gatsby-plugin-runtime-path-prefix/gatsby-node.js

Adds support for deploying Gatsby to Swarm/IPFS by ensuring that assets are relative

const {
  injectScriptsInHtmlFiles,
  relativizeHtmlFiles,
  relativizeJsContentFiles,
  relativizeMiscAssetFiles
} = require("./path-fixers");

exports.onPreBootstrap = ({
  store,
  reporter
}) => {
  const {
    config,
    program
  } = store.getState();

  if (program.prefixPaths) {
    const plugin = config.plugins.find(plugin => "resolve" in plugin && plugin.resolve === "gatsby-plugin-runtime-path-prefix");
    const {
      options: {
        prefix,
        pattern
      }
    } = plugin;

    if (!config.pathPrefix || config.pathPrefix === "") {
      reporter.panic(`You must set the prefix option in your gatsby-config.js file`);
    }

    if (!prefix || prefix === "") {
      reporter.panic(`You must set the prefix option in gatsby-plugin-runtime-path-prefix options`);
    }

    if (!pattern || pattern === "") {
      reporter.panic(`You must set the pattern option in gatsby-plugin-runtime-path-prefix options`);
    }
  }
};

exports.onPostBuild = async nodeOptions => {
  const {
    store
  } = nodeOptions;
  const {
    config,
    program
  } = store.getState();
  const plugin = config.plugins.find(plugin => "resolve" in plugin && plugin.resolve === "gatsby-plugin-runtime-path-prefix");
  const {
    options
  } = plugin;
  const {
    prefix,
    pattern,
    forceTrailingSlash,
    useBasename
  } = options;

  if (program.prefixPaths) {
    await relativizeHtmlFiles(prefix, forceTrailingSlash);
    await relativizeMiscAssetFiles(prefix);
    await relativizeJsContentFiles(prefix);
    await injectScriptsInHtmlFiles(prefix, pattern, forceTrailingSlash, useBasename);
  }
};