Karma tests: measure coverage for untested code

IMPORTANT:

This answer will not solve the above problem, it's fundamentally wrong. See comments.

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NYC supports coverage for untested code with --all flag. Assuming your test command in package.json is

"test": "karma start karma.conf.js",

You can test coverage after npm install -D nyc ts-node, you can add the following command and run it. This command expects the source code to check for coverage to be in src directory.

"coverage": "nyc --all --include src --extension .ts --require ts-node/register npm test",

• --all flag is used to check all files for coverage.
• --extension .ts is for checking all TypeScript files, you can add more extension like --extension .ts --extension .tsx.
• --include src is for the directory to check for coverage.
• -- require ts-node/register is to teach NYC to understand TypeScript.

After that you should see all .ts files being included.

Note: Using ts-node/register may cause issues with line numbers on reports. To solve this you will probably need to register source map support as well..