make xplat lints explicit

Summary: Turn on xplat warnings individually rather than all at once. This makes it easier for the team to add new lints that we don't necessarily want to enable globally.

Reviewed By: panagosg7

Differential Revision: D13993571

fbshipit-source-id: 019f301f584be268fdcbf5b0540f63ce6fcd54e3

.flowconfig

@@ -75,19 +75,17 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 [lints]
-all=warn
-unnecessary-optional-chain=off
-
-# There is an ESLint rule for this
-unclear-type=off
-
-sketchy-null=off
 sketchy-null-number=warn
 sketchy-null-mixed=warn
-
-# This is noisy for now. We *do* still want to warn on importing types
-# from untyped files, which is covered by untyped-type-import
-untyped-import=off
+sketchy-number=warn
+untyped-type-import=warn
+nonstrict-import=warn
+deprecated-type=warn
+unsafe-getters-setters=warn
+inexact-spread=warn
+unnecessary-invariant=warn
+deprecated-call-syntax=warn
+signature-verification-failure=warn
 deprecated-utility=error
 
 [strict]

.flowconfig.android

@@ -75,19 +75,17 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 [lints]
-all=warn
-unnecessary-optional-chain=off
-
-# There is an ESLint rule for this
-unclear-type=off
-
-sketchy-null=off
 sketchy-null-number=warn
 sketchy-null-mixed=warn
-
-# This is noisy for now. We *do* still want to warn on importing types
-# from untyped files, which is covered by untyped-type-import
-untyped-import=off
+sketchy-number=warn
+untyped-type-import=warn
+nonstrict-import=warn
+deprecated-type=warn
+unsafe-getters-setters=warn
+inexact-spread=warn
+unnecessary-invariant=warn
+deprecated-call-syntax=warn
+signature-verification-failure=warn
 deprecated-utility=error
 
 [strict]