Create .flowconfig

.flowconfig

@@ -1,14 +1,26 @@
-[ignore]
-
-[include]
-
-[libs]
+[options]
+; Check all files, not just those with @flow comments
+all=true
+; Enable IDE autocomplete for imports
+autoimports=true
+; Treat object types as exact by default
+exact_by_default=true
+; Include warnings in the error output
+include_warnings=true
+; Improve performance on large codebases
+lazy_mode=true
 
 [lints]
+; Warn about potentially unsafe null checks
+sketchy-null=warn
+; Throw an error if a type import is untyped
 untyped-type-import=error
-internal-type=error
-deprecated-type-bool=error
-
-[options]
 
 [strict]
+nonstrict-import
+sketchy-null-number
+sketchy-null-string
+sketchy-null-mixed
+unclear-type
+untyped-import
+untyped-type-import