diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..04a6d49
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,43 @@
+{
+  "env": {
+    "es6": true,
+    "node" : true,
+    "browser" : true
+  },
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    }
+  },
+  "extends": [ "eslint:recommended" ],
+  "rules": {
+    "arrow-body-style": "off",
+    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
+    "id-length": "off",
+    "indent": ["error", 2],
+    "newline-after-var": "off",
+    "newline-before-return": "off",
+    "multiline-ternary": "off",
+    "max-statements": ["error", 15],
+    "no-console": ["error", { allow: ["warn", "error"] }],
+    "no-magic-numbers": ["error", { "ignore": [0, 1, 2] }],
+    "no-param-reassign": "off",
+    "no-ternary": "off",
+    "object-curly-spacing": [
+      "error",
+      "always", { "arraysInObjects": false, "objectsInObjects": false }
+    ],
+    "object-curly-newline": "off",
+    "object-property-newline": "off",
+    "object-shorthand": "off",
+    "padded-blocks": "off",
+    "prefer-template": "off",
+    "quote-props": ["error", "as-needed"],
+    "require-jsdoc": "off",
+    "sort-imports": "off",
+    "sort-keys": "off",
+    "sort-vars": "off",
+    "space-before-function-paren": ["error", "never"]
+  }
+}
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..9c27aff
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+language: node_js
+node_js:
+  - "6"
+before_script:
+  - npm run lint
diff --git a/package-lock.json b/package-lock.json
index 0361a5b..60e0ed1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,6 +26,23 @@
         }
       }
     },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
+        "acorn": "3.3.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
+    },
     "ajv": {
       "version": "5.2.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.2.2.tgz",
@@ -55,6 +72,12 @@
         "repeat-string": "1.6.1"
       }
     },
+    "ansi-escapes": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-2.0.0.tgz",
+      "integrity": "sha1-W65SvkJIeN2Xg+iRDj/Cki6DyBs=",
+      "dev": true
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -77,6 +100,15 @@
         "normalize-path": "2.1.1"
       }
     },
+    "argparse": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
+      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "1.0.3"
+      }
+    },
     "arr-diff": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
@@ -92,12 +124,33 @@
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "1.0.3"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
     "array-unique": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
       "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM=",
       "dev": true
     },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
     "asn1.js": {
       "version": "4.9.1",
       "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.9.1.tgz",
@@ -194,6 +247,18 @@
         "source-map": "0.5.6"
       }
     },
+    "babel-eslint": {
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-7.2.3.tgz",
+      "integrity": "sha1-sv4tgBJkcPXBlELcdXJTqJdxCCc=",
+      "dev": true,
+      "requires": {
+        "babel-code-frame": "6.22.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0",
+        "babylon": "6.17.4"
+      }
+    },
     "babel-generator": {
       "version": "6.25.0",
       "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.25.0.tgz",
@@ -865,6 +930,21 @@
       "integrity": "sha1-hZgoeOIbmOHGZCXgPQF0eI9Wnug=",
       "dev": true
     },
+    "caller-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
+      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
+      "dev": true,
+      "requires": {
+        "callsites": "0.2.0"
+      }
+    },
+    "callsites": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
+      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "dev": true
+    },
     "camelcase": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
@@ -920,6 +1000,27 @@
         "safe-buffer": "5.1.1"
       }
     },
+    "circular-json": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
+      "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
+      "dev": true
+    },
+    "cli-cursor": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "2.0.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.1.0.tgz",
+      "integrity": "sha1-sjTKIJsp72b8UY2bmNWEewDt8Ao=",
+      "dev": true
+    },
     "cliui": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
@@ -943,6 +1044,21 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
+    "color-convert": {
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.0.tgz",
+      "integrity": "sha1-Gsz5fdc5uYO/mU1W/sj5WFNkG3o=",
+      "dev": true,
+      "requires": {
+        "color-name": "1.1.3"
+      }
