'Ambiguos "Error: NEXUS__UNKNOWN__TYPE was already defined and imported as a type" error in nexus graphql

I'm getting the following error when using nexus to define a graphql schema with apollo-server.

Error: NEXUS__UNKNOWN__TYPE was already defined and imported as a type

The stacktrace doesn't give much information as to where the issue is occurring or to what the problem is. The project has 20+ models and dozens of resolvers so it's quite hard to debug.

Error: NEXUS__UNKNOWN__TYPE was already defined and imported as a type, check the docs for extending types
    at extendError (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1744:2)
    at SchemaBuilder.addType (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:603:8)
    at SchemaBuilder.missingType (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1212:5)
    at SchemaBuilder.getOrBuildType (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1540:4)
    at SchemaBuilder.getOutputType (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1471:10)
    at SchemaBuilder.buildOutputField (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1349:52)
    at /Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1307:7
    at Array.forEach (<anonymous>)
    at SchemaBuilder.buildOutputFields (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1306:7)
    at fields (/Users/username/Documents/folder/folder/graphq-nexus-prisma-api/node_modules/nexus/src/builder.ts:1009:33)

Any help appreciated.

node.jsexpressgraphqlapollonexus


Solution 1:[1]

It could have been much helpful if you could elaborate what did you do before this error happened.

I just came up with this error exactly as same as what you got and for me it was because I just accidentally changed the name for objectType of typeDef.

For instance, the name for the FollowUserResult was actually FollowResult and after I changed the name, the whole mutation resolvers related to this objectType became wrong.

export const FollowUserResult = objectType({
  name: "FollowUserResult", // It was originally "FollowResult"
  definition(t) {
    t.nonNull.boolean("ok");
    t.string("error");
  },
});

You may check on this again. Once you got those correct, delete the schema.graphql file and generate the new schema.graphql file.

Solution 2:[2]

I got the same error, but it was because I removed some exports. I'm not exactly sure what caused it, but I basically have a file that exports all of my graphql modules. E.g.

// graphql/modules/index.ts

export * from './file-a';
export * from './file-b';

When I removed the second export line, I started getting the error. I'm probably using some of the types defined in file-b somewhere else, and that's somehow causing the error. Anyway, adding the line back in fixed it (I had removed it by accident anyway).

Solution 3:[3]

I got this error because I was using the incorrect Node version. My project didn't have a .nvrmc file (yet) so I was using Node 10 on a project that uses Node 14. So after switching to the correct Node version this error went away

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Apensia
Solution 2 Cully
Solution 3 Guilherme Cabral

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