Project Compiles Twice

[atdiff]

Description

In projects that have arcgis-webpack-plugin, the code gets compiled twice when ran with webpack-dev-server.

Expected Behavior

The code should only compile once.

Actual Behavior

Code is compiling twice (based on receiving two "Compiled successfully" messages) and longer build/serve process.

Possible Fix

I'm wondering if this is more of a dojo-webpack-plugin side effect. When testing with their demo project, the dual compilation occurs. But with projects without the webpack plugins for arcgis or dojo, it doesn't happen.

Steps to Reproduce

1. Used the code from https://github.com/Esri/jsapi-resources/tree/master/4.x/webpack/demo
2. npm install
3. npm start
4. Note in the resulting output that there are two "Compiled successfully" messages

Context

It's more of an annoyance than a big problem. Slows down the build. And when using bundle analysis and build notification plugins, it causes duplications of those tasks.

Your Environment

• Version used: 4.11.0
• Browser Name and version: Chrome Version 75.0.3770.100 (64-bit)
• Operating System and version (desktop or mobile): Windows 10
• Link to your project if available: https://github.com/Esri/jsapi-resources/tree/master/4.x/webpack/demo

[odoe]

This is more of a set up option to provide the prebuilt dojo.js file as described in dojo webpack plugin.