+    },
+    "color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
+      "dev": true
+    },
     "commander": {
       "version": "2.11.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.11.0.tgz",
@@ -961,6 +1077,17 @@
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
+    "concat-stream": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.6.0.tgz",
+      "integrity": "sha1-CqxmL9Ur54lk1VMvaUeE5wEQrPc=",
+      "dev": true,
+      "requires": {
+        "inherits": "2.0.3",
+        "readable-stream": "2.3.3",
+        "typedarray": "0.0.6"
+      }
+    },
     "console-browserify": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/console-browserify/-/console-browserify-1.1.0.tgz",
@@ -1089,6 +1216,27 @@
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
       "dev": true
     },
+    "deep-is": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
+      "dev": true
+    },
+    "del": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/del/-/del-2.2.2.tgz",
+      "integrity": "sha1-wSyYHQZ4RshLyvhiz/kw2Qf/0ag=",
+      "dev": true,
+      "requires": {
+        "globby": "5.0.0",
+        "is-path-cwd": "1.0.0",
+        "is-path-in-cwd": "1.0.0",
+        "object-assign": "4.1.1",
+        "pify": "2.3.0",
+        "pinkie-promise": "2.0.1",
+        "rimraf": "2.6.1"
+      }
+    },
     "des.js": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/des.js/-/des.js-1.0.0.tgz",
@@ -1119,6 +1267,16 @@
         "randombytes": "2.0.5"
       }
     },
+    "doctrine": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.0.0.tgz",
+      "integrity": "sha1-xz2NKQnSIpHhoAejlYBNqLZl/mM=",
+      "dev": true,
+      "requires": {
+        "esutils": "2.0.2",
+        "isarray": "1.0.0"
+      }
+    },
     "dom-walk": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/dom-walk/-/dom-walk-0.1.1.tgz",
@@ -1270,6 +1428,85 @@
         "estraverse": "4.2.0"
       }
     },
+    "eslint": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-4.4.1.tgz",
+      "integrity": "sha1-mc1+r8/8ov+Zpcj18qR01jZLS9M=",
+      "dev": true,
+      "requires": {
+        "ajv": "5.2.2",
+        "babel-code-frame": "6.22.0",
+        "chalk": "1.1.3",
+        "concat-stream": "1.6.0",
+        "cross-spawn": "5.1.0",
+        "debug": "2.6.8",
+        "doctrine": "2.0.0",
+        "eslint-scope": "3.7.1",
+        "espree": "3.5.0",
+        "esquery": "1.0.0",
+        "estraverse": "4.2.0",
+        "esutils": "2.0.2",
+        "file-entry-cache": "2.0.0",
+        "functional-red-black-tree": "1.0.1",
+        "glob": "7.1.2",
+        "globals": "9.18.0",
+        "ignore": "3.3.3",
+        "imurmurhash": "0.1.4",
+        "inquirer": "3.2.1",
+        "is-resolvable": "1.0.0",
+        "js-yaml": "3.9.1",
+        "json-stable-stringify": "1.0.1",
+        "levn": "0.3.0",
+        "lodash": "4.17.4",
+        "minimatch": "3.0.4",
+        "mkdirp": "0.5.1",
+        "natural-compare": "1.4.0",
+        "optionator": "0.8.2",
+        "path-is-inside": "1.0.2",
+        "pluralize": "4.0.0",
+        "progress": "2.0.0",
+        "require-uncached": "1.0.3",
+        "semver": "5.4.1",
+        "strip-json-comments": "2.0.1",
+        "table": "4.0.1",
+        "text-table": "0.2.0"
+      }
+    },
+    "eslint-scope": {
+      "version": "3.7.1",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-3.7.1.tgz",
+      "integrity": "sha1-PWPD7f2gLgbgGkUq2IyqzHzctug=",
+      "dev": true,
+      "requires": {
+        "esrecurse": "4.2.0",
+        "estraverse": "4.2.0"
+      }
+    },
+    "espree": {
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-3.5.0.tgz",
+      "integrity": "sha1-mDWGJb3QVYYeon4oZ+pyn69GPY0=",
+      "dev": true,
+      "requires": {
+        "acorn": "5.1.1",
+        "acorn-jsx": "3.0.1"
+      }
+    },
+    "esprima": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.0.tgz",
+      "integrity": "sha512-oftTcaMu/EGrEIu904mWteKIv8vMuOgGYo7EhVJJN00R/EED9DCua/xxHRdYnKtcECzVg7xOWhflvJMnqcFZjw==",
+      "dev": true
+    },
+    "esquery": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/esquery/-/esquery-1.0.0.tgz",
+      "integrity": "sha1-z7qLV9f7qT8XKYqKAGoEzaE9gPo=",
+      "dev": true,
+      "requires": {
+        "estraverse": "4.2.0"
+      }
+    },
     "esrecurse": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.2.0.tgz",
@@ -1350,6 +1587,17 @@
         "fill-range": "2.2.3"
       }
     },
+    "external-editor": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-2.0.4.tgz",
+      "integrity": "sha1-HtkZnanL/i7y96MbL96LDRI2iXI=",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.18",
+        "jschardet": "1.5.1",
+        "tmp": "0.0.31"
+      }
+    },
     "extglob": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/extglob/-/extglob-0.3.2.tgz",
