我正在创建一个应用程序，但有一个时刻，他给了我以下错误：“并非所有代码路径都返回值”。错误出现在函数名称（addValues）中，说明函数必须返回“Obj[]|未定义”。
按照下面的代码块：

public addValues() {

        const inputValue = document.getElementById('valor') as HTMLFormElement;

        const inputNameValue = 
        document.getElementById('nome-valor') as HTMLFormElement;

        const enterChecked = document.getElementById('entrada') as HTMLFormElement;
        const leftChecked = document.getElementById('saida') as HTMLFormElement;

        if (inputValue?.length && inputNameValue?.length && (enterChecked.checked || leftChecked.checked)) {
            const list: Obj = {
                id: Math.random(),
                valor: +inputValue,
                nomeValor: String(inputNameValue),
                checked: enterChecked.checked ? enterChecked : leftChecked
            }

            if (this.valores == undefined) {
                return undefined
            }

            return this.valores = [list]
        }