npm i angular-cdnify

const ngCDN = require("angular-cdnify");
ngCDN.updateBasePath("index.html", "https://mycdn.example.com/some-folder/");

Note: The index.html file should contain the placeholder pattern text {[BASE_PATH]}.
This placeholder pattern text will get replaced with the cdnURL provided as the second argument to the updateBasePath function.

e.g.: <base href="{[BASE_PATH]}" />

After invoking updateBasePath from the above example, the index.html file will be updated as below:
<base href="https://mycdn.example.com/some-folder/" />