Lint for british spelling

Summary:
I hate when I have to comment on a diff and tell somebody to please not use
Her Majesty's Spelling, so I'll let the computer do the shouting.

Mixing two ways of spelling the same thing just isn't fun. I had to
work with an Android library that insisted on spelling it `colour`,
leading to awkward code like `colour: COLORS.BLUE` which is just annoying
and hard to remember.

Reviewed By: lblasa

Differential Revision: D30015807

fbshipit-source-id: 9f913e72617301273dbe12c60b9cdba8cea05537

desktop/.eslintrc.js

@@ -44,6 +44,7 @@ module.exports = {
     'react-hooks',
     'flipper',
     'promise',
+    'communist-spelling',
   ],
   rules: {
     // disable rules from eslint-config-fbjs
@@ -102,6 +103,7 @@ module.exports = {
     'flipper/no-relative-imports-across-packages': [2],
     'flipper/no-electron-remote-imports': [1],
     'flipper/no-console-error-without-context': [1],
+    'communist-spelling/communist-spelling': [1],
 
     // promise rules, see https://github.com/xjamundx/eslint-plugin-promise for details on each of them
     'promise/catch-or-return': 'warn',

desktop/package.json

@@ -140,6 +140,7 @@
     "eslint-config-prettier": "^8.3.0",
     "eslint-import-resolver-typescript": "^2.4.0",
     "eslint-plugin-babel": "^5.3.1",
+    "eslint-plugin-communist-spelling": "^1.0.0",
     "eslint-plugin-flipper": "0.0.0",
     "eslint-plugin-flowtype": "^5.8.2",
     "eslint-plugin-header": "^3.1.1",

desktop/yarn.lock

@@ -6580,6 +6580,13 @@ eslint-plugin-babel@^5.3.1:
   dependencies:
     eslint-rule-composer "^0.3.0"
 
+eslint-plugin-communist-spelling@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-communist-spelling/-/eslint-plugin-communist-spelling-1.0.0.tgz#e90cc2a5c7de0cf679084ae516f81767c471229d"
+  integrity sha512-y6E30QAv5w0naTZq2xtEuKG0fndFFUG5aYuO4AOcTogcSnn6B87K24+GAoxM9/ddS+rfPvghmifCy5xSb0gh0A==
+  dependencies:
+    requireindex "~1.1.0"
+
 eslint-plugin-es@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-es/-/eslint-plugin-es-3.0.0.tgz#98cb1bc8ab0aa807977855e11ad9d1c9422d014b"
@@ -12199,6 +12206,11 @@ require-main-filename@^2.0.0:
   resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-2.0.0.tgz#d0b329ecc7cc0f61649f62215be69af54aa8989b"
   integrity sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==
 
+requireindex@~1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/requireindex/-/requireindex-1.1.0.tgz#e5404b81557ef75db6e49c5a72004893fe03e162"
+  integrity sha1-5UBLgVV+91225JxacgBIk/4D4WI=
+
 reselect@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/reselect/-/reselect-4.0.0.tgz#f2529830e5d3d0e021408b246a206ef4ea4437f7"