fix: Include TS type declarations. (#18)

Author: kinyoklion

.npmignore

@@ -4,3 +4,12 @@ coverage/
 reports/
 docs/
 src/
+.github/
+.circleci/
+.ldrelease/
+__tests__/
+reports/
+jest.config.js
+tsconfig.eslint.json
+.eslintrc.js
+tsconfig.json

tsconfig.json

@@ -8,6 +8,8 @@
     "sourceMap": true,
     "outDir": "dist",
     "rootDir": "./src",
+    "declaration": true,
+    "declarationMap": true // enables importers to jump to source
   },
   "lib": ["es2015"]
 }