Source maps blank for src folder when running intern tests in browser

[MarvDann]

When trying to debug unit tests I am unable to see any source maps for all code in the /src folder.
I can see source maps for the unit tests themselves and can set a breakpoint in a unit test but I can't step through the source code.

To reproduce the error....

• clone the realworld app from https://github.com/dojo/examples.git
• install npm dependencies
• run dojo build -m test
• create a file in root called intern.json
• add the following content to intern.json

{
	"environments": [ { "browserName": "chrome" } ],
	"suites": [ "output/test/unit.js" ]
}

-install a http server npm i http-server -g

• serve the root of the project by running http-server (Listens on port 8080 by default)
• In a browser navigate to localhost:8080/node_modules/intern/
• When your tests load open chrome developer tools (F12 or Ctrl + Shift + I)
• Navigate to the sources tab in chrome dev tools
• Navigate to

   webpack://./src/widgets/Tags.ts

• observe blank source map containing

null


// WEBPACK FOOTER //
// ./src/widgets/Tags.ts

[agubler]

@MarvDann Just for future reference, you shouldn't need to create an intern configuration you should be able to run the unit tests using:

http://localhost:[PORT]/node_modules/intern/?config=node_modules/@dojo/cli-test-intern/intern/intern.json@local