fix: add explicit schema for hidden challenges

client/gatsby-node.js

@@ -210,3 +210,41 @@ exports.onCreateBabelConfig = ({ actions }) => {
     }
   });
 };
+
+// Typically the schema can be inferred, but not when some challenges are
+// skipped (at time of writing the Chinese only has responsive web design), so
+// this makes the missing fields explicit.
+exports.createSchemaCustomization = ({ actions }) => {
+  const { createTypes } = actions;
+  const typeDefs = `
+    type ChallengeNode implements Node {
+      question: Question
+      videoId: String
+      required: ExternalFile
+      files: ChallengeFile
+    }
+    type Question {
+      text: String
+      answers: [String]
+      solution: Int
+    }
+    type ChallengeFile {
+      indexhtml: FileContents
+      indexjs: FileContents
+      indexjsx: FileContents
+    }
+    type ExternalFile {
+      link: String
+      src: String
+    }
+    type FileContents {
+      key: String
+      ext: String
+      name: String
+      contents: String
+      head: String
+      tail: String
+    }
+  `;
+  createTypes(typeDefs);
+};