Balancing CSS minification and source map precision in PostCSS

PostCSS utilizes an Abstract Syntax Tree (AST) to transform CSS through a sequential pipeline of plugins. In low-traffic or small-scale workloads, reducing build-time resource consumption often involves optimizing the plugin chain to minimize memory overhead during AST traversal.

A conflict arises when implementing aggressive minification plugins alongside source map generation. While minification reduces the final bundle size, the process of collapsing whitespace and optimizing selectors can complicate the mapping between the transformed output and the original source files, potentially degrading debugging accuracy.

Technical Constraints

• Requirement to maintain readable source maps for production debugging.
• Goal to minimize memory heap usage during the build process.
• Dependence on sequential plugin execution where minification typically occurs last.

Which configuration strategy best preserves source map precision without sacrificing the resource savings provided by aggressive minification plugins? Does the order of source map generation relative to AST-altering plugins impact the final mapping accuracy?