nyc-config-typescript

Handy default configuration for instrumenting your TypeScript-backed
project with test coverage using nyc.

First install the dependencies:

npm i -D nyc source-map-support ts-node @istanbuljs/nyc-config-typescript

Your tsconfig.json must be configured to produce source maps, either inline or as sibling files.

.nycrc

And write a .nycrc that looks like this:

 {
    "extends": "@istanbuljs/nyc-config-typescript",
    // OPTIONAL if you want coverage reported on every file, including those that aren't tested:
    "all": true
}

This package specifies the cache, exclude, and extension options for you - only override those if you absolutely must.
If you are going to modify include or exclude and you have specified a separate outDir in tsconfig.json, make sure that it remains included so that source mapping is possible.

Running Tests

If you're using mocha

In test/mocha.opts:

--require ts-node/register #replace with ts-node/register/transpile-only if you have custom types
--require source-map-support/register
--recursive
<glob for your test files>

Now setup the test scripts in your package.json like so (with the equivalent for your test runner):

 {
    "test": "tsc && nyc mocha"
}

If you're using Jasmine

In package.json:

 {
    "test": "tsc && nyc --require ts-node/register jasmine"
}

License

ISC