Uncaught Error: Cannot find module './locale'

[ajayar]

After auto-updating to moment 2.25, am getting this error

prototype.js:1 Uncaught Error: Cannot find module './locale'
at prototype.js:1
at Module. (prototype.js:1)
at f ((index):1)
at moment-timezone.js:11
at Object. (moment-timezone.js:6)
at f ((index):1)
at Object. (index.js:1)
at f ((index):1)
at Module.1033 (network.js:27)
at f ((index):1)

[BrianSHenderson]

Same issue here

[RobUnderscore]

Same. Supposedly fixed by reverting moment to 2.24.0 -

moment/moment#4216

That didn't fix it for me.

[dylanjt]

Same issue here. This is currently breaking when built for our dev environment. Running locally appears to work fine. Using CRA-based app.

EDIT: I had installed moment-timezone, and was importing moment implicitly. I have attempted to explicitly install the 2.24.0 version, but that does not work.

EDIT: since this appears to be a pertinent point, I should note that our breakage is also occurring when deployed via CircleCI.

[jontybrook]

I'm having the same issue. Locking to 2.24 doesn't fix it for me either. Intriguingly i'm seeing this when our CI makes production builds, but not in local dev builds.

[RobUnderscore]

I'm having the same issue. Locking to 2.24 doesn't fix it for me either. Intriguingly i'm seeing this when our CI makes production builds, but not in local dev builds.

Same. In order to test locally I'm having to perform a production build locally and use serve or http-server to start it up.

Also using CRA.

[mike-ruane]

here's moment & moment-timezone in my package.json:

"moment": "^2.22.2",
"moment-timezone": "^0.5.23",

It's a react typescript app, with corresponding types for moment-timezone "@types/moment-timezone": "^0.5.9". yarn install now returns import errors on moment. I've bumped moment version down to 2.22.1, which solved this issue, but then introduced the locale issue mentioned above. I get the following error in react-scripts-ts build:

./node_modules/moment-timezone/node_modules/moment/src/lib/locale/locales.js
78:12-82:13 Critical dependency: the request of a dependency is an expression

This is since yesterday, as this build ran successfully on master branch CI then.

[spacejamtda]

I previously only had moment-timezone as a dependency but the following worked for me after adding the following to package.json

"dependencies": {
    "moment": "2.24.0",
    "moment-timezone": "0.5.28"
},
"resolutions": {
    "moment": "2.24.0"
}

[dylanjt]

@spacejamtda thank you, this got our dev env back online.

[jontybrook]

In my case I was finally able to resolve this by adding

"resolutions": { "moment": "2.24.0" }

to package.json, and also modifying yarn.lock. I'm using a lerna monorepo and yarn workspaces, so I had to add this to the root package.json so that the resolution prevented yarn from installing 2.25.0 where ^ is used.

Sincerely hope this issue is fixed in moment soon!

[ajayar]

@spacejamtda thx. Your solution fixed it for the time being. I'm using CRA, the local builds work fine but the production ones fail.

[kkerley]

I was having this problem suddenly and the way I ultimately fixed it for both local dev and remote prod was to implement @spacejamtda's suggestion (I don't use moment-timezone, though). My package.json did not have the "resolutions" part. I also deleted my package-lock.json file and node_modules directory, reinstalled, and then everything worked.

[agrohs]

I tried the resolution above from @spacejamtda but no luck...we are desperate after fighting this issue all day since 2.25 was released

[DaveCole]

The rollback on #5472 from @miguelmota did it for me:

npm install --save --save-exact moment@2.24.0

That's the last time I do a package update on a Friday afternoon before a launch :)

[vitaliyhayda]

same issue

[nikunjkonduru]

I think the @spacejamtda resolutions solution probably works for for people using yarn. I am not sure npm supports resolutions out of the box. I read about npm-force-resolutions, but having problem implementing it.

[vitaliyhayda]

Until moment fixes the issue - feel free to use my fork with a locked moment version:

npm install --save vitaliyhayda/moment-timezone

[agrohs]

I tried the resolution above from @spacejamtda but no luck...we are desperate after fighting this issue all day since 2.25 was released

Quick update that this was related to monorepo/yarn workspaces and it just requires the resolutions to be placed in the root level package.json:

  "resolutions": {
    "**/moment": "2.24.0"
  }

[drummy2]

Adding the resolutions in your package is only a plaster on a bleeding wound. When is there going to be a final fix?

[ichernev]

I'm a bit confused here, what exactly is the issue with moment and how should we fix it? Would peerDependency work?