Unit-testing my learning of Typescript and Node.js.

See https://dev.to/jmfayard/unit-test-your-knowledge-13j

## What is in?

[Chai](https://www.chaijs.com/)

- [Expect / Should - Chai](https://www.chaijs.com/api/bdd/)

[Mocha - the fun, simple, flexible JavaScript test framework](https://mochajs.org/)

Libraries

- [jsdom/jsdom: A JavaScript implementation of various web standards, for use with Node.js](https://github.com/jsdom/jsdom)
- [gcanti/fp-ts: Functional programming in TypeScript](https://github.com/gcanti/fp-ts)
- [Introduction - fp-ts](https://gcanti.github.io/fp-ts/)
- [pluralize  -  This module uses a pre-defined list of rules, applied in order, to singularize or pluralize a given word. There are many cases where this is useful, such as any automation based on user input.](https://www.npmjs.com/package/pluralize)
- [showdown  -  Showdown is a Javascript Markdown to HTML converter](https://www.npmjs.com/package/showdown)
- [lodash  -  A modern JavaScript utility library delivering modularity, performance & extras. Exposes many useful methods on JavaScript arrays, objects and other data structures.](https://www.npmjs.com/package/lodash)

[Node.js v14.17.0 Documentation](https://nodejs.org/dist/latest-v14.x/docs/api/index.html)

- [Process](https://nodejs.org/dist/latest-v14.x/docs/api/process.html)
- [HTTP](https://nodejs.org/dist/latest-v14.x/docs/api/http.html)
- [File system](https://nodejs.org/dist/latest-v14.x/docs/api/fs.html)
- [Child process](https://nodejs.org/dist/latest-v14.x/docs/api/child_process.html)

[TypeScript: Handbook - The TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/intro.html)

- [Narrowing](https://www.typescriptlang.org/docs/handbook/2/narrowing.html)
- [Object Types](https://www.typescriptlang.org/docs/handbook/2/objects.html)
- [Everyday Types](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html)
- [TypeScript - Arrays - Tutorialspoint](https://www.tutorialspoint.com/typescript/typescript_arrays.htm)