chore: cleanup dependencies & shrink rollup config

package.json

@@ -36,19 +36,13 @@
   "homepage": "https://github.com/iden3/ffjs#readme",
   "dependencies": {
     "big-integer": "^1.6.48",
-    "mocha": "^8.2.1",
-    "wasmcurves": "0.0.14",
-    "worker-threads": "^1.0.0"
+    "wasmcurves": "0.0.14"
   },
   "devDependencies": {
     "blake2b": "^2.1.3",
     "chai": "^4.2.0",
     "eslint": "^6.8.0",
-    "esm": "^3.2.25",
-    "rollup": "^2.19.0",
-    "rollup-plugin-commonjs": "^10.1.0",
-    "rollup-plugin-node-builtins": "^2.1.2",
-    "rollup-plugin-node-globals": "^1.4.0",
-    "rollup-plugin-node-resolve": "^5.2.0"
+    "mocha": "^8.2.1",
+    "rollup": "^2.38.5"
   }
 }

rollup.cjs.config.js

@@ -1,5 +1,7 @@
-import resolve from "rollup-plugin-node-resolve";
-import commonJS from "rollup-plugin-commonjs";
+import fs from "fs";
+import { builtinModules as builtin } from "module";
+
+const pkg = JSON.parse(fs.readFileSync("./package.json"));
 
 export default {
     input: "main.js",
@@ -7,12 +9,8 @@ export default {
         file: "build/main.cjs",
         format: "cjs",
     },
-    external: ["crypto", "os", "worker_threads"],
-    plugins: [
-        resolve({ preferBuiltins: true }),
-        commonJS({
-            preserveSymlinks: true
-        }),
+    external: [
+        ...Object.keys(pkg.dependencies),
+        ...builtin,
     ]
 };
-