Add types for which

Summary:
Used by

src/dispatcher/androidDevice.tsx
src/chrome/DevicesButton.tsx

Reviewed By: jknoxville

Differential Revision: D17204335

fbshipit-source-id: 40fa266d7301d2ddceea8b884f26b3e4741d7797

package.json

@@ -94,6 +94,7 @@
     "@types/react-transition-group": "^4.2.2",
     "@types/redux-devtools-extension": "^2.13.2",
     "@types/rsocket-tcp-server": "^0.0.2",
+    "@types/which": "^1.3.1",
     "JSONStream": "^1.3.1",
     "adbkit-fb": "2.10.1",
     "ansi-to-html": "^0.6.3",

yarn.lock

@@ -1305,6 +1305,11 @@
   dependencies:
     "@types/node" "*"
 
+"@types/which@^1.3.1":
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/@types/which/-/which-1.3.1.tgz#7802c380887986ca909008afea4e08025b130f8d"
+  integrity sha512-ZrJDWpvg75LTGX4XwuneY9s6bF3OeZcGTpoGh3zDV9ytzcHMFsRrMIaLBRJZQMBoGyKs6unBQfVdrLZiYfb1zQ==
+
 "@types/yargs@^12.0.2", "@types/yargs@^12.0.9":
   version "12.0.12"
   resolved "https://registry.yarnpkg.com/@types/yargs/-/yargs-12.0.12.tgz#45dd1d0638e8c8f153e87d296907659296873916"