How to implement debounce in Vue2?

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I have a simple input box in a Vue template and I would like to use debounce more or less like this:

<input type="text" v-model="filterKey" debounce="500">

However the debounce property has been deprecated in Vue 2. The recommendation only says: “use v-on:input + 3rd party debounce function”.

How do you correctly implement it?

I’ve tried to implement it using lodash, v-on:input and v-model, but I am wondering if it is possible to do without the extra variable.

In template:

<input type="text" v-on:input="debounceInput" v-model="searchInput">

In script:

data: function () {
  return {
    searchInput: '',
    filterKey: ''
  }
},

methods: {
  debounceInput: _.debounce(function () {
    this.filterKey = this.searchInput;
  }, 500)
}

The filterkey is then used later in computed props.

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