try c8

c8rc.json

@@ -0,0 +1,8 @@
+{
+  "extension": [".ts"],
+  "include": ["src/**/*.ts"],
+  "exclude": ["**/*.test.ts"],
+  "reporter": ["html", "text", "lcov"],
+  "all": true,
+  "require": ["ts-node/register"]
+}

package.json

@@ -12,7 +12,7 @@
     "build": "tsc",
     "dev": "ts-node-dev --respawn src/index.ts | pino-pretty --singleLine --colorize --ignore time,hostname,ip",
     "start": "node dist/index.js",
-    "start:coverage": "pm2 start --name relayer 'nyc node -r ts-node/register src/index.ts' && ./scripts/health-check.sh",
+    "start:coverage": "pm2 start --name relayer 'c8 node -r ts-node/register src/index.ts' && ./scripts/health-check.sh",
     "stop:coverage": "pm2 stop relayer && pm2 delete relayer",
     "start:test-infra": "docker compose up",
     "test": "vitest src/__tests__/*.test.ts --singleThread --run",
@@ -32,6 +32,7 @@
     "@polkadot/api": "^10.9.1",
     "axios": "^0.26.1",
     "bech32": "^2.0.0",
+    "c8": "^10.1.2",
     "cors": "^2.8.5",
     "dotenv": "^16.0.3",
     "envalid": "^8.0.0",