Jest import looses doc.loc.source due to JSON.stringify

[emmanuelbuah]

Per issue laid out in apollographql/graphql-tag#115, stringifying gql DocumentNode loose doc.loc.source property since its not enumerable anymore.

Looking at the code, jest import utilizes stringification which makes it so the returned DocuemntNote encounters errors such as apollographql/graphql-tag#64 when used with graphql-tag.

I'd recommend patching the jest code to apply the same/similar fix in apollographql/graphql-tag#65 to address the issue.

[HriBB]

I'm getting a similar error with graphql-import-node and jest:

Unable to create News schema!
Cannot read property 'prev' of undefined
TypeError: Cannot read property 'prev' of undefined

      at getLeadingCommentBlock (../../node_modules/graphql/utilities/extendSchema.js:713:30)
      at getDescription (../../node_modules/graphql/utilities/extendSchema.js:694:20)
      at buildType (../../node_modules/graphql/utilities/extendSchema.js:546:23)
      at extendSchemaImpl (../../node_modules/graphql/utilities/extendSchema.js:138:120)
      at Object.buildASTSchema (../../node_modules/graphql/utilities/buildASTSchema.js:56:51)
      at buildSchemaFromTypeDefinitions (../../dist/schema/src/buildSchemaFromTypeDefinitions.js:9:18)
      at Object.makeExecutableSchema (../../dist/schema/src/makeExecutableSchema.js:64:18)
      at Object.<anonymous>.exports.createSchema (src/news/createSchema.ts:55:20)
      at Object.<anonymous> (test/app.test.ts:13:22)
      at Object.<anonymous>.exports.createSchema (src/news/createSchema.ts:61:11)
      at Object.<anonymous> (test/app.test.ts:13:22)

Error appears only in tests. If I use gql it works.