gatsby-node.js

gatsby-node.js

const path = require('path');
const { createFilePath } = require(`gatsby-source-filesystem`);

exports.onCreateNode = ({ node, getNode, actions }) => {
    const { createNodeField } = actions;
    if (node.internal.type === `MarkdownRemark`) {
        const slug = createFilePath({
            node,
            getNode,
            basePath: `posts` })
        createNodeField({
            node,
            name: `slug`,
            value: slug,
        })
    }
}

exports.createPages = ({ graphql, actions }) => {
    const { createPage } = actions;
    return graphql(`
    {
      allMarkdownRemark {
        edges {
          node {
            fields {
              slug
            }
            frontmatter {
              title
              type
            }
          }
        }
      }
    }
  `
    ).then(result => {
        result.data.allMarkdownRemark.edges.forEach(({ node }) => {
            createPage({
                path: node.fields.slug,
                component: path.resolve('./src/components/postLayout.js'),
                context: {
                    // Data passed to context is available
                    // in page queries as GraphQL variables.
                    slug: node.fields.slug,
                },
            })
        })
    })
}