Modify Source Webpack Plugin

Webpack plugin that allows modification of module source code during compilation via hook functions. Current version 4.1.0 works with Webpack 4 and 5. It uses webpack loader mechanism internally to transform sources, supporting watch mode re-compilation. Key differentiators: cleaner API compared to using raw loaders for conditional modifications; provides access to module path and source; handles loader option serialization issues internally. Release cadence is ad-hoc with breaking changes between major versions (rejection of global variable in v4). Ships TypeScript definitions.