Developer experience, often shortened to DX, describes what it is like to work with a tool, platform or codebase. It includes finding the right information, making a change, understanding feedback and recovering when something fails.
Look at a real task
Consider changing a form label. Can a new contributor find the source, run the preview, understand the error and verify the output? A fast build helps, but undocumented setup and vague failures can still make the task difficult.
An editor’s autocomplete is one part of this experience. Clear naming, predictable scripts, useful documentation and a reviewable diff matter too.
Inspect the friction
Try the task from the documented starting point. Record the steps, waiting time and places where you needed unstated knowledge. Distinguish environment setup from the everyday edit-and-check loop. A confusing first run and a slow repeated build call for different fixes.
Improve one bottleneck
Write down a reliable command, make an error name the missing prerequisite, or reduce an unnecessary manual step. Verify the improvement with the same task. Do not assume a popular tool automatically makes every team more productive.
For this reference site, complete copied examples are a DX choice: they make the dependency boundary visible. See good front-end code and development tools for related decisions.
Sources
Reference 1 Reference 2 provide the technical details and current compatibility information.