I deployed express app to Vercel.
I’m using mssql library to connect MSSQL.
I tested my express app on my local and it works fine.
But after deploy to vercel, I see this error.
Cannot find module ‘@azure/identity’
Require stack:

• /var/task/server/node_modules/tedious/lib/connection.js
• /var/task/server/node_modules/tedious/lib/tedious.js
• /var/task/server/node_modules/mssql/lib/tedious/connection-pool.js
• /var/task/server/node_modules/mssql/lib/tedious/index.js
• /var/task/server/node_modules/mssql/index.js
• /var/task/server/src/app.js
• /var/task/server/index.js
• /var/task/___now_launcher.js
• /var/runtime/index.mjs
  Did you forget to add it to “dependencies” in package.json?
  INIT_REPORT Init Duration: 223.72 ms Phase: init Status: error Error Type: Runtime.ExitError
  Cannot find module ‘@azure/identity’
  Require stack:
• /var/task/server/node_modules/tedious/lib/connection.js
• /var/task/server/node_modules/tedious/lib/tedious.js
• /var/task/server/node_modules/mssql/lib/tedious/connection-pool.js
• /var/task/server/node_modules/mssql/lib/tedious/index.js
• /var/task/server/node_modules/mssql/index.js
• /var/task/server/src/app.js
• /var/task/server/index.js
• /var/task/___now_launcher.js
• /var/runtime/index.mjs
  Did you forget to add it to “dependencies” in package.json?
  INIT_REPORT Init Duration: 414.58 ms Phase: invoke Status: error Error Type: Runtime.ExitError
  Error: Runtime exited with error: exit status 1

Could you help me?

Also, I installed @azure/identity as well, but it didn’t effect.