Build creates 2.[hash].chunk.js instead of 1.[hash].chunk.js

Created by: robcaldecottvelo

Is this a bug report?

Yes

Did you try recovering your dependencies?

This is not a dependency issue.

Which terms did you search for in User Guide?

"chunk"

Environment

  System:
    OS: macOS 10.14.3
    CPU: x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
  Binaries:
    Node: 11.12.0 - /usr/local/bin/node
    Yarn: 1.15.2 - /usr/local/bin/yarn
    npm: 6.7.0 - /usr/local/bin/npm
  Browsers:
    Chrome: 73.0.3683.86
    Firefox: 65.0.1
    Safari: 12.0.3
  npmPackages:
    react: Not Found
    react-dom: Not Found
    react-scripts: Not Found
  npmGlobalPackages:
    create-react-app: Not Found

Steps to Reproduce

We are upgrading from react-scripts 2.1.1 which used to generate a files called 1.[hash].chunk.js and 1.[hash].chunk.css. This has now changed to 2.[hash].chunk.*. While this would not be an issue for most, we are integrating with some legacy code where we are expecting 1.[hash].chunk.* to be present.

Note that 2.[hash].chunk.* contradicts the official docs here:

https://facebook.github.io/create-react-app/docs/production-build#docsNav

Create a new app via create-react-app
Run npm build or yarn build
Observe that 2.[hash].chunk.js is created instead of 1.[hash].chunk.js

Expected Behavior

We expected 1.[hash].chunk.js

Actual Behavior

Production build JS files are not named correctly.