Add ESLint

Author: tetsuharuohzeki

.eslintignore

@@ -0,0 +1,2 @@
+# include as a lint target.
+!.eslintrc.js

.eslintrc.js

@@ -0,0 +1,26 @@
+/*eslint-env commonjs*/
+/*eslint quote-props: [2, "always"] */
+
+'use strict';
+
+// ESLint Configuration Files enables to include comments.
+// http://eslint.org/docs/configuring/#comments-in-configuration-files
+module.exports = {
+    'extends': [
+        './node_modules/eslint-config-fluct/config/eslintrc_core.js',
+    ],
+
+    'parserOptions': {
+        'ecmaVersion': 2018,
+    },
+
+    'env': {
+        'es6': true,
+    },
+
+    'root': true,
+
+    'rules': {
+        'no-magic-numbers': 'off',
+    }
+};

Makefile

@@ -0,0 +1,18 @@
+NPM_MOD_DIR := $(CURDIR)/node_modules
+NPM_BIN := $(NPM_MOD_DIR)/.bin
+
+all: help
+
+help:
+	@echo "Specify the task"
+	@grep -E '^[0-9a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+	@exit 1
+
+# Test
+test: lint ## Run tests & lints for all.
+
+lint: eslint
+
+.PHONY: eslint
+eslint:
+	$(NPM_BIN)/eslint --ext=js,jsx,mjs $(CURDIR)

package.json

@@ -6,5 +6,9 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "",
-  "license": "MIT"
+  "license": "MIT",
+  "devDependencies": {
+    "eslint": "^5.12.0",
+    "eslint-config-fluct": "https://github.com/voyagegroup/eslint-config-fluct/archive/d62dacdcfcdb68b9d0416fb75abca516a4d938d7.tar.gz"
+  }
 }