Simple animated input typewriter

typewriter.js

        let speed = 100;
        let input = document.getElementById('searchInput');
        let i = 0;
        let j = 0;
        let texts = [
            'Macbook Pro',
            'iPhone 11 Pro',
            'lorem ipsum im silor daler ipsilom'
        ];
        let text = texts[j];

        const typeWriter = function(){
            return new Promise((resolve, reject) => {
                let wait = setTimeout(() => {
                    clearTimeout(wait);
                    let content = input.getAttribute('placeholder') + text.charAt(i);
                    input.setAttribute('placeholder', content);
                    i++;
                }, speed)
                return resolve();
            });
        }

        function init(){
            if(j === texts.length) j = 0;
            text = texts[j];
            input.setAttribute('placeholder', '');
            i = 0;
            j++;

            let writeInterval = setInterval(() => {
                if(input === document.activeElement){
                    i = 0;
                    input.setAttribute('placeholder', '');
                    return;
                }
                typeWriter().then(() => {
                    if(i===text.length){
                        setTimeout(() => {
                            clearInterval(writeInterval);
                            init();
                        }, 1000)
                    }
                });
            }, speed)
        }

        init();