magic-string is a JavaScript utility for manipulating strings with surgical precision. It's particularly useful for source code transformation and manipulation tasks like minification or transpilation. Instead of directly modifying the original string, magic-string tracks changes, allowing you to accurately map modified content back to its original location and generate source maps. It provides methods for inserting, removing, and overwriting portions of a string, and can efficiently handle overlapping edits, ensuring you can transform code with confidence.