firebase functions:shell - Port 5000 is not open, could not start functions emulator

[REQUIRED] Environment info

firebase-tools: 7.2.2

Platform: macOS

[REQUIRED] Test case

firebase functions:shell

[REQUIRED] Steps to reproduce

1. $ npm install -g firebase-tools
2. $ npm install firebase-functions@latest firebase-admin@latest --save
3. firebase functions:shell

[REQUIRED] Expected behavior

firebase shell runs as advertised

[REQUIRED] Actual behavior

CLI Output: Port 5000 is not open, could not start functions emulator. firebase-debug.log

[debug] [2019-08-18T03:02:45.322Z] ----------------------------------------------------------------------
[debug] [2019-08-18T03:02:45.324Z] Command:       /usr/local/bin/node /usr/local/bin/firebase functions:shell
[debug] [2019-08-18T03:02:45.324Z] CLI Version:   7.2.2
[debug] [2019-08-18T03:02:45.324Z] Platform:      darwin
[debug] [2019-08-18T03:02:45.324Z] Node Version:  v10.15.3
[debug] [2019-08-18T03:02:45.330Z] Time:          Sat Aug 17 2019 23:02:45 GMT-0400 (Eastern Daylight Time)
[debug] [2019-08-18T03:02:45.330Z] ----------------------------------------------------------------------
[debug] 
[2019-08-18T03:04:19.141Z] > 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"]
[2019-08-18T03:04:19.141Z] > authorizing via signed-in user
[2019-08-18T03:04:19.142Z] [iam] checking project ddme-329f1 for permissions ["firebase.projects.get"]
[2019-08-18T03:04:19.143Z] >>> HTTP REQUEST POST https://cloudresourcemanager.googleapis.com/v1/projects/ddme-329f1:testIamPermissions
 permissions=[firebase.projects.get]
[2019-08-18T03:04:24.132Z] <<< HTTP RESPONSE 200 content-type=application/json; charset=UTF-8, vary=X-Origin, Referer, Origin,Accept-Encoding, date=Sun, 18 Aug 2019 03:04:23 GMT, server=ESF, cache-control=private, x-xss-protection=0, x-frame-options=SAMEORIGIN, x-content-type-options=nosniff, server-timing=gfet4t7; dur=111, alt-svc=quic=":443"; ma=2592000; v="46,43,39", accept-ranges=none, transfer-encoding=chunked

Error: Port 5000 is not open, could not start functions emulator.

[Jank1310]

Seems to be related to the new portfinder release. https://github.com/http-party/node-portfinder/issues/84

The code used by the emulator fails with the latest version (1.0.22):

await pf.getPortPromise({ port, stopPort: port });

A workaround could be (besides using the old 1.0.21 version) :

await pf.getPortPromise({ port, stopPort: port + 1 });

QuickFix Edit the file firebase-tools/lib/emulator/controller.js in node_modules and change yield pf.getPortPromise({ port, stopPort: port }) to yield pf.getPortPromise({ port, stopPort: port + 1 })

There is an open pull request which fixes this “bug”: https://github.com/http-party/node-portfinder/pull/86

[micksatana]

In case someone want to find global node_modules to apply the quick fix. you can run npm root -g to see where your global node_modules are.