I can't seem to import local modules

I am trying to import local modules but I get an error

Current versus Expected behavior

Here's the error:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/var/task/api/openai' imported from /var/task/api/routes/aiRoutes.js
    at finalizeResolution (node:internal/modules/esm/resolve:269:11)
    at moduleResolve (node:internal/modules/esm/resolve:937:10)
    at moduleResolveWithNodePath (node:internal/modules/esm/resolve:1173:14)
    at defaultResolve (node:internal/modules/esm/resolve:1216:79)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:540:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:509:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:239:38)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:96:40)
    at link (node:internal/modules/esm/module_job:95:36) {
  code: 'ERR_MODULE_NOT_FOUND',
  url: 'file:///var/task/api/openai'
}
Node.js process exited with exit status: 1. The logs above can help with debugging the issue.
INIT_REPORT Init Duration: 240.76 ms	Phase: invoke	Status: error	Error Type: Runtime.ExitError

I would expect it to act normal and import the dang module

Code, configuration, and steps that reproduce this issue

Here's the code it doesn't like:

import { setupAIRoutes } from './routes/aiRoutes.js';
import { setupLicenseRoutes } from './routes/licenseRoutes.js';

Here's the vercel.json file (I tried adding the imports to the bundle it didn't help):

{
  "rewrites": [
    {
      "source": "/api/(.*)",
      "destination": "/api"
    }
  ],
  "redirects": [
    { "source": "/", "destination": "/api", "permanent": false }
  ],
  "functions": {
    "api/index.js": {
      "includeFiles": "api/**"
    }
  }
}

Here's package.json

{
  "type": "module",
  "engines": {
    "node": "20.x"
  },
  "scripts": {
    "start": "vercel dev",
    "deploy": "vercel"
  },
  "dependencies": {
    "@ai-sdk/openai": "^0.0.58",
    "@hono/node-server": "^1.12.2",
    "ai": "^3.3.34",
    "hono": "^4.4.2",
    "openai": "^4.59.0",
    "zod": "^3.23.8"
  },
  "devDependencies": {
    "vercel": "^32.4.1"
  }
}

Project information

Deployment URL: https://vercel.com/geoidesics-projects/actor-studio-openai/DWAzrWceD272QMM6Jjra3reFsiPZ
Environment (local, preview, production): production
Project Framework: Hono
Build Settings:
  Framework Preset: Hono (https://vercel.com/templates/hono/hono-on-vercel)
  Build Command (if not default): vercel --prod
  Output Directory (if not default):
  Install Command (if not default): 
Node/Runtime Version: 20.x
Package Manager: yarn
Relevant Packages: see package.json above

Hey . I have a working example app based on the Hono on Vercel starter, but with local files imported. It's an overly simple example, but it might help as a reference point.

https://github.com/amyegan/hono-1270

GitHub

GitHub - amyegan/hono-1270

Contribute to amyegan/hono-1270 development by creating an account on GitHub.

Deployment URL: hono-1270-kk9wy4suq-amy-vtest314.vercel.app
Project Framework: Hono
Build Settings:
  Framework Preset: Other
  Build Command (if not default): 
  Output Directory (if not default):
  Install Command (if not default): 
Node/Runtime Version: 20.x

Thanks. It looks identical to mine. Still mystified why it won't work for me. The only difference is that I'm trying to include from a subfolder whereas you're including from the root folder or current module.

I tried moving one of the local imports to a subdirectory within API, and worked in my example app.

Deployment: hono-1270-oj5wy0ioe-amy-vtest314.vercel.app Commit: https://github.com/amyegan/hono-1270/commit/2fc5d107f7e561136d554543264f6551ea18f023

GitHub

Move to sub-directory · amyegan/hono-1270@2fc5d10

Contribute to amyegan/hono-1270 development by creating an account on GitHub.

Another difference I noticed is my project does not include functions configuration in the vercel.json file. Does it make a difference for your project if you change that?

