Vue textarea autosize

<template>
	<div>
    	<textarea
          ref="text-input"
          v-model="text"
          :style="{
            height: textareaHeight
          }"
          rows="1"
          @input="onTextInput"
        />
    </div>
</template>

<script lang="ts">

@Component
export default class App extends Vue {
  textareaHeight = ''
  text = ''
  minTextareaHeight = 40

  onTextInput() {
      this.$nextTick(() => {
        this.textareaHeight = 'auto'

        this.$nextTick(() => {
          const comp = this.$refs['text-input'] as HTMLTextAreaElement | undefined

          if (comp) {
            const scrollHeight = comp.scrollHeight

            let newHeight: number

            if (scrollHeight >= this.minTextareaHeight) {
              newHeight = scrollHeight
            } else {
              newHeight = this.minTextareaHeight
            }

            this.textareaHeight = `${newHeight}px`
          }
        })
      })
   }
}
</script>

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