Function setupHmrWsOptionCompat

packages/vite/src/node/utils.ts:1363–1402

(
  serverConfig: Pick<ServerOptions, 'hmr' | 'ws'>,
)

})()

export function setupHmrWsOptionCompat(
  serverConfig: Pick<ServerOptions, 'hmr' | 'ws'>,
): void {
  if (serverConfig.hmr === false || serverConfig.ws === false) {
    return
  }
  if (serverConfig.hmr === true) {
    serverConfig.hmr = {}
  }

  const hmrConfig = serverConfig.hmr
  const wsConfig = serverConfig.ws ? { ...serverConfig.ws } : {}
  if (hmrConfig) {
    for (const key of wsOptionKeys) {
      if (hmrConfig[key] !== undefined) {
        // @ts-expect-error same value for same key
        wsConfig[key] ??= hmrConfig[key]
      }
    }
  }
  serverConfig.ws = wsConfig

  const hmrProxy = hmrConfig || {}
  for (const key of wsOptionKeys) {
    Object.defineProperty(hmrProxy, key, {
      get() {
        return (serverConfig.ws as Record<string, unknown>)?.[key]
      },
      set(newValue) {
        hmrWsOptionsDeprecationCall()
        if (typeof serverConfig.ws === 'object') {
          ;(serverConfig.ws as Record<string, unknown>)[key] = newValue
        }
      },
      configurable: true,
      enumerable: true,
    })
  }
  serverConfig.hmr = hmrProxy
}

function mergeConfigRecursively(
  defaults: Record<string, any>,