Why is the "then" property automatically accessed on an object returned from an async function?

When an object is returned from an asynchronous function something automatically accesses the .then property of that object. Why does this happen?

//Use a proxy to monitor property access of an object, warn if property accessed is "then"
const createProxiedPerson = person => new Proxy(person, {
  get: function(target, property, receiver) {
    const value = Reflect.get(target, property, receiver)
    if (property === "then") console.log({ target, property, receiver })
    return value
  }
})

const getPersonAfterLoadingVideos = async person => {
  //person.videos = await fetch.....
  return createProxiedPerson(person)
}

getPersonAfterLoadingVideos({ name: "Bill", videoCategory: "funny cats", age: 45 })

170 thoughts on “Why is the "then" property automatically accessed on an object returned from an async function?”

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