feat: Add typings to npm package

Author: roninjin10

package.json

@@ -36,8 +36,11 @@
   },
   "files": [
     "common/*.js",
+    "common/*.d.ts",
     "bindings/*.js",
-    "*.js"
+    "bindings/*.d.ts",
+    "*.js",
+    "*.d.ts"
   ],
   "author": "chriseth",
   "license": "MIT",

tsconfig.json

@@ -9,6 +9,7 @@
     // TODO: Drop it in the next breaking release.
     "esModuleInterop": true,
     "outDir": "./dist",
+    "declaration": true,
     "forceConsistentCasingInFileNames": true,
     // Allow JS must be included to ensure that the built binary is included
     // in the output. This could be copied directly in the future if required.