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Fallback Development Workflow

The Calypso build has two outputs: evergreen, for browsers that are always kept up to date aka "evergreen"; and fallback, for all other browsers.

Build

Running yarn start-fallback will do the "fallback" build of all the code and continuously watch the front-end JS and CSS/Sass for changes and rebuild accordingly.

You may need to run yarn clean between evergreen and fallback debug sessions.

Debugging with Internet Explorer

If you aren't running Windows, it's possible to run the fallback build in IE using a free VM.

1. Install Microsoft's testing VM

Install Virtual Box and grab a copy of Microsoft’s testing VM for IE and legacy Edge.

This is a Windows image that can be used for development and testing purposes. The password for the VM is on the download page.

2. Edit hosts file

The VM's network uses NAT mode by default, which means the host machine is accessible at 10.0.2.2 (this is the Virtual Box default).

  1. Launch the VM
  2. Open the Start menu and search for "Notepad"
  3. Right-click Notepad and "Run as administrator"
  4. Use the "File" menu to open C:\Windows\System32\drivers\etc\hosts (you may need to change the "Text Documents" filter to "All Files")
  5. Add a 10.0.2.2 calypso.localhost entry and save.

3. View in IE

Run yarn start-fallback on the host machine. Open Internet Explorer in the your VM (you'll need to search using the Start menu because Edge is the default browser) and navigate to calypso.localhost:3000.