output の設定
参考：
publicPath
参考：
Public Path | Webpack [Official]
Serving webpack built assets from a subdirectory – Stack Overflow
hash
output: {
// ...
hashFunction: 'sha256',
hashDigest: 'hex',
hashDigestLength: 24,
// ...
}
参考：
output.hashFunction – Output | Webpack [Official]
output.hashDigest – Output | Webpack [Official]
output.hashDigestLength – Output | Webpack [Official]
HashedModuleIdsPlugin | Webpack [Official]
entry と output
参考：
The need for multiple output paths? · Issue #1189 · webpack/webpack – GitHub