TypeError: req.flash is not a function

[MrRowey]

TypeError: req.flash is not a function
at allFailed (/code/node_modules/passport/lib/middleware/authenticate.js:131:15)
at attempt (/code/node_modules/passport/lib/middleware/authenticate.js:180:28)
at Strategy.strategy.fail (/code/node_modules/passport/lib/middleware/authenticate.js:302:9)
at loaded (/code/node_modules/passport-openidconnect/lib/strategy.js:83:21)
at SessionStore.verify (/code/node_modules/passport-openidconnect/lib/state/session.js:71:11)
at Strategy.authenticate (/code/node_modules/passport-openidconnect/lib/strategy.js:254:24)
at attempt (/code/node_modules/passport/lib/middleware/authenticate.js:366:16)
at authenticate (/code/node_modules/passport/lib/middleware/authenticate.js:367:7)
at Layer.handle [as handle_request] (/code/node_modules/express/lib/router/layer.js:95:5)
at next (/code/node_modules/express/lib/router/route.js:137:13)

Context: flash used to be a function to show a flash message after an activity.
E.g. you login with wrong password you get redirected to login with a flash messages telling you login failed.
But for some reason these flash method is suddenly not existing anymore and it seems it was moved to a different package