Integrating Source Maps in Node.js Applications

require('source-map-support').install();

This line of code integrates the 'source-map-support' module which enables source map support for stack traces in Node.js applications. This module uses source maps to map error stack traces from the generated code back to the original source code. The 'install()' method must be called as early as possible in the application, preferably as the first line of the entry file.

throw new Error('Test error with source map');

This line is an example of throwing an error. When an error is thrown, and if 'source-map-support' is installed correctly, Node.js will output a stack trace that maps back to the original source files instead of the transpiled or bundled code, making debugging much easier.