the main.ts you now have main.js and main.js.map

In my own project, where I'm working along with the angular-cli, I actually have .spec files too.

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