Repository: vitejs/vite
File: packages/vite/src/node/plugins/optimizedDeps.ts (TypeScript)

Code before:
            // This is an entry point, it may still not be bundled
            await info.processing
          } catch {
            // If the refresh has not happened after timeout, Vite considers
            // something unexpected has happened. In this case, Vite
            // returns an empty response that will error.
            throwProcessingError(id)
          }
          const newMetadata = depsOptimizer.metadata
          if (metadata !== newMetadata) {
            const currentInfo = optimizedDepInfoFromFile(newMetadata!, file)
            if (info.browserHash !== currentInfo?.browserHash) {
              throwOutdatedRequest(id)
            }
          }
        }
        debug?.(`load ${colors.cyan(file)}`)
        // Load the file from the cache instead of waiting for other plugin
        // load hooks to avoid race conditions, once processing is resolved,
        // we are sure that the file has been properly save to disk
        try {
          return await fsp.readFile(file, 'utf-8')
        } catch {
          const newMetadata = depsOptimizer.metadata
          if (optimizedDepInfoFromFile(newMetadata, file)) {
            // Outdated non-entry points (CHUNK), loaded after a rerun
            throwOutdatedRequest(id)
          }
          throwFileNotFoundInOptimizedDep(id)
        }
      }
    },
  }
}

function throwProcessingError(id: string): never {
  const err: any = new Error(
    `Something unexpected happened while optimizing "${id}". ` +
      `The current page should have reloaded by now`,
  )
  err.code = ERR_OPTIMIZE_DEPS_PROCESSING_ERROR
  // This error will be caught by the transform middleware that will
  // send a 504 status code request timeout
  throw err
}

export function throwOutdatedRequest(id: string): never {
  const err: any = new Error(
    `There is a new version of the pre-bundle for "${id}", ` +
      `a page reload is going to ask for it.`,
  )

Review comment (performance):
The simplified logic using `browserHash` is cleaner than the previous approach that checked metadata. This directly correlates the presence of a browser hash with outdated files, making the code more readable and maintainable.
```suggestion
            // Check current metadata for browserHash mismatch before throwing outdated error
            const currentMetadata = depsOptimizer?.metadata
            const currentInfo = currentMetadata ? optimizedDepInfoFromFile(currentMetadata, file) : undefined
            if (currentInfo && currentInfo.browserHash !== browserHash) {
              throwOutdatedRequest(id)
            }
```

Code after:
            // This is an entry point, it may still not be bundled
            await info.processing
          } catch {
            // If the refresh has not happened after timeout, Vite considers
            // something unexpected has happened. In this case, Vite
            // returns an empty response that will error.
            throwProcessingError(id)
          }
          const newMetadata = depsOptimizer.metadata
          if (metadata !== newMetadata) {
            const currentInfo = optimizedDepInfoFromFile(newMetadata!, file)
            if (info.browserHash !== currentInfo?.browserHash) {
              throwOutdatedRequest(id)
            }
          }
        }
        debug?.(`load ${colors.cyan(file)}`)
        // Load the file from the cache instead of waiting for other plugin
        // load hooks to avoid race conditions, once processing is resolved,
        // we are sure that the file has been properly save to disk
        try {
          return await fsp.readFile(file, 'utf-8')
        } catch {
          if (browserHash) {
            // Outdated optimized files loaded after a rerun
            throwOutdatedRequest(id)
          }
          throwFileNotFoundInOptimizedDep(id)
        }
      }
    },
  }
}

function throwProcessingError(id: string): never {
  const err: any = new Error(
    `Something unexpected happened while optimizing "${id}". ` +
      `The current page should have reloaded by now`,
  )
  err.code = ERR_OPTIMIZE_DEPS_PROCESSING_ERROR
  // This error will be caught by the transform middleware that will
  // send a 504 status code request timeout
  throw err
}

export function throwOutdatedRequest(id: string): never {
  const err: any = new Error(
    `There is a new version of the pre-bundle for "${id}", ` +
      `a page reload is going to ask for it.`,
  )
  err.code = ERR_OUTDATED_OPTIMIZED_DEP