chore: import upstream snapshot with attribution

tools/client-plugins/gatsby-source-challenges/create-challenge-nodes.js

@@ -0,0 +1,61 @@
+const crypto = require('crypto');
+
+const createdIds = new Set();
+
+function createChallengeNode(
+  challenge,
+  reporter,
+  { isReloading } = { isReloading: false }
+) {
+  const contentDigest = crypto
+    .createHash('md5')
+    .update(JSON.stringify(challenge))
+    .digest('hex');
+  const internal = {
+    contentDigest,
+    type: challenge.challengeType === 7 ? 'CertificateNode' : 'ChallengeNode'
+  };
+
+  if (internal.type === 'ChallengeNode') {
+    const { block, dashedName, superBlock } = challenge;
+    const slug = `/learn/${superBlock}/${block}/${dashedName}`;
+    const blockHashSlug = `/learn/${superBlock}/#${block}`;
+
+    challenge.fields = {
+      slug,
+      blockHashSlug
+    };
+  }
+
+  // Challenge id should be unique for CertificateNodes, but not for
+  // ChallengeNodes
+  const id =
+    internal.type === 'ChallengeNode' ? challenge.fields.slug : challenge.id;
+
+  if (createdIds.has(id) && !isReloading) {
+    throw Error(`
+    Challenge slugs must be unique, but ${id} already exists.
+    `);
+  }
+  createdIds.add(id);
+
+  return JSON.parse(
+    JSON.stringify(
+      Object.assign(
+        {},
+        {
+          children: [],
+          parent: null,
+          internal,
+          sourceInstanceName: 'challenge'
+        },
+        { challenge },
+        {
+          id
+        }
+      )
+    )
+  );
+}
+
+exports.createChallengeNode = createChallengeNode;