Issue 5257 - Add an eslint target to npm run and run it posttest.

package.json

Index: package.json
===================================================================
--- a/package.json
+++ b/package.json
@@ -1,15 +1,19 @@
 {
   "name": "adblockpluscore",
   "repository": "https://hg.adblockplus.org/adblockpluscore",
   "license": "GPL-3.0",
   "dependencies": {},
   "devDependencies": {
     "chrome-remote-interface": "^0.20.0",
+    "eslint": "^3.19.0",
+    "eslint-config-eyeo": "1.0.4",
     "nodeunit": "0.9.1",
     "sandboxed-module": "2.0.3",
     "unzip": "^0.1.11"
   },
   "scripts": {
-    "test": "node test_runner.js"
+    "eslint": "eslint *.js lib test chrome",

[Wladimir Palant, 2017/05/19 15:52:31]

IMHO, this will run the global ESLint and not the one you added as dependency
here.

[hub, 2017/05/19 16:47:31]

$ which eslint
eslint not found

If I echo $PATH from the npm test command, I get the output of `npm bin` ahead
of the system directories, like /usr/local/bin.

So it will definitely use the one npm just installed locally.

[Wladimir Palant, 2017/05/19 18:12:31]

Good to know, definitely saves some complexity here.

+    "test": "node test_runner.js",
+    "posttest": "npm run eslint"
   }
 }