Update react-native init's flowconfig

Summary:
Fixes #19766

On a clean project flow was complaining about `Cannot resolve module X` because of the removal of `providesModule`. This resolves the errors.

Reviewed By: rubennorte

Differential Revision: D8500303

fbshipit-source-id: 4e129ee4382f8ff36ab126e9f6c6530254cd382e

Author: elicwhite

local-cli/templates/HelloWorld/_flowconfig

@@ -30,6 +30,19 @@ node_modules/react-native/flow-github/
 emoji=true
 
 module.system=haste
+module.system.haste.use_name_reducers=true
+# get basename
+module.system.haste.name_reducers='^.*/\([a-zA-Z0-9$_.-]+\.js\(\.flow\)?\)$' -> '\1'
+# strip .js or .js.flow suffix
+module.system.haste.name_reducers='^\(.*\)\.js\(\.flow\)?$' -> '\1'
+# strip .ios suffix
+module.system.haste.name_reducers='^\(.*\)\.ios$' -> '\1'
+module.system.haste.name_reducers='^\(.*\)\.android$' -> '\1'
+module.system.haste.name_reducers='^\(.*\)\.native$' -> '\1'
+module.system.haste.paths.blacklist=.*/__tests__/.*
+module.system.haste.paths.blacklist=.*/__mocks__/.*
+module.system.haste.paths.blacklist=<PROJECT_ROOT>/node_modules/react-native/Libraries/Animated/src/polyfills/.*
+module.system.haste.paths.whitelist=<PROJECT_ROOT>/node_modules/react-native/Libraries/.*
 
 munge_underscores=true