The "path" argument must be of type string. Received undefined

[REQUIRED] Environment info

firebase-tools: 8.2.0

Platform: macOS

[REQUIRED] Steps to reproduce

When I run firebase deploy --only firestore:rules I get this error:

[debug] [2020-05-11T23:36:17.216Z] ----------------------------------------------------------------------
[debug] [2020-05-11T23:36:17.220Z] Command:       /usr/local/bin/firebase /Users/long1eu/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/bin/firebase deploy --only firestore:rules
[debug] [2020-05-11T23:36:17.220Z] CLI Version:   8.2.0
[debug] [2020-05-11T23:36:17.220Z] Platform:      darwin
[debug] [2020-05-11T23:36:17.221Z] Node Version:  v12.16.1
[debug] [2020-05-11T23:36:17.222Z] Time:          Tue May 12 2020 02:36:17 GMT+0300 (Eastern European Summer Time)
[debug] [2020-05-11T23:36:17.223Z] ----------------------------------------------------------------------
[debug] [2020-05-11T23:36:17.223Z] 
[debug] [2020-05-11T23:36:17.238Z] > command requires scopes: ["email","openid","https://www.googleapis.com/auth/cloudplatformprojects.readonly","https://www.googleapis.com/auth/firebase","https://www.googleapis.com/auth/cloud-platform"]
[debug] [2020-05-11T23:36:17.239Z] > authorizing via signed-in user
[debug] [2020-05-11T23:36:17.239Z] [iam] checking project yitnow-dac3d for permissions ["datastore.indexes.create","datastore.indexes.delete","datastore.indexes.list","datastore.indexes.update","firebase.projects.get"]
[debug] [2020-05-11T23:36:17.244Z] >>> HTTP REQUEST POST https://cloudresourcemanager.googleapis.com/v1/projects/yitnow-dac3d:testIamPermissions  
 {"permissions":["datastore.indexes.create","datastore.indexes.delete","datastore.indexes.list","datastore.indexes.update","firebase.projects.get"]}
[debug] [2020-05-11T23:36:18.174Z] <<< HTTP RESPONSE 200 {"content-type":"application/json; charset=UTF-8","vary":"X-Origin, Referer, Origin,Accept-Encoding","date":"Mon, 11 May 2020 23:36:18 GMT","server":"ESF","cache-control":"private","x-xss-protection":"0","x-frame-options":"SAMEORIGIN","x-content-type-options":"nosniff","server-timing":"gfet4t7; dur=821","alt-svc":"h3-27=\":443\"; ma=2592000,h3-25=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q049=\":443\"; ma=2592000,h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"","accept-ranges":"none","transfer-encoding":"chunked"}
[debug] [2020-05-11T23:36:18.289Z] TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined
    at validateString (internal/validators.js:117:11)
    at Object.join (path.js:1039:7)
    at Object.checkFunctionsSDKVersion [as fn] (/Users/long1eu/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/checkFirebaseSDKVersion.js:33:28)
    at Command.<anonymous> (/Users/long1eu/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/command.js:159:30)
    at Generator.next (<anonymous>)
    at fulfilled (/Users/long1eu/.cache/firebase/tools/lib/node_modules/firebase-tools/lib/command.js:5:58)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
[error] 
[error] Error: An unexpected error has occurred.

[long1eu]

I remove the functions from firebase.json and it works. Thank you so much

[samtstern]

@long1eu this looks a bit similar to #2112 even though I hope it’s not related. A few more questions:

• Do both firestore.rules and firestore.indexes.json exist in the same directory as your firebase.json file?
• Do you have a functions directory? If not can you run firebase init functions?