title: Vue 3 - Typescript - Object is possibly null issue
body: <p>I checked other threads but couldn't find the solution.</p>
  <pre><code>setup() {
    const processingData = ref(null)
  }
  </code></pre>
  <p>Function:</p>
  <pre><code>function create() {
    let field = JSON.parse(processingData.value.fields)
  
    for (let i = 0; i &lt; field.length; i++) {
      console.log(i)
    }
  }
  </code></pre>
  <p>Error on JSON.parse(processingData.value.fields): <code>Object is possibly 'null'.Vetur(2531) const processingData: Ref&lt;null&gt;</code></p>
  <p>processingData is 100% accessable, as It's being set with another function already.</p>