gatsby-node.js

require('dotenv').config()
const pruneCache = require('./src/gatsby/prune-cache')

const {
  setPageContext,
  removePageTrailingSlash
} = require('./src/gatsby/common')

const models = require('./src/gatsby/models.js')
const callOnModels = require('./src/gatsby/utils/models')

exports.createSchemaCustomization = api =>
  callOnModels(models, 'createSchemaCustomization', api)
exports.onCreateNode = api => callOnModels(models, 'onCreateNode', api)
exports.createPages = api => callOnModels(models, 'createPages', api)

exports.onCreatePage = ({ page, actions }) => {
  setPageContext(page, actions)
  removePageTrailingSlash(page, actions)
}

// Ignore warnings about CSS inclusion order, because we use CSS modules.
// https://spectrum.chat/gatsby-js/general/having-issue-related-to-chunk-commons-mini-css-extract-plugin~0ee9c456-a37e-472a-a1a0-cc36f8ae6033?m=MTU3MjYyNDQ5OTAyNQ==
exports.onCreateWebpackConfig = ({ stage, actions, getConfig }) => {
  if (stage === 'build-javascript') {
    const config = getConfig()

    // Add polyfills
    config.entry.app = [
      'promise-polyfill/src/polyfill',
      'isomorphic-fetch',
      'raf-polyfill',
      config.entry.app
    ]

    const miniCssExtractPlugin = config.plugins.find(
      plugin => plugin.constructor.name === 'MiniCssExtractPlugin'
    )
    if (miniCssExtractPlugin) {
      miniCssExtractPlugin.options.ignoreOrder = true
    }
    actions.replaceWebpackConfig(config)
  }
}

exports.onPostBuild = api => {
  return Promise.all([callOnModels(models, 'onPostBuild', api), pruneCache])
}