Added .eslintrc.js & .eslintignore.

Added eslint dependencies to package.json and updated yarn.lock accordingly.
Updated react-native to 0.59.5.

.eslintignore

@@ -0,0 +1,4 @@
+/nodejs-assets/*
+/ios/*
+/android/*
+!.eslintrc.js

.eslintrc.js

@@ -0,0 +1,71 @@
+module.exports = {
+	"parser": "babel-eslint",
+	"env": {
+		"es6": true,
+		"node": true,
+		"jest": true,
+		"browser": true,
+		"react-native/react-native": true,
+	},
+	"plugins": [
+		"react",
+		"react-native",
+		"jsx-a11y"
+	],
+	"parserOptions": {
+		"ecmaFeatures": {
+			"jsx": true
+		}
+	},
+	"extends": [
+		"eslint:recommended",
+		"plugin:jsx-a11y/recommended",
+		"plugin:react/recommended"
+	],
+	"rules": {
+		"no-console": 0,
+		"no-empty": ["error", { "allowEmptyCatch": true }],
+		"no-buffer-constructor": 0,
+		"no-case-declarations": 0,
+		"no-useless-escape": 0,
+		"semi": 2,
+		"react/jsx-no-duplicate-props": [2, { "ignoreCase": true }],
+		"react-native/no-unused-styles": 1,
+		"react-native/no-raw-text": 2,
+		"react/jsx-equals-spacing": [2, "never"],
+		"react/no-unsafe": [2, { "checkAliases": true }],
+		"react/jsx-curly-spacing": [2, {
+			"when": "never",
+			"attributes": { "allowMultiline": true },
+			"children": true,
+			"spacing": {
+				"objectLiterals": "never",
+			}
+		}],
+		"react/jsx-uses-vars": 2,
+		"react/jsx-wrap-multilines": 2,
+		"react/jsx-tag-spacing": [2,
+			{
+				"closingSlash": "never",
+				"beforeSelfClosing": "always",
+				"afterOpening": "never",
+				"beforeClosing": "never"
+			}
+		],
+		"react/jsx-indent": [2, "tab"],
+		"react/jsx-closing-bracket-location": 2,
+		"react/jsx-child-element-spacing": 2,
+		"react/no-unused-prop-types": 2,
+		"react/prop-types": 0,
+		"no-undef": 0,
+		"react/display-name": 0
+	},
+	"globals": {
+		"fetch": false
+	},
+	"settings": {
+		"react": {
+			"version": "detect",
+		},
+	},
+};

package.json

@@ -5,6 +5,7 @@
   "scripts": {
     "start": "node node_modules/react-native/local-cli/cli.js start",
     "test": "jest",
+    "lint": "eslint '**/*.{js,jsx}' --quiet",
     "postinstall": "rn-nodeify --install buffer,stream,assert,events,crypto,vm --hack && cd node_modules/bs58 && yarn add [email protected] && cd ../../"
   },
   "dependencies": {
@@ -27,7 +28,7 @@
     "prop-types": "^15.7.2",
     "query-string": "^6.4.2",
     "react": "^16.8.6",
-    "react-native": "^0.59.4",
+    "react-native": "^0.59.5",
     "react-native-camera": "^2.5.0",
     "react-native-crypto": "^2.1.2",
     "react-native-keychain": "^3.1.1",
@@ -55,7 +56,13 @@
     "@babel/core": "^7.4.3",
     "@babel/runtime": "^7.4.3",
     "babel-core": "^6.26.3",
+    "babel-eslint": "^10.0.1",
     "babel-jest": "^24.7.1",
+    "eslint": "^5.16.0",
+    "eslint-plugin-import": "^2.16.0",
+    "eslint-plugin-jsx-a11y": "^6.2.1",
+    "eslint-plugin-react": "^7.12.4",
+    "eslint-plugin-react-native": "^3.6.0",
     "jest": "^24.7.1",
     "metro-react-native-babel-preset": "^0.53.1",
     "react-test-renderer": "^16.8.6",