Add flow compatibility

browser/index.js

@@ -16,13 +16,13 @@ module.exports = {
   globals: {
     // TODO: We should not globalize this - we should explicitly import our CDN-sourced dependencies.
     Backbone: true,
-    
+
     /**
      * We need to globalize `analytics` because of the way Segment's library loads. It redefines
      * `window.analytics` after loading, which, when `analytics` is not globalized, causes issues
      * because the `analytics` rollup catches may not be the `window.analytics` we want.
      */
-    analytics: true    
+    analytics: true
   },
   rules: {
     'react/jsx-wrap-multilines': 2

index.js

@@ -38,7 +38,7 @@ module.exports = {
         }
       }
     }],
-    // Console logs should be mostly nonexistent, and places like app.js should just have a 
+    // Console logs should be mostly nonexistent, and places like app.js should just have a
     // /* eslint-disable no-console */
     // comment at the top.
     'no-console': ['error'],

node/flow.js

@@ -0,0 +1,39 @@
+module.exports = {
+  parser: 'babel-eslint',
+  extends: 'mixmax/node',
+  plugins: [
+    // Allows correct parsing of flow annotated files.
+    'flowtype'
+  ],
+  rules: {
+    'space-infix-ops': 0,
+    'no-duplicate-imports': 0,
+    // Makes flow `type` definitions defines
+    'flowtype/define-flow-type': 1,
+    // Do not allow spaces before type declarations, i.e. let a: number, not let a : number
+    'flowtype/space-before-type-colon': [
+      1,
+      'never'
+    ],
+    // Marks flow type declarations as used to prevent no-unused-vars for types
+    'flowtype/use-flow-type': 1,
+    // Enforces camelcase for type definitions
+    'flowtype/type-id-match': [
+      2,
+      '^([A-Z]+[a-z0-9A-Z]*)$'
+    ]
+  },
+  settings: {
+    // Only use the flow linter for files with `@flow`
+    flowtype: {
+      onlyFilesWithFlowAnnotation: true
+    }
+  },
+  parserOptions: {
+    // Required to support import/export syntax when using types
+    sourceType: 'module',
+    ecmaFeatures: {
+      experimentalObjectRestSpread: true,
+    },
+  }
+};

package.json

@@ -30,14 +30,15 @@
   },
   "homepage": "https://github.com/mixmaxhq/eslint-config-mixmax#readme",
   "optionalDependencies": {
-    "babel-eslint": "^7.2.3",
+    "babel-eslint": "^8.2.1",
+    "eslint-plugin-flowtype": "^2.41.0",
     "eslint-plugin-react": "^7.1.0"
   },
   "peerDependencies": {
-    "eslint": ">= 3"
+    "eslint": ">=4.14.0"
   },
   "devDependencies": {
-    "eslint": ">=3",
+    "eslint": ">=4.14.0",
     "eslint-config-mixmax": "^0.7.0",
     "pre-commit": "^1.2.2"
   },