Typescript该如何往Promise实例增加方法

Question

let pr = new Promise((r)=>r(1))
pr.run = function(){
}

现在报错Property 'run' does not exist on type 'Promise<unknown>'
自己是这么定义的不知道对不对

type CustomPromise<T=any> = Promise<T> & {run(): void}
let pr:CustomPromise = new Promise((r)=>r(1)) as CustomPromise
pr.run = function(){
}

哪位老哥能指点下感谢🙏

Answer 1

import typePredicates from 'ts-type-predicates';

let pr = new Promise((r)=>r(1));

typePredicates<typeof pr & {
    run()
}>(pr);

pr.run = function(){
}