Refactor to TypeScript (#95)

* Refactor to TypeScript

* Fix Node 6

* Prettier

* Fix "end" event on non-200 status codes

Fixes #87.
Closes #93.

* Prettier

* Prettier

* Better

.gitignore

@@ -1,3 +1,4 @@
 /node_modules
 /yarn.lock
-/?.js
+/?.?s
+/dist

package.json

@@ -2,10 +2,17 @@
   "name": "https-proxy-agent",
   "version": "4.0.0",
   "description": "An HTTP(s) proxy `http.Agent` implementation for HTTPS",
-  "main": "./index.js",
-  "types": "./index.d.ts",
+  "main": "dist/index",
+  "types": "dist/index",
+  "files": [
+    "dist"
+  ],
   "scripts": {
-    "test": "mocha --reporter spec"
+    "prebuild": "rimraf dist",
+    "build": "tsc",
+    "test": "mocha --reporter spec",
+    "test-lint": "eslint src --ext .js,.ts",
+    "prepublishOnly": "npm run build"
   },
   "repository": {
     "type": "git",
@@ -23,14 +30,27 @@
     "url": "https://github.com/TooTallNate/node-https-proxy-agent/issues"
   },
   "dependencies": {
-    "agent-base": "5",
+    "agent-base": "6",
     "debug": "4"
   },
   "devDependencies": {
-    "mocha": "6",
-    "proxy": "1"
+    "@types/debug": "4",
+    "@types/node": "^12.12.11",
+    "@typescript-eslint/eslint-plugin": "1.6.0",
+    "@typescript-eslint/parser": "1.1.0",
+    "eslint": "5.16.0",
+    "eslint-config-airbnb": "17.1.0",
+    "eslint-config-prettier": "4.1.0",
+    "eslint-import-resolver-typescript": "1.1.1",
+    "eslint-plugin-import": "2.16.0",
+    "eslint-plugin-jsx-a11y": "6.2.1",
+    "eslint-plugin-react": "7.12.4",
+    "mocha": "^6.2.2",
+    "proxy": "1",
+    "rimraf": "^3.0.0",
+    "typescript": "^3.5.3"
   },
   "engines": {
-    "node": ">= 6.0.0"
+    "node": ">= 6"
   }
 }