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How Promise.resolve to resolve “then object”?

This is my code:

var pr = Promise.resolve( {
then:function(resolve,reject) {
setTimeout( () => {
reject(new TypeError('myError'));
resolve('run');
},2000)
}
})


I don't know ,what is priority in run?

guesse 1 :

step1 : at first, setTimeout is executed and returns promise with result myError for then method.

setTimeout

promise

myError

then

step2 : then method returns same Promise for resolve method.

then

Promise

resolve

guesse 2 :

step1 : Promise.resolve( returns Promise that,its then method changes to:

Promise.resolve(

Promise

then

function(resolve,reject) {
setTimeout( () => {
reject(new TypeError('myError'));
resolve('run');
},2000)
}


step2 : Finally pr.then(function(....){}) produce result.

pr.then(function(....){})

I do not know how it works and what my guess is right.

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