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error TS2307: Cannot find module TypeScript fails the build.

A production build checks types. A type error stops it, even if the app runs in dev mode. Run the type check on your machine and fix what it reports.

How the Agent API works
What you see
src/app/page.tsx:12:20
error TS2307: Cannot find module '@/lib/db' or its corresponding type
declarations.
Type error: Cannot find module '@/lib/db' or its corresponding type
declarations.
  • What it meansThe type check found an error
  • Test it locallyRun npx tsc --noEmit
  • The fixFix each reported error
  • Why dev worksDev mode does not check everything

What it means

TypeScript checks your code for mistakes before it is built. In development, tools like next dev and vite dev skip or soften that check, so the app can run with errors. A production build treats type errors as failures. The build says the same: type errors fail the build even when the app runs locally with next dev.

How to fix it

  1. Run the type check on your machine

    Run npx tsc --noEmit. It lists every type error with its file and line, without building anything.

  2. Fix each error

    Ask your agent: "Fix all TypeScript errors that npx tsc --noEmit reports." Fix the cause, not the symptom.

  3. Run the production build locally

    Run npm run build. When it passes locally, deploy again. A failed deploy never counts against your plan.

Errors you will often see

  • TS2307, Cannot find module. A path alias such as @/lib/db is not set in tsconfig.json, the file does not exist, or a @types package is missing.
  • TS7006, implicit any. A parameter has no type and strict mode is on.
  • TS6133, declared but never used. A variable or import is unused and noUnusedLocals is on.
  • TS2322, type not assignable. A value does not match the type it is given.

01Questions

TypeScript questions, answered.

Anything else? Write to us and a person answers.

support@antideploy.com
Can I turn the type check off?

Some tools let you ignore build errors, for example ignoreBuildErrors in the Next.js config. That ships the errors to production, so it is better to fix them.

Why does it work with next dev?

Development mode compiles pages as you open them and does not fail on every type error.

Does this failed deploy cost anything?

No. Failed deploys never count against your plan.

+Keep reading

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Each platform page covers one part of Antideploy: what it does, where it stops and the questions people ask. See the whole platform, or all the guides.

Facts on this page were checked against the live platform on 7 October 2026.

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