为什么在 Node.js 代码中使用 import 和 require()？

Question

I am reading the source code at "Type definitions for Express 4.16" and found this funny line (#18):

import serveStatic = require("serve-static");

Since import is the new way to work with modules in ES6, why above code is used or needed at all?

Answer 1

Type definitions for Express 4.16 is written(index.d.ts) in typescript, Where import = require() is a TypeScript Syntax

TypeScript - Modules (export = and import = require())

The export = syntax specifies a single object that is exported from the module. This can be a class, interface, namespace, function, or enum.

When exporting a module using export = , TypeScript-specific import module = require("module") must be used to import the module .

Reference : Modules