Cannot read properties of undefined (reading 'mainFile')

[forgetso]

Describe the bug

When running netlify dev it crashes with node 20 and gives the error Warning: TypeError: Cannot read properties of undefined (reading 'mainFile')

netlify --version  
netlify-cli/17.26.0 linux-x64 node-v20.12.2

◈ Extracted function errorHandler from /home/chris/dev/prosopo/captcha-private/netlify/functions/errorHandler.zip.
undefined
 ›   Warning: TypeError: Cannot read properties of undefined (reading 'mainFile')
 ›       at FunctionsRegistry.registerFunction (file:///home/user/.nvm/versions/node/v20.12.2/lib/node_modules/netlify-cli/dist/lib/functions/registry.js:320:80)
 ›       at async file:///home/user/.nvm/versions/node/v20.12.2/lib/node_modules/netlify-cli/dist/lib/functions/registry.js:413:13
 ›       at async Promise.all (index 1)
 ›       at async FunctionsRegistry.scan (file:///home/user/.nvm/versions/node/v20.12.2/lib/node_modules/netlify-cli/dist/lib/functions/registry.js:374:32)
 ›       at async startFunctionsServer (file:///home/user/.nvm/versions/node/v20.12.2/lib/node_modules/netlify-cli/dist/lib/functions/server.js:279:5)
 ›       at async BaseCommand.dev (file:///home/user/.nvm/versions/node/v20.12.2/lib/node_modules/netlify-cli/dist/commands/dev/dev.js:138:31)
 ›       at async BaseCommand.parseAsync (/home/user/.nvm/versions/node/v20.12.2/lib/node_modules/netlify-cli/node_modules/commander/lib/command.js:935:5)
 ›       at async file:///home/user/.nvm/versions/node/v20.12.2/lib/node_modules/netlify-cli/bin/run.js:27:3

Main file is actually present on the function definition:

errorHandler NetlifyFunction {
  buildError: null,
  srcFiles: Set(0) {},
  blobsContext: {
    deployID: '0',
    edgeURL: 'http://localhost:33031',
    siteID: 'unlinked',
    token: '*****',
    uncachedEdgeURL: 'http://localhost:33031',
    primaryRegion: 'dev'
  },
  config: {
    functionsDirectory: '/home/user/dev/project/netlify/functions',
    functionsDirectoryOrigin: 'config',
    build: {
      environment: {},
      processing: [Object],
      services: {},
      base: undefined,
      functions: '/home/user/dev/project/netlify/functions'
    },
    dev: {
      targetPort: 8081,
      command: 'npm run -w @org/project start'
    },
    redirectsOrigin: 'config',
    functions: { '*': {} },
    plugins: [],
    headers: [],
    redirects: [ [Object], [Object], [Object] ]
  },
  directory: '/home/user/dev/project/netlify/functions',
  mainFile: '/home/user/dev/project/netlify/functions/errorHandler.zip',
  name: 'errorHandler',
  displayName: 'errorHandler',
  projectRoot: '/home/user/dev/project/packages/org-website',
  runtime: [Module: null prototype] {
    getBuildFunction: [AsyncFunction: getBuildFunction],
    invokeFunction: [AsyncFunction: invokeFunction],
    invokeFunctionDirectly: [AsyncFunction: invokeFunctionDirectly],
    name: 'js',
    onDirectoryScan: [AsyncFunction: onDirectoryScan]
  },
  timeoutBackground: 900,
  timeoutSynchronous: 10,
  settings: {
    baseDirectory: undefined,
    command: 'npm run -w @org/project start',
    frameworkPort: 8081,
    dist: '/home/user/dev/project/packages/org-website',
    framework: undefined,
    env: undefined,
    pollingStrategies: [],
    useStaticServer: false,
    clearPublishDirectory: undefined,
    plugins: undefined,
    port: 8888,
    jwtSecret: 'secret',
    jwtRolePath: 'app_metadata.authorization.roles',
    functions: '/home/user/dev/project/netlify/functions',
    functionsPort: 38299,
    frameworkHost: '127.0.0.1'
  },
  isBackground: false,
  schedule: undefined
}

Steps to reproduce

1. Run a netlify dev project with the above versions of node and netlify
2. Specify functions in netlify/functions after having built them with from TS using netlify functions:build --src ./src --functions ./functions

Configuration

[dev]
targetPort = 8081
command = "npm run start"

[functions]
directory = "netlify/functions"

Environment

npx envinfo --system --binaries --npmPackages netlify-cli --npmGlobalPackages netlify-cli

  System:
    OS: Linux 6.5 Ubuntu 22.04.4 LTS 22.04.4 LTS (Jammy Jellyfish)
    CPU: (8) x64 AMD FX(tm)-8350 Eight-Core Processor
    Memory: 14.28 GB / 31.30 GB
    Container: Yes
    Shell: 5.8.1 - /usr/bin/zsh
  Binaries:
    Node: 20.12.2 - ~/.nvm/versions/node/v20.12.2/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v20.12.2/bin/yarn
    npm: 10.5.0 - ~/.nvm/versions/node/v20.12.2/bin/npm
  npmGlobalPackages:
    netlify-cli: 17.26.0