Deprecate imports from 'flipper'

Summary: It is quite easy to miss some flipper imports, this lint rule makes them more visible. In the future we can eventually turn this into an error.

Reviewed By: jknoxville

Differential Revision: D28027118

fbshipit-source-id: 817b356634cb78b11b9216ce45429ea7a22f0e4f

desktop/.eslintrc.js

@@ -76,6 +76,14 @@ module.exports = {
         property: 'remote',
       },
     ],
+    'no-restricted-imports': [
+      1,
+      {
+        name: 'flipper',
+        message:
+          "Direct imports from 'flipper' are deprecated. Import from 'flipper-plugin' instead, which can be tested and distributed stand-alone. See https://fbflipper.com/docs/extending/sandy-migration for more details.",
+      },
+    ],
 
     // additional rules for this project
     'header/header': [2, 'block', {pattern}],