ESlint - Parsing error: Unexpected token for class private function

Question

I got Parsing error: Unexpected token for below class's _processMessage (private function). i am using babel and eslint ("babel-eslint", "babel-cli", "babel-core", "babel-preset-env", "babel-plugin-add-module-exports", "eslint", "eslint-config-google").

Error is 6:9 error Parsing error: Unexpected token _processMessage

class MyWorker {
  constructor(c) {
    super(c);
  }

  async _processMessage(message) {
    console.log(message);
    await someFunction();
  }
}