SHELL

TypeError: lookups.flatMap is not a function

npm install -g gulp@3.9.1
npm install -g yo@3.1.0

TypeError: lookups.flatMap is not a function

+-- @microsoft/generator-sharepoint@1.11.0
+-- gulp@4.0.2
+-- npm@6.14.12
+-- windows-build-tools@5.2.2
-- yo@4.0.0

TypeError: lookups.flatMap is not a function

npm uninstall -g gulp
npm uninstall -g yo

TypeError: lookups.flatMap is not a function

yo @microsoft/sharepoint

TypeError: lookups.flatMap is not a function

gulp serve