Modules and Code Organization

ES Modules Mastery

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LearnStep 1 of 3

Modern Modularity with ES Modules

Learning Objectives

•Master the syntax for named exports and imports to selectively share code.
•Understand default exports and when to prefer them over named exports.
•Learn to re-export functionality to create clean, aggregated public APIs.
•Comprehend module resolution basics and file path conventions.

Lesson Outline

LearnStep 1/3

Modern Modularity with ES Modules

ECMAScript Modules (ESM) provide the official standard format to package JavaScript code for reuse. ESM allows for static analysis, enabling optimizations like tree-shaking.

Named Exports

Named exports allow a module to share multiple functions or variables. You must import them using the exact same name (or alias them).

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Default Exports

A module can have one default export. This is often used for the main class or function of a file.

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Re-exports

You can re-export modules to simplify imports for consumers, often done in an index.js (barrel file).

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