npm i foo

interface Todo {
  Todo.title: stringtitle: string
}

const const todo: Readonly<Todo>todo: type Readonly<T> = { readonly [P in keyof T]: T[P]; }
Make all properties in T readonlyReadonly<Todo> = {
  
title: stringtitle: 'Delete inactive users'.String.toUpperCase(): string
Converts all the alphabetic characters in a string to uppercase.toUpperCase(),
}

const todo: Readonly<Todo>todo.title = 'Hello'
Cannot assign to 'title' because it is a read-only property.

var Number: NumberConstructor
An object that represents a number of any kind. All JavaScript numbers are 64-bit floating-point numbers.Number.p
parseFloat
parseInt
prototypeNumberConstructor.parseInt(string: string, radix?: number): number
Converts A string to an integer.
@paramstring A string to convert into a number.@paramradix A value between 2 and 36 that specifies the base of the number in `string`.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.arseInt('123', 10)



var window: Window & typeof globalThis
[MDN Reference](https://developer.mozilla.org/docs/Web/API/Window/window)window.
function setTimeout(handler: TimerHandler, timeout?: number, ...arguments: any[]): number (+2 overloads)
[MDN Reference](https://developer.mozilla.org/docs/Web/API/setTimeout)setTimeout



        //

const const a: 1a = 1
Custom log message
const const b: 1b = 1
Custom error message
const const c: 1c = 1
Custom warning message
Custom annotation message

console.log('hewwo')
console.log('hello')
console.log('goodbye')

import { useEffect } from 'react';
import '@/styles/global.css';

const MyApp = ({ pageProps }) => {
  useEffect(() => {
    document.title = 'hello world';
  }, []);
  return <Component {...pageProps} />;
};

export default MyApp;