📦 Node.js – Module Scope & Module Wrapper Function

What is Module Scope?

In Node.js, each file is treated as a separate module with its own scope. This means that variables declared inside one module are not accessible in another module unless they are explicitly exported.

What is Module Wrapper Function?

Behind the scenes, Node.js does not run our code directly. Instead, it wraps the entire code inside a function before execution. This function is called the Module Wrapper Function. It ensures that variables declared inside a module are scoped to that module only.

Node.js automatically wraps each module's code inside a function. This provides module scope and prevents variable name conflicts across modules.

(function (exports, require, module, __filename, __dirname) {
   // module code
});