Firebase-tools: Cannot start emulator

Sounds like the emulator may have failed to install when you installed firebase-tools (it's an optional dependency, so it's possible). Could you try re-running npm install -g firebase-tools and inspect the output to confirm @google-cloud/functions-emulator got pulled in with it?

Ping? Would love to hear back from you or we'll close for inactivity

I did the same thing, I installed and reinstalled the modules to no avail.

➜ firebase serve --only functions

=== Serving from ''...

⚠ functions: Cannot start emulator. Error: Cannot find module '@google-cloud/functions-emulator/src/config'
➜ npm install -g firebase-tools
npm WARN deprecated [email protected]: Use uuid module instead
/home//.npm-global/bin/firebase -> /home//.npm-global/lib/node_modules/firebase-tools/bin/firebase

• [email protected]
  updated 1 package in 89.04s
  => firebase serve --only functions

=== Serving from ''...

⚠ functions: Cannot start emulator. Error: Cannot find module '@google-cloud/functions-emulator/src/config'

Same here. Been this way for a few days. Even after the update today.

@danielsada and @raelmiu Can you try:

npm uninstall -g firebase-tools && npm i -g firebase-tools

Did it, some of the notable warnings:
node-pre-gyp ERR! Tried to download(403): https://storage.googleapis.com/grpc-precompiled-binaries/node/grpc/v1.4.1/node-v59-linux-x64.tar.gz node-pre-gyp ERR! Pre-built binaries not found for [email protected] and [email protected] (node-v59 ABI) (falling back to source compile with node-gyp) make: Entering directory '/home/danielsada/.npm-global/lib/node_modules/firebase-tools/node_modules/grpc/build'
Then

`> @google-cloud/[email protected] postinstall /home//.npm-global/lib/node_modules/firebase-tools/node_modules/@google-cloud/functions-emulator

node scripts/upgrade-warning`

Then finally, the same error

I'm getting the same error. Have tried uninstalling and reinstalling.

Did anyone got this working ?. Still getting the same error.

Same here. Installed node 6.11, reinstalled tools, still doesn't work.

Can replicate in v3.17.2

Hi everyone, can you try v3.17.3? @Mir-Ansar yours looks to be a permission error, here's info on how to fix: https://docs.npmjs.com/getting-started/fixing-npm-permissions

I tried .3 and .2 and I get the same error :(

Is there any solution for this?

Sorry I can't reproduce the issue, it sounds like it is similar to https://github.com/GoogleCloudPlatform/cloud-functions-emulator/issues/170#issue-278096938. So you may want to +1 that issue.

Other things you can try are:

• upgrading npm, and then uninstall, reinstall

npm i -g npm
npm unintall -g firebase-tools && npm i -g firebase-tools

I have the same exact issue, tried most given solutions, nothing worked. Anyone got a solution in the meantime?

https://github.com/grpc/grpc/issues/13673

I'm getting the same error

I am not sure what exactly is causing this problem. But here is the working solution for this problem. StackOverflow - Firebase: Cannot start emulator

npm install -g @google-cloud/functions-emulator fixed this for me.

@RyanNewsom didn't solve it for me. Still broken.

Any working solution? My emulator was working but now it isn't

I have a couple similar projects, one working, one not working per above comments, as well as a firebase deployment that was working - now inexplicably not working. With the number of people suffering from this same fate both here and on stackOverflow over a period of many months, it would seem that a less brittle system might be in order.

reason for this problem is in most cases a wrong python version when installing firebase.

make sure you are using a shell with python 2 and then re-run:
npm install -g firebase-tools

The latest firebase-tools (v3.17.5) removes grpc as a dependency, which should resolve these issues. Please upgrade by running npm i -g firebase-tools

Fixed it for me.

got the same issue when you have different node version than the node engine in package.json
solution:

below is yarn, feel free to use npm

# install current working directory dependencies
yarn --ignore-engines

# install firebase-tools if u didn't
yarn global add firebase-tools

# install functions-emulator
yarn global add @google-cloud/functions-emulator --ignore-engines

⚠  functions: Cannot start emulator. Error: Cannot find module '@google-cloud/functions-emulator/src/config'
(node:15281) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'exit' of undefined
    at /usr/local/lib/node_modules/firebase-tools/lib/command.js:82:34
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:15281) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:15281) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Tried @ddo methods but didn't work.

⚠  functions: Cannot start emulator. Error: Cannot find module '@google-cloud/functions-emulator/src/config'
(node:15281) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'exit' of undefined
    at /usr/local/lib/node_modules/firebase-tools/lib/command.js:82:34
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:15281) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:15281) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Tried @ddo methods but didn't work.

