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: `${urljoin(config.siteUrl, config.pathPrefix)}/logos/logo-48.png`,
    },
  },
  plugins: [
    'gatsby-plugin-sass',
    'gatsby-plugin-react-helmet',
    'gatsby-plugin-twitter',
    {
      resolve: `gatsby-plugin-netlify`,
      options: {
        headers: {
          '/*.js': ['cache-control: public, max-age=31536000, immutable'],
          '/*.css': ['cache-control: public, max-age=31536000, immutable'],
          '/sw.js': ['cache-control: public, max-age=0, must-revalidate'],
        },
      },
    },
    {
      // Default Configuration 
      resolve: 'gatsby-source-filesystem',
      options: {
        name: 'assets',
        path: `${__dirname}/static/`,
      },
    },
    {
      resolve: 'gatsby-plugin-typography',
      options: {
        pathToConfigModule: `${__dirname}/src/utils/typography.js`,
      },
    },
    {
      // Post load images and markdown
      resolve: 'gatsby-source-filesystem',
      options: {
        name: 'posts',
        path: `${__dirname}/content/`,
      },
    },
    {
      // All other data images (speaking) 
      // order of files matter if one plugin later relies on previous
      // e.g. manifest file first (top) and service workers last (bottom)
      resolve: 'gatsby-source-filesystem',
      options: {
        name: 'speaking',
        path: `${__dirname}/data/`,
      },
    },
    {
      // This will look across all gatsby-source-filesystems declarations
      resolve: 'gatsby-transformer-json',
    },
    {
      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: '/logos/logo-48.png',
            sizes: '48x48',
            type: 'image/png',
          },
          {
            src: '/logos/logo-1024.png',
            sizes: '1024x1024',
            type: 'image/png',
          },
        ],
      },
    },
    {
      resolve: 'gatsby-plugin-feed',
      options: {
        setup(ref) {
          const ret = ref.query.site.siteMetadata.rssMetadata
          ret.allMarkdownRemark = ref.query.allMarkdownRemark
          ret.generator = 'Vincent Tang'
          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,
          },
        ],
      },
    },
  ],
}