how to translation ifdef syntax in rspack

[kibuniverse]

For historical reasons, my project heavily uses ifdef syntax and use loader similar to ifdef in conjunction with webpack. now i want to migrate to rspack. However, I've found that rspack doesn't seem to easily support this scenario. I'm seeking help.

// #ifdef H5
export function printPlatform() {
  console.log('now is H5 platform');
}
// #endif

// #ifdef PC
export function printPlatform() {
  console.log('now is PC platform');
}
// #endif

[kibuniverse]

the question has been sloved. becase my scene is simple. so i write a simple custom loader to solve the question

/**
 *  Conditional Loader
 */
module.exports = function (source, context) {
  const options = context || {};

  const regex = /\/\/\s*#ifdef\s+([A-Z0-9_| ]+)[\r\n]+([\s\S]*?)\/\/\s*#endif/g;

  const result = source.replace(regex, (match, expression, content) => {
    const keys = expression.split('||').map(s => s.trim());

    const isMatched = keys.some(key => !!options[key]);

    if (isMatched) {
      return content;
    }
    return '';
  });

  return result;
};