Add eclint to pretest script

.editorconfig

@@ -9,6 +9,9 @@ end_of_line = lf
 indent_style = tab
 insert_final_newline = true
 trim_trailing_whitespace = true
+block_comment_start = /*
+block_comment = *
+block_comment_end = */
 
 [*.{cmd,bat}]
 end_of_line = crlf
@@ -20,5 +23,5 @@ tab_width = 2
 indent_style = space
 indent_size = 2
 
-[*.json]
+[lib/*.json]
 insert_final_newline = false

.eslintrc.json

@@ -8,7 +8,7 @@
 		"standard"
 	],
 	"parserOptions": {
-        "sourceType": "script",
+	"sourceType": "script",
 		"ecmaVersion": 2017
 	},
 	"root": true,

README.md

@@ -113,7 +113,7 @@ reporter({
 		const path = file.path;
 		return error => {
 			// Do not report unrelated errors.
- 			if (error.fileName === path) {
+			if (error.fileName === path) {
 				return error
 			}
 		}

appveyor.yml

@@ -12,6 +12,7 @@ environment:
 install:
   # install Node.js
   - ps: Install-Product node $env:nodejs_version
+  - npm install -g npm@latest
   # install modules
   - npm install
 

package.json

@@ -115,7 +115,8 @@
     "test_lang": "cross-env LC_ALL=zh_CN npm run mocha -- --color && cross-env LC_ALL=en_US npm run mocha -- --no-color",
     "report-coverage": "codecov",
     "mocha": "mocha \"test/*.test.js\" --no-timeouts",
-    "pretest": "eslint scripts lib \"test/*.js\" && npm run shorturl",
+    "eclint": "eclint check $(git ls-files | grep --invert-match ^test/fixtures/)",
+    "pretest": "eslint scripts lib \"test/*.js\" && npm run eclint --script-shell=sh && npm run shorturl",
     "shorturl": "node scripts/shorturl",
     "test": "nyc npm run test_lang"
   },