What are the .map files used for in angular-cli and can ng build not create these files?

Question

ng build of angular-cli creates 3 files:

inline.bundle.js
vendor.bundle.js
main.bundle.js

and also a map file for each own. What for?

I

Answer 1

Below command will not generate the source files while generating the build:

>ng build --prod -sm false

and if you want to generate the source files the use below command:

>ng build --prod -sm true

Here is the screenshot: