Getting error: "Cannot read property 'getDependenciesToBeIncluded' of undefined" after upgrading to v2.10.0

[cato]

Not sure if this is a bug with Rollup or the Post CSS plugin. But it started when I upgraded from Rollup v2.9.0 to v2.10.0, so I'll start here.

Sorry in advance if it should be in the Post CSS Plugin Repo.

• Rollup Version: 2.10.0
• Operating System (or Browser): macOS Catalina
• Node Version (if applicable): 12.6.3
• Link to reproduction (IMPORTANT, read below): https://repl.it/@cato1/PaltryImmediateCopycat

Expected Behavior

After upgrading from 2.9.0 to 2.10.0, Rollup + Post CSS Plugin should build as usual.

Actual Behavior

After upgrading from 2.9.0 to 2.10.0, Rollup + Post CSS Plugin throw this error during build:
TypeError: Cannot read property 'getDependenciesToBeIncluded' of undefined

[lukastaegert]

Thanks for reporting. It appears the bug was actually introduced in 2.9.1. Fix at #3558.

[lukastaegert]

BTW your minimal repro was crucial in finding a fix for that quickly 👍