Create a base backend package with all the configuration files

.gitignore

@@ -102,3 +102,9 @@ dist
 
 # TernJS port file
 .tern-port
+
+# PHPSTORM
+.idea
+
+# Typescript Build
+lib

backend/base-backend-package/.eslintrc.json

@@ -0,0 +1,37 @@
+{
+    "env": {
+        "browser": true,
+        "es6": true,
+        "jest": true
+    },
+    "extends": [
+        "standard",
+        "eslint:recommended",
+        "prettier",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:prettier/recommended"  // Enables eslint-plugin-prettier and displays prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
+    ],
+    "ignorePatterns": ["node_modules/*", "lib/*"],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "ecmaVersion": 2018,
+        "sourceType": "module"
+    },
+    "plugins": [
+        "prettier",
+        "@typescript-eslint",
+        "jest"
+    ],
+    "rules": {
+        "@typescript-eslint/no-unused-vars": "error",
+        "@typescript-eslint/explicit-function-return-type": "error",
+        "@typescript-eslint/explicit-module-boundary-types": "error",
+        "jest/no-disabled-tests": "warn",
+        "jest/no-focused-tests": "error",
+        "jest/no-identical-title": "error",
+        "jest/prefer-to-have-length": "warn",
+        "jest/valid-expect": "error",
+        "no-underscore-dangle": "off"
+    }
+}
+

backend/base-backend-package/.prettierrc.json

@@ -0,0 +1,7 @@
+{
+  "trailingComma": "all",
+  "tabWidth": 2,
+  "semi": false,
+  "singleQuote": true,
+  "bracketSpacing": true
+}

backend/base-backend-package/README.md

@@ -0,0 +1,7 @@
+# Base Backend Package
+
+This package provides the base setup to build a new backend package at Buffer:
+- ESlint + Prettier
+- TypeScript
+- Jest
+- Package commands

backend/base-backend-package/jest.config.ts

@@ -0,0 +1,12 @@
+import type { Config } from '@jest/types'
+
+const config: Config.InitialOptions = {
+  verbose: true,
+  modulePathIgnorePatterns: ['node_modules/'],
+  preset: 'ts-jest',
+  setupFilesAfterEnv: ['./jest.env.ts'],
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+}
+
+export default config

backend/base-backend-package/jest.env.ts

@@ -0,0 +1 @@
+process.env.FOO = 'bar'