[Tests] add npm run lint

.eslintrc

@@ -0,0 +1,18 @@
+{
+    "extends": "@ljharb",
+    "root": true,
+    "rules": {
+		"func-style": 1,
+		"operator-linebreak": [2, "before"],
+    },
+    "overrides": [
+        {
+            "files": "test/**",
+            "rules": {
+                "global-require": 0,
+                "max-lines-per-function": 0,
+				"no-negated-condition": 0,
+            },
+        },
+    ],
+}

package.json

@@ -13,6 +13,8 @@
 		"./package.json": "./package.json"
 	},
 	"scripts": {
+		"lint": "eslint .",
+		"pretest": "npm run lint",
 		"tests-only": "tape test",
 		"test": "npm run tests-only",
 		"posttest": "aud --production"
@@ -42,7 +44,9 @@
 		"has": "^1.0.3"
 	},
 	"devDependencies": {
+		"@ljharb/eslint-config": "^17.2.0",
 		"aud": "^1.1.2",
+		"eslint": "^7.10.0",
 		"tape": "^5.0.1"
 	}
 }