Bun: error: Cannot find module './utils' from '/path/to/index.ts'

error: Cannot find module './utils' from '/path/to/index.ts' means Bun could not resolve an import. The first quoted part is the import exactly as written; the second is the file that contains it. For relative imports the path is resolved from that file's folder, so ./utils must exist next to it as utils.ts, utils.js, utils/index.ts or similar. For a package name, install it with bun add.

Reproduce it

echo 'import { greet } from "./missing"; greet();' > index.ts
npx --yes bun@1 run index.ts 2>&1 | head -1
exit "${PIPESTATUS[0]}"

error: Cannot find module './missing' from '/tmp/work/index.ts'

Bun also prints its version and platform below the error.

Fix

echo 'export function greet() { console.log("hello"); }' > missing.ts
echo 'import { greet } from "./missing"; greet();' > index.ts
npx --yes bun@1 run index.ts

hello

For a package, the same message names the package: Cannot find module 'zod' from '/app/src/index.ts'. Run bun add zod and run the file again.

Running a file that does not exist at all (bun run nofile.ts) gives a different message: error: Module not found "nofile.ts".