rich-harris/magic-string

MagicString is a lightweight utility for making precise string manipulations while generating accurate sourcemaps, designed for developers who need to modify code without losing formatting or comments. It's particularly useful for build tools, compilers, or any application that requires transforming source code and maintaining debuggability through sourcemaps. The library works in both Node.js and browser environments and provides methods for replacing, inserting, and moving text while tracking changes for sourcemap generation.