@@ -1365,6 +1613,31 @@
       "integrity": "sha1-liVqO8l1WV6zbYLpkp0GDYk0Of8=",
       "dev": true
     },
+    "fast-levenshtein": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
+      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
+      "dev": true
+    },
+    "figures": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/figures/-/figures-2.0.0.tgz",
+      "integrity": "sha1-OrGi0qYsi/tDGgyUy3l6L84nyWI=",
+      "dev": true,
+      "requires": {
+        "escape-string-regexp": "1.0.5"
+      }
+    },
+    "file-entry-cache": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-2.0.0.tgz",
+      "integrity": "sha1-w5KZDD5oR4PYOLjISkXYoEhFg2E=",
+      "dev": true,
+      "requires": {
+        "flat-cache": "1.2.2",
+        "object-assign": "4.1.1"
+      }
+    },
     "filename-regex": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/filename-regex/-/filename-regex-2.0.1.tgz",
@@ -1404,6 +1677,18 @@
         "locate-path": "2.0.0"
       }
     },
+    "flat-cache": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-1.2.2.tgz",
+      "integrity": "sha1-+oZxTnLCHbiGAXYezy9VXRq8a5Y=",
+      "dev": true,
+      "requires": {
+        "circular-json": "0.3.3",
+        "del": "2.2.2",
+        "graceful-fs": "4.1.11",
+        "write": "0.2.1"
+      }
+    },
     "for-in": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",
@@ -1431,6 +1716,12 @@
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
       "dev": true
     },
+    "functional-red-black-tree": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/functional-red-black-tree/-/functional-red-black-tree-1.0.1.tgz",
+      "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=",
+      "dev": true
+    },
     "get-caller-file": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.2.tgz",
@@ -1500,6 +1791,20 @@
       "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ==",
       "dev": true
     },
+    "globby": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/globby/-/globby-5.0.0.tgz",
+      "integrity": "sha1-69hGZ8oNuzMLmbz8aOrCvFQ3Dg0=",
+      "dev": true,
+      "requires": {
+        "array-union": "1.0.2",
+        "arrify": "1.0.1",
+        "glob": "7.1.2",
+        "object-assign": "4.1.1",
+        "pify": "2.3.0",
+        "pinkie-promise": "2.0.1"
+      }
+    },
     "graceful-fs": {
       "version": "4.1.11",
       "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
@@ -1573,12 +1878,30 @@
       "integrity": "sha1-P5E2XKvmC3ftDruiS0VOPgnZWoI=",
       "dev": true
     },
+    "iconv-lite": {
+      "version": "0.4.18",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.18.tgz",
+      "integrity": "sha512-sr1ZQph3UwHTR0XftSbK85OvBbxe/abLGzEnPENCQwmHf7sck8Oyu4ob3LgBxWWxRoM+QszeUyl7jbqapu2TqA==",
+      "dev": true
+    },
     "ieee754": {
       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.8.tgz",
       "integrity": "sha1-vjPUCsEO8ZJnAfbwii2G+/0a0+Q=",
       "dev": true
     },
+    "ignore": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-3.3.3.tgz",
+      "integrity": "sha1-QyNS5XrM2HqzEQ6C0/6g5HgSFW0=",
+      "dev": true
+    },
+    "imurmurhash": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
+      "integrity": "sha1-khi5srkoojixPcT7a21XbyMUU+o=",
+      "dev": true
+    },
     "indexof": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/indexof/-/indexof-0.0.1.tgz",
@@ -1601,6 +1924,74 @@
       "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
       "dev": true
     },
+    "inquirer": {
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+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
+      "dev": true
+    },
     "uglify-js": {
       "version": "2.8.29",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
@@ -3037,6 +3726,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "0.5.1"
+      }
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
diff --git a/package.json b/package.json
index 23b0fa9..0f31349 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,9 @@
   "name": "vim-vixen",
   "description": "Vim vixen",
   "scripts": {
-    "start": "webpack -w --debug"
+    "start": "webpack -w --debug",
+    "lint": "eslint src",
+    "test": "true"
   },
   "repository": {
     "type": "git",
@@ -16,8 +18,10 @@
   "homepage": "https://github.com/ueokande/vim-vixen",
   "devDependencies": {
     "babel-cli": "^6.24.1",
+    "babel-eslint": "^7.2.3",
     "babel-loader": "^7.1.1",
     "babel-preset-es2015": "^6.24.1",
+    "eslint": "^4.4.1",
     "webpack": "^3.5.3"
   }
 }
diff --git a/src/module.js b/src/module.js
index 4378d0d..e967a62 100644
--- a/src/module.js
+++ b/src/module.js
@@ -1,4 +1,4 @@
-const initialize = (url) => {
+const initialize = () => {
   let p = document.createElement("p");
   p.textContent = "Hello Vim Vixen";
   p.style.position = 'fixed';