turn all text to another char function

const replaceAll = (text, char) => {
    if (typeof text != "string" || !text || typeof char != "string" || !char || char.length > 1) return undefined
    else {
        let replaced = ""
        for (let i = 0; i != text.length; i++) {
            replaced += char
        }
        return replaced
    }
}


// example
// code | expected output

replaceAll("foo", "-")    // ---
replaceAll("bar", "-")    // ---
replaceAll("foobar", "-") // ------
                          //
replaceAll("foo", "*")    // ***
replaceAll("bar", "*")    // ***
replaceAll("foobar", "*") // ******