fix: avoid bailout of webpack module concatenation (#1230)

Webpack's module concatenation support was broken by v15 due to this `module.exports` line. Changing to ESM export fixes this issue.

lib/loaders/pitcher.js

@@ -37,8 +37,7 @@ module.exports.pitch = function (remainingRequest) {
  ...beforeLoaders
  ])
  // console.log(request)
- // use cjs to ensure exports from (vue-)style-loader/css-loader are intact
- return `module.exports = require(${request})`
+ return `import mod from ${request}; export default mod; export * from ${request}`
  }
  }
 
@@ -66,5 +65,5 @@ module.exports.pitch = function (remainingRequest) {
  // both that rule and the cloned rule will match, resulting in duplicated
  // loaders. Therefore it is necessary to perform a dedupe here.
  const request = genRequest(loaders.map(toLoaderString))
- return `module.exports = require(${request})`
+ return `import mod from ${request}; export default mod; export * from ${request}`
 }