diff --git a/src/.flowconfig b/src/.flowconfig
index c450f59fe2..4e699a9940 100644
--- a/src/.flowconfig
+++ b/src/.flowconfig
@@ -32,6 +32,7 @@ module.system.haste.paths.blacklist=.*/fbjs/node_modules/.*
 module.system.haste.paths.blacklist=.*/node_modules/invariant/.*
 
 esproposal.class_static_fields=enable
+esproposal.optional_chaining=enable
 suppress_type=$FlowIssue
 suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(2[0-8]\\|1[0-9]\\|[0-9]\\).[0-9]\\)? *\\).*\n
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError