与类型定义相同的架构文档中的类型扩展是否有效？

Question

我很难找到清楚这一点的文档:我可以在我定义类型的同一个模式文档中扩展一个类型吗？我经常会犯以下错误：

Error: Cannot extend type "Healthcheck" because it is not defined.
    at assertValidSDL (/Users/rhys.evans/Projects/or/biz-ops-api/node_modules/graphql/validation/validate.js:80:11)
    at Object.buildASTSchema (/Users/rhys.evans/Projects/or/biz-ops-api/node_modules/graphql/utilities/buildASTSchema.js:69:34)
    at Object.buildSchemaFromTypeDefinitions (/Users/rhys.evans/Projects/or/biz-ops-api/node_modules/graphql-tools/dist/generate/buildSchemaFromTypeDefinitions.js:23:28)
    at makeExecutableSchema (/Users/rhys.evans/Projects/or/biz-ops-api/node_modules/graphql-tools/dist/makeExecutableSchema.js:26:29)
    at makeAugmentedExecutableSchema (/Users/rhys.evans/Projects/or/biz-ops-api/node_modules/neo4j-graphql-js/dist/augment.js:75:49)
    at makeAugmentedSchema (/Users/rhys.evans/Projects/or/biz-ops-api/node_modules/neo4j-graphql-js/dist/index.js:232:53)
    at createSchema (/Users/rhys.evans/Projects/or/biz-ops-api/server/data/graphql-schema.js:36:17)
    at EventEmitter.constructAPI (/Users/rhys.evans/Projects/or/biz-ops-api/server/routes/graphql.js:19:21)
    at emitOne (events.js:121:20)
    at EventEmitter.emit (events.js:211:7)

模式文档：

directive @deprecated(
  reason: String = "No longer supported"
) on FIELD_DEFINITION | ENUM_VALUE | ARGUMENT_DEFINITION

type Healthcheck {
  code: String
}

type Check {
  name: String
}

extend type Healthcheck {
  checks: [Check]
}

我想这是不允许的，但是有人能告诉我规范/其他文档在哪里说得很清楚吗？

Answer 1

通常，类型扩展只在与类型定义相同的文档中工作。在使用多个文档或类型定义生成架构之前，大多数接受多个文档或类型定义的库将它们合并到一个文档中。

从规范的角度看，您的类型定义没有什么问题。您所看到的是一个bug，它是特定于新4j-graphql-js。