Merge branch 'task/add-eslint' into task/add-prettier

eslint/README.md

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+# @bufferapp/eslint-config-bufferapp
+
+This is the standard ESLint config files for the projects within the @bufferapp
+ GitHub organization.
+
+## Usage
+
+```console
+npm install --save-dev @bufferapp/eslint-config eslint
+# or
+yarn add -D @bufferapp/eslint-config eslint
+```
+
+NOTE: We will need to define custom installation instructions for front-end
+ and backend-based configs, depending on those we will have different
+  `peerDependencies` for the ESLint configs.
+
+And then, on your `.eslintrc` use:
+
+```
+"extends": "@bufferapp/eslint-config-bufferapp/backend"
+#or
+"extends": "@bufferapp/eslint-config-bufferapp/frontend"
+```

eslint/backend.js

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+module.exports = {
+    extends: [
+        "./index.js",
+        "plugin:@typescript-eslint/recommended",
+        "prettier/@typescript-eslint"
+    ],
+    plugins: [
+        "typescript-eslint",
+    ],
+    parser: "@typescript-eslint/parser",
+    ignorePatterns: ["node_modules/*"],
+    env: {
+        node: true,
+        es6: true,
+        jest: true,
+    }
+}

eslint/frontend.js

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+module.exports = {
+    extends: [
+        "./index.js",
+        "plugin:react/recommended",
+        "prettier/react"
+    ],
+    plugins: [
+        "react",
+    ],
+    env: {
+        browser: true,
+        es6: true,
+        jest: true,
+    }
+}

eslint/index.js

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+module.exports = {
+    extends: [
+        "standard",
+        "eslint:recommended",
+        "prettier",
+    ],
+    parserOptions: {
+        ecmaVersion: 2018,
+        sourceType: "module"
+    },
+    plugins: ["prettier", "jest"],
+}
+

eslint/package.json

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+{
+  "name": "@bufferapp/eslint-config-bufferapp",
+  "version": "0.0.1",
+  "description": "This package provides Buffer's ESLint as an extensible shared config, and specific backend/frontend setups.",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Mike San Román <[email protected]>",
+  "license": "ISC",
+  "peerDependencies": {
+    "eslint": ">= 6"
+  }
+}