What type of value is returned by setTimeout in ts, isn't it Timer?

let timeoutId: Timer = setTimeout(() => {
    console.log("ok");
}, 250);

vscode prompts that there is no Timer type, but if I replace Timer with number, he prompts me that the Timer type returned by setTimeout cannot be assigned to the number type

in the tsconfig of the root directory of the ant component, there is an attribute: "

lib": [
    "dom",
    "es7"
]

what are these two for? do they have anything to do with the questions I asked? For beginners of ts, please give me a lot of advice

< hr >

Javascript typescript vue.js react.js

May.14,2021

delete @ types/node dependency
if not, use window.setTimeout

should be number type

is number type, but your setTimeout and setInterval should be called with window.setTimeout and window.setInterval, you can use

var timeoutID = window.setTimeout (func, delay, [param1, param2,.]);

returns an ID, that is a positive integer.

window.setTimeout

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