Assertion testing in Node.js serves several important purposes, particularly in the context of software development and quality assurance. Assertions are a way to perform checks within your code to verify that something is true at a particular point in the program. If the assertion fails (i.e., the condition evaluates to false), the program can throw an error or halt execution, depending on how the assertion is handled.
Async Hooks are crucial for debugging, monitoring, profiling, and managing the context across asynchronous logic. The module allows developers to hook into the initialization, execution, and destruction phases of asynchronous operations, which is particularly useful in a runtime that heavily relies on non-blocking I/O operations.
Asynchronous context tracking is crucial in Node.js due to its non-blocking, event-driven nature, where callbacks, Promises, and async/await patterns are commonly used to handle I/O-bound operations without freezing the main thread. Ensuring that the context of an operation is preserved across these asynchronous boundaries is important for a variety of reasons, such as logging, tracing, and managing transactions or security-related tasks.
Features in node.js (v 21.7.1)