Description
Describe the bug
After upgrading the react-scripts package from 4.0.3 to 5.0.0, the react-scripts build command only produces a single JavaScript file, where previously there were 3 files. Because of this, the resulting .js.map file is too large for us to version-control.
Did you try recovering your dependencies?
I have run the commands side-by-side in different copies of our source repository and confirmed that the RS 5.0.0 code is not producing comparable results to 4.0.3. In both trees, I was running against a clean re-install of all dependencies (removed node_modules and re-ran yarn install).
Which terms did you search for in User Guide?
I searched for "code splitting" and read the section on it. It implies that code-splitting is based on dynamic imports (which we are not using), but the application code itself has not changed (only the build tools).
Environment
Environment Info:
current version of create-react-app: 5.0.0
running from /home/rjray/.npm/_npx/20562/lib/node_modules/create-react-app
System:
OS: Linux 4.15 Ubuntu 16.04.7 LTS (Xenial Xerus)
CPU: (12) x64 Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
Binaries:
Node: 14.18.3 - /home/linuxbrew/.linuxbrew/opt/node@14/bin/node
Yarn: 1.22.0 - /home/linuxbrew/.linuxbrew/bin/yarn
npm: 6.14.15 - /home/linuxbrew/.linuxbrew/opt/node@14/bin/npm
Browsers:
Chrome: 96.0.4664.93
Firefox: 88.0
npmPackages:
react: ^16.14.0 => 16.14.0
react-dom: ^16.14.0 => 16.14.0
react-scripts: ^5.0.0 => 5.0.0
npmGlobalPackages:
create-react-app: Not Found
Steps to reproduce
I'm not sure how to describe reproducing the problem, and I cannot share the project's package.json file as it is an internal company project.
Expected behavior
I expected it to behave identically to the 4.0.3 toolchain.
Actual behavior
When I run react-scripts build on the repo that has version 4.0.3, the resulting build/static/js directory looks like this:
$ ls -lG build/static/js
total 7400
-rw-r--r-- 1 rjray 1289088 Jan 19 09:11 2.1e43ba39.chunk.js
-rw-r--r-- 1 rjray 3423 Jan 19 09:11 2.1e43ba39.chunk.js.LICENSE.txt
-rw-r--r-- 1 rjray 5081380 Jan 19 09:11 2.1e43ba39.chunk.js.map
-rw-r--r-- 1 rjray 314529 Jan 19 09:11 main.38d92359.chunk.js
-rw-r--r-- 1 rjray 868002 Jan 19 09:11 main.38d92359.chunk.js.map
-rw-r--r-- 1 rjray 1559 Jan 19 09:11 runtime-main.5f8120df.js
-rw-r--r-- 1 rjray 8278 Jan 19 09:11 runtime-main.5f8120df.js.map
When I run the repo with the 5.0.0 toolchain, the resulting directory looks like this:
$ ls -lG build/static/js
total 6836
-rw-r--r-- 1 rjray 1484759 Jan 19 10:47 main.7f057cb8.js
-rw-r--r-- 1 rjray 2160 Jan 19 10:47 main.7f057cb8.js.LICENSE.txt
-rw-r--r-- 1 rjray 5508473 Jan 19 10:47 main.7f057cb8.js.map
Reproducible demo
I cannot, as this is an internal company application.