Similar to disable close on clicking the backdrop, it would be nice to be able to disable closing of the modal by pressing ESC.

As well, could you not use @keyup.esc on the modal div to detect if the ESC key was pressed in while the modal was open (rather than binding the esc key detection on the document element?

<div key="modal" :id="id"
     v-show="visible"
     :class="['modal',{fade :fade}]"
     @click="onClickOut($event)"
     @keyup.esc="onEsc($event)"
>

export default {
  ...
  props {
    ...
    closeOnEsc: { type: Boolean, default: true },
    ...
  },
  methods {
    ...
    onEsc(e) {
      if (this.visible && this.closeOnEsc) {
        this.hide();
      }
    },
    ...
  },
  ...
}