Add register script

package.json

@@ -13,10 +13,8 @@
     "lib/**/*.js",
     "lib/**/*.js.map",
     "lib/**/*.d.ts",
-    "blst-native.*",
-    "browser.*",
-    "herumi.*",
-    "node."
+    "*.d.ts",
+    "*.js"
   ],
   "keywords": [
     "ethereum",

register.js

@@ -0,0 +1,14 @@
+const {init} = require("./lib");
+
+// -----------------------------------------
+// To be used in NodeJS testing environments
+// node -r @chainsafe/bls/register
+// -----------------------------------------
+
+// blst-native initialization is syncronous
+// Initialize bls here instead of in before() so it's available inside describe() blocks
+init("blst-native").catch((e) => {
+  // eslint-disable-next-line no-console
+  console.error(e);
+  process.exit(1);
+});