Add tsconfig.json and types for node as well as typescript

.gitignore

@@ -1,4 +1,5 @@
 coverage
+dist
 node_modules
 .nyc_output
 npm-debug.log

package.json

@@ -47,6 +47,7 @@
     "wif": "^2.0.1"
   },
   "devDependencies": {
+    "@types/node": "^10.12.18",
     "bip39": "^2.3.0",
     "bip65": "^1.0.1",
     "bip68": "^1.0.3",
@@ -58,7 +59,8 @@
     "mocha": "^5.2.0",
     "nyc": "^11.8.0",
     "proxyquire": "^2.0.1",
-    "standard": "^11.0.1"
+    "standard": "^11.0.1",
+    "typescript": "^3.2.2"
   },
   "license": "MIT"
 }

tsconfig.json

@@ -0,0 +1,27 @@
+{
+  "compilerOptions": {
+    "target": "ES2015",
+    "module": "commonjs",
+    "outDir": "./dist",
+    "rootDir": "./",
+    "types": [
+      "node"
+    ],
+    "allowJs": true,
+    "strict": false,
+    "noImplicitAny": false,
+    "strictNullChecks": false,
+    "strictFunctionTypes": false,
+    "strictBindCallApply": false,
+    "strictPropertyInitialization": false,
+    "noImplicitThis": false,
+    "alwaysStrict": false,
+    "esModuleInterop": true
+  },
+  "include": [
+      "src/**/*"
+  ],
+  "exclude": [
+      "**/*.spec.ts"
+  ]
+}