How To Use an Automator To Convert Text To Title Case?

I’m a new Automator user. Using Automator and a javascript action, I’m attempting to convert the selected text to a Title case in desktop WhatsApp application where the contextual menu with Transformations – capitalize doesn’t show. However, it always comes with the error and posted below. Please assist me in resolving the issue. The following is the Javascript code in detail:
Javascript Code
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function run(input, parameters) {
const patternStyle = /^w|[s.]w/gm;
input = input.replace(patternStyle, element => element.toUpperCase());
return input;
}
Error While Executing
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Execution Error
Error: TypeError: input.replace is not a function. (In ‘input.replace (patternStyle, element E> element.toUpperCase ())’, ‘input.replace’ is undefined)
1. I have set up as a quick action under Automator with Workflow receives current text->in any application and Input is entire selection followed by Output replaces the selected text
2. Automator has only one action and it is Run Javascript Action with the above-posted code
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Kishore Kumar