diff --git a/testcases/test-env/ts-import-cjs-node16/package.json b/testcases/test-env/ts-import-cjs-node16/package.json
index ba29eff90..22dececb3 100644
--- a/testcases/test-env/ts-import-cjs-node16/package.json
+++ b/testcases/test-env/ts-import-cjs-node16/package.json
@@ -14,6 +14,7 @@
   "scripts": {
     "build": "tsc --project tsconfig.json",
     "clean": "rm -rf node_modules package-lock.json *.js *.d.ts",
+    "postinstall": "find node_modules | grep package.json",
     "test": "npm run build && node index.js"
   },
   "license": "MIT"
diff --git a/testcases/test-env/ts-import-cjs/package.json b/testcases/test-env/ts-import-cjs/package.json
index ba29eff90..22dececb3 100644
--- a/testcases/test-env/ts-import-cjs/package.json
+++ b/testcases/test-env/ts-import-cjs/package.json
@@ -14,6 +14,7 @@
   "scripts": {
     "build": "tsc --project tsconfig.json",
     "clean": "rm -rf node_modules package-lock.json *.js *.d.ts",
+    "postinstall": "find node_modules | grep package.json",
     "test": "npm run build && node index.js"
   },
   "license": "MIT"
diff --git a/testcases/test-env/ts-import-esm-node16/package.json b/testcases/test-env/ts-import-esm-node16/package.json
index e9e52dd7f..93223e2c4 100644
--- a/testcases/test-env/ts-import-esm-node16/package.json
+++ b/testcases/test-env/ts-import-esm-node16/package.json
@@ -17,6 +17,7 @@
   "scripts": {
     "build": "tsc --project tsconfig.json",
     "clean": "rm -rf node_modules package-lock.json *.js *.d.ts",
+    "postinstall": "find node_modules | grep package.json",
     "test": "npm run build && node index.js"
   },
   "keywords": [
diff --git a/testcases/test-env/ts-import-esm/package.json b/testcases/test-env/ts-import-esm/package.json
index e9e52dd7f..93223e2c4 100644
--- a/testcases/test-env/ts-import-esm/package.json
+++ b/testcases/test-env/ts-import-esm/package.json
@@ -17,6 +17,7 @@
   "scripts": {
     "build": "tsc --project tsconfig.json",
     "clean": "rm -rf node_modules package-lock.json *.js *.d.ts",
+    "postinstall": "find node_modules | grep package.json",
     "test": "npm run build && node index.js"
   },
   "keywords": [