gatsby-config.js

const urljoin = require('url-join')
const config = require('./data/SiteConfig')

module.exports = {
  pathPrefix: config.pathPrefix === "" ? "/" : config.pathPrefix,
  siteMetadata: {
    siteUrl: urljoin(config.siteUrl, config.pathPrefix),
    rssMetadata: {
      site_url: urljoin(config.siteUrl, config.pathPrefix),
      feed_url: urljoin(config.siteUrl, config.pathPrefix, config.siteRss),
      title: config.siteTitle,
      description: config.siteDescription,
      image_url: `${urljoin(
        config.siteUrl,
        config.pathPrefix
      )}/logos/logo-48.png`
    }
  },
  plugins: [
    "gatsby-plugin-sass",
    "gatsby-plugin-react-helmet",
    {
      resolve: `gatsby-plugin-netlify`,
      options: {
        headers: {
          "/*.js": ["cache-control: public, max-age=31536000, immutable"],
          "/*.css": ["cache-control: public, max-age=31536000, immutable"],
          "/sw.js": ["cache-control: public, max-age=0, must-revalidate"]
        }
      }
    },
    {
      resolve: "gatsby-source-filesystem",
      options: {
        name: "assets",
        path: `${__dirname}/static/`
      }
    },
    {
      resolve: "gatsby-plugin-typography",
      options: {
        pathToConfigModule: `${__dirname}/src/utils/typography.js`
      }
    },
    {
      resolve: "gatsby-source-filesystem",
      options: {
        name: "posts",
        path: `${__dirname}/content/`
      }
    },
    {
      resolve: "gatsby-transformer-remark",
      options: {
        plugins: [
          {
            resolve: "gatsby-remark-images",
            options: {
              maxWidth: 850
            }
          },
          "gatsby-remark-prismjs",
          "gatsby-remark-copy-linked-files",
          {
            resolve: `gatsby-remark-autolink-headers`,
            options: {
              offsetY: `100`,
              maintainCase: false,
              removeAccents: true
            }
          }
        ]
      }
    },
    {
      resolve: "gatsby-plugin-google-analytics",
      options: {
        trackingId: config.googleAnalyticsID
      }
    },
    {
      resolve: "gatsby-plugin-nprogress",
      options: {
        color: config.themeColor
      }
    },
    "gatsby-plugin-sharp",
    `gatsby-transformer-sharp`,
    "gatsby-plugin-catch-links",
    "gatsby-plugin-sitemap",
    {
      resolve: "gatsby-plugin-manifest",
      options: {
        name: config.siteTitle,
        short_name: config.siteTitleShort,
        description: config.siteDescription,
        start_url: config.pathPrefix,
        background_color: config.backgroundColor,
        theme_color: config.themeColor,
        display: "minimal-ui",
        icons: [
          {
            src: "/favicons/android-chrome-192x192.png",
            sizes: "192x192",
            type: "image/png"
          },
          {
            src: "/favicons/android-chrome-512x512.png",
            sizes: "512x512",
            type: "image/png"
          }
        ]
      }
    },
    {
      resolve: "gatsby-plugin-feed",
      options: {
        setup(ref) {
          const ret = ref.query.site.siteMetadata.rssMetadata;
          ret.allMarkdownRemark = ref.query.allMarkdownRemark;
          ret.generator = "Duncan Leung";
          return ret;
        },
        query: `
        {
          site {
            siteMetadata {
              rssMetadata {
                site_url
                feed_url
                title
                description
                image_url
              }
            }
          }
        }
      `,
        feeds: [
          {
            serialize(ctx) {
              const { rssMetadata } = ctx.query.site.siteMetadata;
              return ctx.query.allMarkdownRemark.edges.map(edge => ({
                categories: edge.node.frontmatter.tags,
                date: edge.node.fields.date,
                title: edge.node.frontmatter.title,
                description: edge.node.excerpt,
                url: rssMetadata.site_url + edge.node.fields.slug,
                guid: rssMetadata.site_url + edge.node.fields.slug,
                custom_elements: [
                  { "content:encoded": edge.node.html },
                  { author: config.userEmail }
                ]
              }));
            },
            query: `
            {
              allMarkdownRemark(
                limit: 1000,
                sort: { order: DESC, fields: [fields___date] },
                filter: { frontmatter: { template: { eq: "post" } } }
              ) {
                edges {
                  node {
                    excerpt(pruneLength: 180)
                    html
                    timeToRead
                    fields {
                      slug
                      date
                    }
                    frontmatter {
                      title
                      date
                      categories
                      tags
                      template
                    }
                  }
                }
              }
            }
          `,
            output: config.siteRss,
            title: "Duncan Leung - RSS Feed"
          }
        ]
      }
    }
  ]
};