Add linters

package.json

@@ -31,6 +31,9 @@
     "cheerio": "^1.0.0-rc.3"
   },
   "devDependencies": {
-    "jest": "^24.8.0"
+    "jest": "^24.8.0",
+    "tslint": "^5.17.0",
+    "tslint-config-prettier": "^1.18.0",
+    "typescript": "^3.5.2"
   }
 }

tslint.json

@@ -0,0 +1,20 @@
+{
+  "extends": ["tslint:latest", "tslint-config-prettier"],
+  "rules": {
+    "import-name": false,
+    "indent": [true, "spaces", 2],
+    "max-line-length": [true, 120],
+    "ter-arrow-parens": [false],
+    "strict-boolean-expressions": [false],
+    "variable-name": [false],
+    "semicolon": [true, "always", "ignore-bound-class-methods"],
+    "prefer-array-literal": [false],
+    "quotemark": [
+      true,
+      "single",
+      "jsx-double",
+      "avoid-escape",
+      "avoid-template"
+    ]
+  }
+}