WeAreDevelopers Logo WeAreDevelopers
Sign in
For You LIVE
World Congress 2024 • Aug 20, 2024 • Session details

Oh CommonJS! Why are you mESMing with me?

Jolo

Tired of ESM and CommonJS clashes? The JavaScript ecosystem is moving on. Embrace native ECMAScript Modules to slash bundle sizes and eliminate technical debt.

Pause
Mute Enter Fullscreen
#1 about 6 min

Diagnosing unexpected token export errors in Jest test runners

Upgrading dependencies can trigger syntax errors when CommonJS test runners encounter modern ESM-only packages.

#2 about 2 min

Implementing module systems to scale server-side JavaScript execution

Splitting and reusing code becomes necessary as JavaScript execution shifts to complex server environments.

#3 about 3 min

Comparing CommonJS and ECMAScript module syntax and execution behaviors

Synchronous require statements in legacy CommonJS contrast with the asynchronous import standards of modern ECMAScript modules.

#4 about 2 min

Analyzing module system adoption trends across the package ecosystem

Despite most packages relying on older standards, the wider developer ecosystem shows a clear adoption trend toward native modules.

#5 about 5 min

Benchmarking execution speed and bundle size across module systems

Effective tree shaking makes bundled ECMAScript modules significantly smaller and faster to execute than CommonJS equivalents.

#6 about 6 min

Migrating legacy toolchains to native ECMAScript standard environments

Transitioning workflows to native modules and modern alternatives like Vitest eliminates ongoing legacy compatibility overhead.

Matching moments

5:14 min

Addressing production environments, module tests, and ecosystem compatibility

Daniel Roe · JS Congress

4:20 min

JavaScript runtime competition and built-in features

2:28 min

Expected features and performance defaults in modern JavaScript frameworks

Sasha Shynkevich · LIVE

3:47 min

Embracing composable architecture within the modular JavaScript framework ecosystem

Josh Goldberg · JS Congress

3:49 min

Evolution and dominance of full stack JavaScript ecosystems

Michael Bromley · World Congress 2022

3:06 min

Backward compatibility issues between CommonJS and ES6 modules

Priscila Oliveira · World Congress 2023

More from World Congress 2024

Beyond the Hype: Real-World AI Strategies Panel thumbnail
24:07
12 months ago

Beyond the Hype: Real-World AI Strategies Panel

Mike Butcher, Jürgen Müller, Katrin Lehmann, Tobias Regenfuss

Carl Lapierre - Exploring Advanced Patterns in Retrieval-Augmented Generation thumbnail
21:17
almost 2 years ago

Carl Lapierre - Exploring Advanced Patterns in Retrieval-Augmented Generation

Carl Lapierre

Coding an Immersive Copilot using Unity / .NET and Azure OpenAI! thumbnail
31:50
about 2 years ago

Coding an Immersive Copilot using Unity / .NET and Azure OpenAI!

Zaid Zaim

Building a diverse tech company: The power of Diversity, Equity, Inclusion, and Belonging thumbnail
29:43
about 2 years ago

Building a diverse tech company: The power of Diversity, Equity, Inclusion, and Belonging

Sue Quackenbush

Dapr in Practice thumbnail
24:08
about 2 years ago

Dapr in Practice

marcklefter

Minimising the Carbon Footprint of Workloads thumbnail
27:46
about 2 years ago

Minimising the Carbon Footprint of Workloads

Michael Mueller

Upcoming sessions on this topic

Open session

World Congress 2026 North America

September 25, 2026 · 16:15–16:25

Outdoor Stage

Silent Execution: Defending Against Install-Time Supply Chain Attacks

Chris DeMars

Senior Developer Advocate at TuxCare

Chris DeMars
Open session

World Congress 2026 North America

September 24, 2026 · 16:50–17:20

Stage 1

When Humans Stop Writing Code: Rethinking Languages, Compilers, and Responsibility

Simon Auer

Organizer of flutter vienna meetup and CEO of marqably

Simon Auer
Open session

World Congress 2026 North America

September 25, 2026 · 12:20–12:50

Stage 7

Testing React Backends Like a Pro: Mocking Databases with SQLite

David Morris

Solution Architect at Leidos

David Morris
Open session

World Congress 2026 North America

September 25, 2026 · 11:00–11:30

Stage 7

Beyond Vibe Coding: An AI Builder’s Guide to Migrating 10k+ React Components

Shubham Chaurasia

Senior Software Engineer at Meta

Shubham Chaurasia
Open session

World Congress 2026 North America

September 24, 2026 · 13:30–14:00

Stage 4

One Repo, One Strategy: Scalable Full-Stack Testing in a Monorepo World

Bartosz Leczycki, Paweł Matynia

Bartosz Leczycki
Paweł Matynia
Open session

World Congress 2026 North America

September 24, 2026 · 11:40–12:10

Stage 3

Stop Running Mystery Meat in Production

Jeroen van Erp

Technology Advocate @ SUSE

Jeroen van Erp

Related videos

The 2025 State of JavaScript Testing thumbnail
28:33
World Congress 2025 • about 1 year ago

The 2025 State of JavaScript Testing

Daniel Afonso

The Eternal Sunshine of the Zero Build Pipeline thumbnail
50:10
JS Congress • almost 5 years ago

The Eternal Sunshine of the Zero Build Pipeline

Tree Shaking the Bytes Away thumbnail
27:40
about 2 years ago

Tree Shaking the Bytes Away

Francesco Novy

JavaScript the Grumpy Parts thumbnail
46:08
JS Congress • almost 5 years ago

JavaScript the Grumpy Parts

Rob Richardson

Stop using Node.js like in 2020! What changed and what you can do today with Node.js thumbnail
28:22
World Congress 2026 Europe • 3 months ago

Stop using Node.js like in 2020! What changed and what you can do today with Node.js

Alfonso Graziano

How to Stop Choosing JavaScript Frameworks and Start Living thumbnail
43:57
LIVE • over 5 years ago

How to Stop Choosing JavaScript Frameworks and Start Living

Sasha Shynkevich

Related articles

From learning to earning

Jobs that call for the skills explored in this talk.