Add editorconfig

Author: SimenB

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+end_of_line = lf
+# editorconfig-tools is unable to ignore longs strings or urls
+max_line_length = null

packages/eslint-config-airbnb-base/.editorconfig

@@ -0,0 +1 @@
+../../.editorconfig

packages/eslint-config-airbnb-base/package.json

@@ -4,6 +4,7 @@
   "description": "Airbnb's base JS ESLint config, following our styleguide",
   "main": "index.js",
   "scripts": {
+    "prelint": "editorconfig-tools check * rules/* test/*",
     "lint": "eslint .",
     "tests-only": "babel-tape-runner ./test/test-*.js",
     "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test) && safe-publish-latest",
@@ -47,6 +48,7 @@
   "devDependencies": {
     "babel-preset-airbnb": "^2.1.1",
     "babel-tape-runner": "^2.0.1",
+    "editorconfig-tools": "^0.1.1",
     "eslint": "^3.12.1",
     "eslint-find-rules": "^1.14.3",
     "eslint-plugin-import": "^2.2.0",

packages/eslint-config-airbnb/.editorconfig

@@ -0,0 +1 @@
+../../.editorconfig

packages/eslint-config-airbnb/package.json

@@ -4,6 +4,7 @@
   "description": "Airbnb's ESLint config, following our styleguide",
   "main": "index.js",
   "scripts": {
+    "prelint": "editorconfig-tools check * rules/* test/*",
     "lint": "eslint .",
     "tests-only": "babel-tape-runner ./test/test-*.js",
     "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test) && safe-publish-latest",
@@ -50,6 +51,7 @@
   "devDependencies": {
     "babel-preset-airbnb": "^2.1.1",
     "babel-tape-runner": "^2.0.1",
+    "editorconfig-tools": "^0.1.1",
     "eslint": "^3.12.1",
     "eslint-find-rules": "^1.14.3",
     "eslint-plugin-import": "^2.2.0",