title: npm throwing an error at the end of the eslint report
body: <p>I have an issue when running eslint on my typescript project. I have the following package.json, where I wrote a script to run eslint:</p>
  
  <pre><code>{
    "name": "ts-tutorial",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
      "transpile": "tsc",
      "lint": "eslint src --ext ts"
    },
    "author": "",
    "license": "ISC",
    "devDependencies": {
      "eslint": "^4.19.1",
      "eslint-config-standard": "^11.0.0",
      "eslint-plugin-import": "^2.9.0",
      "eslint-plugin-node": "^6.0.1",
      "eslint-plugin-promise": "^3.7.0",
      "eslint-plugin-standard": "^3.0.1",
      "typescript": "^2.7.2",
      "typescript-eslint-parser": "^14.0.0"
    }
  }
  </code></pre>
  
  <p>So now, when I run <code>npm run ling</code> I get the right output, with all the error that my code has, that need to be linted. But at the end of the list, I see an npm error:</p>
  
  <pre><code>✖ 7 problems (7 errors, 0 warnings)
    6 errors, 0 warnings potentially fixable with the `--fix` option.
  
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! ts-tutorial@1.0.0 lint: `eslint src --ext ts`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the ts-tutorial@1.0.0 lint script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /home/dbugger/.npm/_logs/2018-03-26T16_44_57_459Z-debug.log
  </code></pre>
  
  <p>What is causing this error? I have read the log file, but I cannot understand what is the problem from reading it.</p>
  
  <pre><code>0 info it worked if it ends with ok
  1 verbose cli [ '/usr/bin/node', '/usr/bin/npm', 'run', 'lint' ]
  2 info using npm@5.5.1
  3 info using node@v8.9.3
  4 verbose run-script [ 'prelint', 'lint', 'postlint' ]
  5 info lifecycle ts-tutorial@1.0.0~prelint: ts-tutorial@1.0.0
  6 info lifecycle ts-tutorial@1.0.0~lint: ts-tutorial@1.0.0
  7 verbose lifecycle ts-tutorial@1.0.0~lint: unsafe-perm in lifecycle true
  8 verbose lifecycle ts-tutorial@1.0.0~lint: PATH: /usr/lib/node_modules/npm/bin/node-gyp-bin:/home/dbugger/projects/exercises/ts-tutorial/node_modules/.bin:/home/dbugger/.rbenv/plugins/ruby-build/bin:/home/dbugger/.rbenv/shims:/home/dbugger/.rbenv/bin:/home/dbugger/npm-global/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
  9 verbose lifecycle ts-tutorial@1.0.0~lint: CWD: /home/dbugger/projects/exercises/ts-tutorial
  10 silly lifecycle ts-tutorial@1.0.0~lint: Args: [ '-c', 'eslint src --ext ts' ]
  11 silly lifecycle ts-tutorial@1.0.0~lint: Returned: code: 1  signal: null
  12 info lifecycle ts-tutorial@1.0.0~lint: Failed to exec lint script
  13 verbose stack Error: ts-tutorial@1.0.0 lint: `eslint src --ext ts`
  13 verbose stack Exit status 1
  13 verbose stack     at EventEmitter.&lt;anonymous&gt; (/usr/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:280:16)
  13 verbose stack     at emitTwo (events.js:126:13)
  13 verbose stack     at EventEmitter.emit (events.js:214:7)
  13 verbose stack     at ChildProcess.&lt;anonymous&gt; (/usr/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
  13 verbose stack     at emitTwo (events.js:126:13)
  13 verbose stack     at ChildProcess.emit (events.js:214:7)
  13 verbose stack     at maybeClose (internal/child_process.js:925:16)
  13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
  14 verbose pkgid ts-tutorial@1.0.0
  15 verbose cwd /home/dbugger/projects/exercises/ts-tutorial
  16 verbose Linux 4.13.0-37-generic
  17 verbose argv "/usr/bin/node" "/usr/bin/npm" "run" "lint"
  18 verbose node v8.9.3
  19 verbose npm  v5.5.1
  20 error code ELIFECYCLE
  21 error errno 1
  22 error ts-tutorial@1.0.0 lint: `eslint src --ext ts`
  22 error Exit status 1
  23 error Failed at the ts-tutorial@1.0.0 lint script.
  23 error This is probably not a problem with npm. There is likely additional logging output above.
  24 verbose exit [ 1, true ]
  </code></pre>