Learning TypeScript

TypeScript includes, by default, a file named lib.d.ts that provides interface declarations for the built-in JavaScript library as well as the DOM.

Mocha is a popular JavaScript testing library that facilitates the creation of test suites, test cases, and test specs. Mocha can be used to test TypeScript in the frontend and backend, identify performance issues, and generate different types of test reports, among many other features.

Istanbul is a tool that identifies which lines of our application are processed during the execution of the automated test. It can generate reports known as test coverage reports. These

Karma is a test runner. We will use Karma to automatically execute our tests.

Configuration testing: This is used to determine the effects of configuration changes on the performance and behavior of an application.

Spike testing: This is also similar to the stress test, but instead of using an extreme time load during an extended time period, it uses sudden intervals of extreme and expected load.

Soak testing: This is also known as endurance testing. This kind of test is similar to the stress test, but instead of using an extreme load, it uses the expected load for an extended period of time. It is a common practice to collect memory usage data during this kind of test to detect potential memory leaks.

Stress testing: This is normally used to understand the maximum capacity limits of an application. This kind of test determines if an application is able to handle an extreme load by using an extreme load for an extended period of time.

Load testing: This is the most basic form of performance testing. We can use a load test to understand the behavior of the system under a specific expected load

RequireJS: RequireJS uses a syntax known as asynchronous module definition (AMD)
Browserify: Browserify uses a syntax known as CommonJS.
SystemJS: SystemJS is a universal module loader, which means that it supports all the available module syntaxes (ES6, CommonJS, AMD, and UMD).
Note

Node.js applications also use the CommonJS syntax.