chore: update packages version and dot files

Author: Giorgio Aquino

.babelrc

@@ -1,3 +1,3 @@
 {
-    "presets": [["babel-preset-gatsby-package"]]
+  "presets": ["babel-preset-gatsby-package"]
 }

.editorconfig

@@ -0,0 +1,10 @@
+# editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true

.eslintrc.json

@@ -0,0 +1,42 @@
+{
+  "parser": "babel-eslint",
+  "extends": ["google", "eslint:recommended", "prettier"],
+  "plugins": ["prettier", "filenames"],
+  "parserOptions": {
+    "ecmaVersion": 2016,
+    "sourceType": "module"
+  },
+  "env": {
+    "es6": true,
+    "node": true,
+    "jest": true
+  },
+  "globals": {
+    "before": true,
+    "spyOn": true,
+    "__PATH_PREFIX__": true,
+    "__BASE_PATH__": true,
+    "__ASSET_PREFIX__": true
+  },
+  "rules": {
+    "arrow-body-style": [
+      "error",
+      "as-needed",
+      { "requireReturnForObjectLiteral": true }
+    ],
+    "no-unused-expressions": [
+      "error",
+      {
+        "allowTaggedTemplates": true
+      }
+    ],
+    "consistent-return": ["error"],
+    "filenames/match-regex": ["error", "^[a-z-\\d\\.]+$", true],
+    "no-console": "off",
+    "no-inner-declarations": "off",
+    "prettier/prettier": "error",
+    "quotes": ["error", "backtick"],
+    "require-jsdoc": "off",
+    "valid-jsdoc": "off"
+  }
+}

.prettierignore

@@ -0,0 +1,10 @@
+*.min.js
+**/node_modules/**
+
+# fixtures
+**/__testfixtures__/**
+**/__tests__/fixtures/**
+
+# coverage
+coverage
+

.prettierrc.js

@@ -0,0 +1,19 @@
+module.exports = {
+  endOfLine: "lf",
+  semi: false,
+  singleQuote: false,
+  tabWidth: 2,
+  trailingComma: "es5",
+  overrides: [
+    {
+      // This file uses semicolons. It's needed here because `documentation`
+      // package (used to parse jsdoc and provide content for API reference pages)
+      // behaviour is inconsistent when not using semicolons after
+      // object declarations.
+      files: ["**/api-node-helpers-docs.js"],
+      options: {
+        semi: true
+      }
+    }
+  ]
+};