issue with last release 15.4.0

[elcssmouhsine]

when i upgraded to latest release 15.4.0

i get this error

Unable to resolve module ../polyfills/flatMap from node_modules/graphql/type/validate.js: ../polyfills/flatMap could not be found within the project.

[dagamo]

Same error, any solution ?

[IvanGoncharov]

@elcssmouhsine @dagamo Can you please check that node_module/graphql/package.json has 15.4.0 version?
In 15.4.0 type/validate.js doesn't import flatMap so it looks like you did a partial update.
Can you please remove node_modules and install it from scratch?

[mjgasior]

I am trying to rebuild this in Expo (React Native) and even after deleting the node_modlues I keep getting the same error for this package version. I had to return to 15.1.0.

[hcharley]

I've had this in my yarn project's package.json to avoid 15.4.0 problems:

deps: {},
...
devDeps: {},
...
 "resolutions": {
    "graphql": "15.3.0"
  },
...

[IvanGoncharov]

@elcssmouhsine @dagamo @mjgasior @Charlex Can't reproduce this issue, it looks like it's something React Native specific, can you please confirm?
Can you please create a sample repo so I can debug this issue?

[louisholley]

fwiw I was experiencing a similar issue with Expo/React Native but my error message was Unable to resolve "./rules/FieldsOnCorrectType" from "node_modules/graphql/validation/index.js". i tried 15.3.0 and was getting the same thing, but after updating expo-cli, removing node_modules, running npm i then expo r -c everything seems to be working again. this sort of thing seems to happen a lot with expo

[IvanGoncharov]

@louisholley Thanks for reporting it!
Now everything makes sense.

[chaiiplss]

I am still getting this type of error even after removing node_modules and cleaning the cache.

Error: Unable to resolve module ./rules/custom/NoDeprecatedCustomRule from node_modules/graphql/validation/index.js

Any help would be appreciated!

[BerMoh]

changing the graphql version from ^16.0.1 from to 15.4.0 make my nodejs work!
The error I've got was:
node_modules/graphql/utilities/extendSchema.js:597
return nodes.flatMap(
^
TypeError: nodes.flatMap is not a function

Thank you @IvanGoncharov for your help.