<span class="type">
  <span>Some text here</span>
</span>

.type {
  font-size:50px;
  display:inline-flex;
  border:2px solid red;
}

.type span {
  height:1.2em;
  width:0%;
  word-break:break-all;
  overflow: hidden;
  border:2px solid green;
  animation:t 2s linear infinite alternate;
}
.type span:before {
  content:" ";
  display:inline-block;
}

@keyframes t{
  90%,100% {width:100%}
}