None of the string methods modify this – they always return fresh strings.
charAt(pos: number): string ES1
Returns the character at index pos, as a string (JavaScript does not have a datatype for characters). str[i] is equivalent to str.charAt(i) and more concise (caveat: may not work on old engines).
The package that linked you here is now pure ESM. It cannot be require()'d from CommonJS.
This means you have the following choices:
import foo from 'foo' instead of const foo = require('foo') to import the package. You also need to put "type": "module" in your package.json and more. Follow the below guide.await import(…) from CommonJS instead of require(…).
This reference guide shows how to configure a TypeScript Node.js project to work and compile to to native ESM.
CommonJS module system was introduced by the Node.js developers due to the lack of the notion of "modules" in the original JavaScript (ECMAScript) language specification at that time. However, nowadays, ECMAScript has a standard module system called ESM — ECMAScript Modules, which is a part of the accepted standard. This way CommonJS could be considered vendor-specific and obsolete/legacy. Hopefully, TypeScript ecosystem now supports the "new" standard.
So the key benefits are:
