Bug: Error when selecting a date property in card view

[sbishel]

Summary:
When selecting a date property in card view you receive a page that simply states

"Something went wrong."

Javascript error "Cannot read property 'localeData' of undefined"

Steps to reproduce the behavior:

1. Go to any card.
2. Create a new Date Property
3. Click on "Empty" to load the day picker.
4. See error

Expected behavior:
Day Picker is loaded successfully.

Screenshots:

Platform:

• Browser and version: Chrome 92
• OS and version: macOS 11.4

Additional context:

[sbishel]

This has something with the way are doing new builds for plugins, checked the prior commit and it works. It works fine with Personal Server.

When building mattermost-plugin, make dist. A warning is displayed -

WARNING in ../../webapp/node_modules/react-day-picker/src/moment.js 1:0-73
export 'MomentLocalUtils' (reexported as 'default') was not found in './addons/MomentLocaleUtils' (possible exports: default, formatDate, formatDay, formatMonthTitle, formatWeekdayLong, formatWeekdayShort, getFirstDayOfWeek, getMonths, parseDate)
 @ ../../webapp/node_modules/react-day-picker/build/addons/MomentLocaleUtils.js
 @ ../../webapp/node_modules/react-day-picker/moment/index.js 1:0-61
 @ ../../webapp/src/widgets/editableDayPicker.tsx 30:33-67
 @ ../../webapp/src/components/propertyValueElement.tsx 35:44-83
 @ ../../webapp/src/components/kanban/kanbanCard.tsx 19:47-81
 @ ../../webapp/src/components/kanban/kanban.tsx 35:37-60
 @ ../../webapp/src/components/centerPanel.tsx 24:33-59
 @ ../../webapp/src/components/workspace.tsx 11:38-62
 @ ../../webapp/src/pages/boardPage.tsx 14:36-70
 @ ../../webapp/src/app.tsx 35:36-64
 @ ./src/index.tsx 32:30-64

100% of time, if the warning is displayed during build, the error will occur.

Commenting out this line, gets around error, so definitely related to 'MomentLocaleUtils'
https://github.com/mattermost/focalboard/blob/main/webapp/src/components/properties/dateRange/dateRange.tsx#L234

Can also be replicated using existing EditableDatePicker.