chore: upgrade to Gatsby 5

gatsby-node.mjs

@@ -0,0 +1,101 @@
+import path from "path";
+import slugify from "@sindresorhus/slugify";
+
+/**
+ * @typedef {import('gatsby').GatsbyNode} GatsbyNode
+ */
+
+/** @type GatsbyNode["onCreateNode"] */
+export const onCreateNode = ({ node, actions }) => {
+  const { createNodeField } = actions;
+  if (node.internal.type === "Mdx") {
+    createNodeField({
+      node,
+      name: "slug",
+      value: slugify(node.frontmatter.title),
+    });
+  }
+};
+
+/** @type GatsbyNode["createPages"] */
+export const createPages = async ({
+  graphql,
+  actions,
+  /* createNodeId,
+  createContentDigest, */
+}) => {
+  const { createPage, createRedirect } = actions;
+
+  const results = await graphql(`
+    query {
+      allMdx {
+        edges {
+          node {
+            id
+            fields {
+              slug
+              source
+            }
+            internal {
+              contentFilePath
+            }
+          }
+        }
+      }
+    }
+  `);
+
+  /** @type any[] */
+  const allEdges = results.data.allMdx.edges;
+
+  const blogEdges = allEdges.filter(
+    (edge) => edge.node.fields.source === "posts"
+  );
+  const pageEdges = allEdges.filter(
+    (edge) => edge.node.fields.source === "pages"
+  );
+
+  blogEdges.forEach((edge, index) => {
+    const previous =
+      index === blogEdges.length - 1 ? null : blogEdges[index + 1].node;
+    const next = index === 0 ? null : blogEdges[index - 1].node;
+
+    createPage({
+      path: `/blog/${edge.node.fields.slug}`,
+      component: `${path.resolve("./src/layouts/Post.tsx")}?__contentFilePath=${
+        edge.node.internal.contentFilePath
+      }`,
+      context: {
+        id: edge.node.id,
+        slug: edge.node.fields.slug,
+        previous,
+        next,
+      },
+    });
+  });
+
+  pageEdges.forEach((edge, index) => {
+    createPage({
+      path: `/${edge.node.fields.slug}`,
+      component: path.resolve("./src/layouts/Page.tsx"),
+      context: {
+        id: edge.node.id,
+        slug: edge.node.slug,
+      },
+    });
+  });
+
+  // redirects due to changed slugs
+  createRedirect({
+    fromPath: "/blog/nixos-restic-backups",
+    toPath: "/blog/optimised-backups-on-nix-os-with-restic-and-fd/",
+    isPermanent: true,
+    redirectInBrowser: true,
+  });
+  createRedirect({
+    fromPath: "/blog/nixos-restic-backups/",
+    toPath: "/blog/optimised-backups-on-nix-os-with-restic-and-fd/",
+    isPermanent: true,
+    redirectInBrowser: true,
+  });
+};