// Global
import Vue from 'vue';
import VueCropper from 'vue-cropperjs';
import 'cropperjs/dist/cropper.css';
Vue.component(VueCropper);

// Local
import VueCropper from 'vue-cropperjs';
import 'cropperjs/dist/cropper.css';
export default {
  components: { VueCropper}
}

...
<vue-cropper
  ref="cropper"
  :src="imgSrc"
  alt="Source Image"
  @ready="..."
  @cropstart="..."
  @cropmove="..."
  @cropend="..."
  @crop="..."
  @zoom="..."
>
</vue-cropper>
...

this.$refs.cropper.rotate(45);