Webstorm shows deprecation error in postMessage function of a web worker

When writing something like this in web storm:

let webWorker = new Worker('...') ... webWroker.postMessage(...)

The postMessage is striked out with the following message:
"Deprecated symbol used, consult docs for better alternative"
"Checks for using deprecated JavaScript functions and variables ..."
Is postMessage function of the webWorker is deprecated?