Convert to TypeScript (#20)

.gitignore

@@ -7,3 +7,6 @@ Thumbs.db
 *.bak
 *.log
 logs
+*.map
+index.js
+index.d.ts

.npmrc

@@ -0,0 +1 @@
+package-lock=false

.travis.yml

@@ -1,3 +1,3 @@
 language: node_js
 node_js:
-- '7'
+- stable

package.json

@@ -14,29 +14,48 @@
     "chrome",
     "firefox"
   ],
-  "main": "webext-options-sync.js",
   "files": [
-    "webext-options-sync.js",
+    "index.js",
     "index.d.ts"
   ],
   "scripts": {
-    "watch": "onchange '*.js' --initial -- xo --fix",
-    "test": "xo"
+    "test": "xo && tsc",
+    "prepublish-only": "run-p --silent build",
+    "build:comment": "echo '// https://github.com/bfred-it/webext-options-sync\n'",
+    "build:standalone": "browserify source/index.ts --standalone OptionsSync -p tsify -p browser-pack-flat",
+    "build": "tsc --emitDeclarationOnly && run-s build:* --silent > webext-options-sync.js",
+    "watch": "tsc --watch"
   },
   "xo": {
+    "ignores": [
+      "webext-options-sync.js"
+    ],
+    "extensions": [
+      "ts"
+    ],
     "envs": [
       "browser",
       "webextensions"
     ],
-    "rules": {
-      "comma-dangle": [
-        0,
-        "only-multiline"
-      ]
-    }
+    "overrides": [
+      {
+        "files": "**/*.ts",
+        "extends": "xo-typescript"
+      }
+    ]
   },
   "devDependencies": {
-    "onchange": "^3.3.0",
+    "@sindresorhus/tsconfig": "^0.4.0",
+    "@types/chrome": "0.0.86",
+    "@types/dom-inputevent": "^1.0.4",
+    "@typescript-eslint/eslint-plugin": "^1.9.0",
+    "@typescript-eslint/parser": "^1.10.2",
+    "browser-pack-flat": "^3.4.2",
+    "browserify": "^16.2.3",
+    "eslint-config-xo-typescript": "^0.14.0",
+    "npm-run-all": "^4.1.5",
+    "tsify": "^4.0.1",
+    "typescript": "^3.5.1",
     "xo": "*"
   }
 }