Schema must contain uniquely named types but contains multiple types named "ID".

[sibelius]

Reporting issues with GraphQL.js

Related problem #2439

When we compile our node server using babel, the node server works well

however, when we bundle the node server using webpack, it throws this error

Error: Schema must contain uniquely named types but contains multiple types named "ID"

I've tracked down as the collectReferencedTypes (

graphql-js/src/type/schema.ts

Line 193 in 69e1554

collectReferencedTypes(type, allReferencedTypes);

) is adding twice the GraphQLScalarType ID

we use graphql-js and graphql-relay, we ensure we only have 1 version of them in our monorepo

we have many schemas in our monorepo (7 schemas)

We also tried to understand if GraphQLScalarType ID was being called twice, but it was only once

what is the best way to understand and debug this kind of bug?

graphql@16.5.0
graphql-relay@0.7.0

[sibelius]

node + babel consume .js files
webpack consumes .mjs files

[sibelius]

I had an import like this

import { GraphQLID } from 'graphql/type/scalars';

moving to

import { GraphQLID } from 'graphql';

solved the problem