Web Workers with Switch

Using web workers to display out the number of words count, character count keyed in text area. However, I am unable to call a specific string Getting Started as it matches the case type. Should I be using two web workers?

This is my index.js page.

btn.addEventListener("click", function(){
    worker.postMessage("Getting Started");
})

text.addEventListener("keyup", ()=> {
    worker.postMessage(text.value);  
});

Below is my webworker.js file

self.onmessage = function(event) {
    switch(event){
        case event.data === 'Getting Started':
            postMessage("web worker started");
            break;
        case typeof event.data === "string":
            postMessage(analyze(event.data));
            break;
        default:
            postMessage("closing");
            close();
    }
}

//The analyze function 
function analyze(str) {
    const mostRepeatedWordInfo = findMostRepeatedWord(str);
    return {
      wordCount: countWords(str)
      charCount: countChars(str)
    };
  }

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