No, it does not. I added that in an attempt to fix the error. Tomorrow I will try use your project as a starting point and see if I can morph it back into my project while retaining the import ability. Thank you for your efforts to help me with my query!

It was down to other imports not including the .js extension in the import path.

I am trying to import local modules but I get an error

Current versus Expected behavior

Here's the error:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/var/task/api/openai' imported from /var/task/api/routes/aiRoutes.js
    at finalizeResolution (node:internal/modules/esm/resolve:269:11)
    at moduleResolve (node:internal/modules/esm/resolve:937:10)
    at moduleResolveWithNodePath (node:internal/modules/esm/resolve:1173:14)
    at defaultResolve (node:internal/modules/esm/resolve:1216:79)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:540:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:509:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:239:38)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:96:40)
    at link (node:internal/modules/esm/module_job:95:36) {
  code: 'ERR_MODULE_NOT_FOUND',
  url: 'file:///var/task/api/openai'
}
Node.js process exited with exit status: 1. The logs above can help with debugging the issue.
INIT_REPORT Init Duration: 240.76 ms	Phase: invoke	Status: error	Error Type: Runtime.ExitError

I would expect it to act normal and import the dang module

Code, configuration, and steps that reproduce this issue

Here's the code it doesn't like:

import { setupAIRoutes } from './routes/aiRoutes.js';
import { setupLicenseRoutes } from './routes/licenseRoutes.js';

Here's the vercel.json file (I tried adding the imports to the bundle it didn't help):

{
  "rewrites": [
    {
      "source": "/api/(.*)",
      "destination": "/api"
    }
  ],
  "redirects": [
    { "source": "/", "destination": "/api", "permanent": false }
  ],
  "functions": {
    "api/index.js": {
      "includeFiles": "api/**"
    }
  }
}

Here's package.json

{
  "type": "module",
  "engines": {
    "node": "20.x"
  },
  "scripts": {
    "start": "vercel dev",
    "deploy": "vercel"
  },
  "dependencies": {
    "@ai-sdk/openai": "^0.0.58",
    "@hono/node-server": "^1.12.2",
    "ai": "^3.3.34",
    "hono": "^4.4.2",
    "openai": "^4.59.0",
    "zod": "^3.23.8"
  },
  "devDependencies": {
    "vercel": "^32.4.1"
  }
}

Project information

Deployment URL: https://vercel.com/geoidesics-projects/actor-studio-openai/DWAzrWceD272QMM6Jjra3reFsiPZ
Environment (local, preview, production): production
Project Framework: Hono
Build Settings:
  Framework Preset: Hono (https://vercel.com/templates/hono/hono-on-vercel)
  Build Command (if not default): vercel --prod
  Output Directory (if not default):
  Install Command (if not default): 
Node/Runtime Version: 20.x
Package Manager: yarn
Relevant Packages: see package.json above

Hey . I have a working example app based on the Hono on Vercel starter, but with local files imported. It's an overly simple example, but it might help as a reference point.

https://github.com/amyegan/hono-1270

GitHub

GitHub - amyegan/hono-1270

Contribute to amyegan/hono-1270 development by creating an account on GitHub.

Deployment URL: hono-1270-kk9wy4suq-amy-vtest314.vercel.app
Project Framework: Hono
Build Settings:
  Framework Preset: Other
  Build Command (if not default): 
  Output Directory (if not default):
  Install Command (if not default): 
Node/Runtime Version: 20.x

I tried moving one of the local imports to a subdirectory within API, and worked in my example app.

Deployment: hono-1270-oj5wy0ioe-amy-vtest314.vercel.app Commit: https://github.com/amyegan/hono-1270/commit/2fc5d107f7e561136d554543264f6551ea18f023

GitHub

Move to sub-directory · amyegan/hono-1270@2fc5d10

Contribute to amyegan/hono-1270 development by creating an account on GitHub.

Another difference I noticed is my project does not include functions configuration in the vercel.json file. Does it make a difference for your project if you change that?

It was down to other imports not including the .js extension in the import path.