ifdef-loader

Webpack loader that adds conditional compilation directives (`#if`, `#elif`, `#else`, `#endif`) inside JavaScript or TypeScript comments, processed at build time. Current stable version is 2.3.2 (last released on npm), with no fixed release cadence; the project appears to be in maintenance mode with infrequent updates. Key differentiators: directives are written inside triple-slash comments so they don't interfere with normal parsing or linters; supports nested conditions, arbitrary JS expressions, and an uncomment-prefix feature to hide syntactically invalid code in comments. Comparable to `preprocessor-loader` or manual environment-based code stripping.