gulp-eslint simple example

gulpfile.js

const gulp = require('gulp');
const eslint = require('gulp-eslint');

gulp.task('lint', function () {
  return gulp.src(['**/*.js','!node_modules/**'])
    .pipe(eslint())
    .pipe(eslint.format())
    .pipe(eslint.failAfterError());
});

gulp.task('default', ['lint']);

index.js

const awesome = () => console.log(`who's awesome? you're awesome`);

package.json

{
  "name": "eslint",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {},
  "devDependencies": {
    "gulp": "^3.9.0",
    "gulp-eslint": "^1.1.1"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "lint": "gulp lint"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

shell

/tmp/eslint 46s
❯ npm run lint

> [email protected] lint /private/tmp/eslint
> gulp lint

[15:49:58] Using gulpfile /private/tmp/eslint/gulpfile.js
[15:49:58] Starting 'lint'...
[15:49:59]
gulpfile.js
  1:2  error  Parsing error: Unexpected token const

index.js
  1:2  error  Parsing error: Unexpected token const

✖ 2 problems (2 errors, 0 warnings)

[15:49:59] 'lint' errored after 453 ms
[15:49:59] ESLintError in plugin 'gulp-eslint'
Message:
    Failed with 2 errors

npm ERR! Darwin 14.5.0
npm ERR! argv "/Users/couto/.nvm/versions/node/v5.1.0/bin/node" "/Users/couto/.nvm/versions/node/v5.1.0/bin/npm" "run" "lint"
npm ERR! node v5.1.0
npm ERR! npm  v3.3.12
npm ERR! code ELIFECYCLE
npm ERR! [email protected] lint: `gulp lint`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] lint script 'gulp lint'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the eslint package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     gulp lint
npm ERR! You can get their info via:
npm ERR!     npm owner ls eslint
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /private/tmp/eslint/npm-debug.log