Worked, after I:

1. Reinstall Node & NPM using NVM
2. delete firebase-tools on /usr/local/lib/node_modules (Or previous global package installed from root-level node)
3. install firebase-tools without sudo (npm i -g firebase-tools)

sdfsdfadf

i also had recently upgraded to using node 8 and had issues with firebase serve --only functions and firebase-tools not willing to fully install @google-cloud/[email protected]: The engine "node" is incompatible with this module. Expected version "~6". Got "8.1.0", but --ignore-engines is really helpful - now it runs fine, though gives a warning

[Jest Dev server] $ firebase serve --only functions -p 5000 -o 0.0.0.0
[Jest Dev server]
[Jest Dev server] === Serving from '/Users/xxx/project-name'...
[Jest Dev server]
[Jest Dev server] i  functions: Preparing to emulate functions.
[Jest Dev server] Warning: You're using Node.js v8.1.0 but Google Cloud Functions only supports v6.11.5.

problem resolved, I just simply stop using firebase. That's it.

On Wed, Nov 14, 2018 at 1:03 AM rilian notifications@github.com wrote:

i also had recently upgraded to using node 8 and had issues with firebase
serve --only functions and firebase-tools not willing to fully install
@google-cloud/[email protected]: The engine "node" is
incompatible with this module. Expected version "~6". Got "8.1.0", but
--ignore-engines is really helpful - now it runs fine, though gives a
warning

[Jest Dev server] $ firebase serve --only functions -p 5000 -o 0.0.0.0
[Jest Dev server]
[Jest Dev server] === Serving from '/Users/xxx/project-name'...
[Jest Dev server]
[Jest Dev server] i functions: Preparing to emulate functions.
[Jest Dev server] Warning: You're using Node.js v8.1.0 but Google Cloud Functions only supports v6.11.5.

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save me:
yarn global remove @google-cloud/functions-emulator
yarn global add https://github.com/GoogleCloudPlatform/cloud-functions-emulator#master

I just had this issue after upgrading firebase-admin and some other firebase packages, too. I am running functions on node 8. I was able to fix the issue by ensuring that I installed firebase with --ignore-engines

If you are primarily using yarn in your project, use npm instead of yarn when installing firebase-tools.

yarn global remove firebase-tools
npm i - g firebase-tools

Worked for me: I was running into this problem inside docker on mac. Nothing fixed it. Ended up installing it on mac, then copying it in docker's node_modules. That worked.

Also having the above issue after migration to node 8 functions. Using, --ignore-engines as mentioned, although I still get this warning:

Warning: You're using Node.js v8.14.0 but Google Cloud Functions only supports v6.11.5.

@Dygerati same for me.

This is what I get, anyone solved this issue?

functions: Cannot start emulator. Error: Cannot find module './acceleratedmobilepageurl/v1'
(node:16724) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'exit' of undefined
    at C:\....\node_modules\firebase-tools\lib\command.js:82:34
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:16724) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rej
ection id: 2)
(node:16724) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

npm install @google-cloud/functions-emulator --save-dev solved for me

Okay so the the google cloud-functions-emulator "only supports Node v6.x.x. It does not support Node v8.x.x"
https://github.com/GoogleCloudPlatform/cloud-functions-emulator#note

The firebase docs on choosing node versions says you can use node 8 "engines": {"node": "8"}
but its in beta..
https://firebase.google.com/docs/functions/manage-functions#set_nodejs_version

hmmm... so i can use node8, but i cannot test it locally using cloud functions shell (if i use node8 specific syntax)?
Do i have this right?

Firebase Team/Google Team, it would be helpful if you would put in the docs that the cloud functions emulator will not work with node 8
for example on this page, https://firebase.google.com/docs/functions/manage-functions#set_nodejs_version have something like

"you can set your runtime to node 8, but if you test with google cloud-functions-emulator it will be using node6.x.x and any node8 specific syntax will not work "

a similar warning here would help
https://firebase.google.com/docs/functions/local-emulator#install_and_configure_the_cloud_functions_shell

also in the email you sent out (25 Feb 2019)
subject: [Action required] Changes to runtimes for new Cloud Functions deployments from April 1

I got here with the exact same question as @julianorinyol - is there a plan for getting the emulator to the point where it is compatible with Node 8 syntax?

using on node 8 (with yarn) this is what worked for me:
yarn add @google-cloud/functions-emulator --ignore-engines