dep: Upgrade packages & switch to yarn

.circleci/config.yml

@@ -1,42 +1,26 @@
-# Javascript Node CircleCI 2.0 configuration file
-#
-# Check https://circleci.com/docs/2.0/language-javascript/ for more details
-#
-version: 2
+version: 2.1
 jobs:
   build:
-    docker:
-      # specify the version you desire here
-      - image: circleci/node:8.11.1
-
-      # Specify service dependencies here if necessary
-      # CircleCI maintains a library of pre-built images
-      # documented at https://circleci.com/docs/2.0/circleci-images/
-      # - image: circleci/mongo:3.4.4
-
     working_directory: ~/repo
-
+    docker:
+      - image: circleci/node:lts
     steps:
       - checkout
-
-      # Download and cache dependencies
       - restore_cache:
+          name: Restore Yarn Package Cache
           keys:
-          - v2.0.0-dependencies-{{ checksum "package.json" }}
-          # fallback to using the latest cache if no exact match is found
-          # - v2-dependencies-
-
-      - run: npm install
-
+            - yarn-packages-{{ checksum "yarn.lock" }}
+      - run:
+          name: Install Dependencies
+          command: yarn install --frozen-lockfile
       - save_cache:
+          name: Save Yarn Package Cache
+          key: yarn-packages-{{ checksum "yarn.lock" }}
           paths:
-            - node_modules
-          key: v2.0.0-dependencies-{{ checksum "package.json" }}
-
-      - run: 
+            - ~/.cache/yarn
+      - run:
           name: Run Test Suite
           command: npm run test:coverage
-
-      - run: 
+      - run:
           name: Upload Test Coverage Report
           command: ./node_modules/.bin/codecov

.eslintrc.json

@@ -1,25 +1,35 @@
 {
   "env": {
+    "node": true,
+    "es6": true,
     "browser": true,
     "jest": true
   },
   "extends": [
-    "airbnb",
-    "plugin:react/recommended",
-    "prettier/react",
-    "prettier"
+    "plugin:import/errors",
+    "plugin:import/warnings",
+    "eslint:recommended",
+    "plugin:prettier/recommended",
+    "plugin:react/recommended"
   ],
-  "parser": "babel-eslint",
+  "parserOptions": {
+    "ecmaVersion": 2018,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "jsx": true
+    }
+  },
   "plugins": [
-    "import",
-    "jsx-a11y",
-    "prettier",
     "react"
   ],
   "rules": {
     "no-underscore-dangle": 0,
     "prettier/prettier": "error",
-    "react/jsx-filename-extension": 0,
-    "react/no-typos": 0
+    "react/jsx-filename-extension": 0
+  },
+  "settings": {
+    "react": {
+      "version": "detect"
+    }
   }
 }