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

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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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