Update gatsby-node.js

.gitignore

@@ -1,3 +1,6 @@
 node_modules/
 .cache/
 public
+
+# ignore IDE
+.idea/

gatsby-node.js

@@ -0,0 +1,18 @@
+exports.sourceNodes = ({ actions, createNodeId, createContentDigest }) => {
+  const pokemons = [
+    { name: "Pikachu", type: "electric" },
+    { name: "Squirtle", type: "water" },
+  ]
+  pokemons.forEach(pokemon => {
+    const node = {
+      name: pokemon.name,
+      type: pokemon.type,
+      id: createNodeId(`Pokemon-${pokemon.name}`),
+      internal: {
+        type: "Pokemon",
+        contentDigest: createContentDigest(pokemon),
+      },
+    }
+    actions.createNode(node)
+  })
+}