当我将现有的GrpahqlSchema传递给buildFederatedSchema时，我得到的错误以下
Cannot read property 'kind' of undefined
这是因为当我将GrpahqlSchema传递给buildFederatedSchema时，它的验证失败。
at Object.validateSDL (/Users/alti/Projects/woundtech/woundtech-fhir-graphql/node_modules/graphql/validation/validate.js:62:24)
at Object.buildSchemaFromSDL (/Users/alti/Projects/woundtech/woundtech-fhir-graphql/node_modules/apollo-graphql/lib/schema/buildSchemaFromSDL.js:36:31)
at buildFederatedSchema (/Users/alti/Projects/woundtech/woundtech-fhir-graphql/node_modules/@apollo/federation/dist/service/buildFederatedSchema.js:32:35)
https://github.com/apollographql/apollo-server/pull/3013上有一个开放的PR。还有其他选择吗？