[gatsby-source-wordpress] add option for custom normalizer (gatsbyjs#…

…3450)

packages/gatsby-source-wordpress/README.md

@@ -97,6 +97,10 @@ plugins: [
  // Example: `["/*/*/comments", "/yoast/**"]` will exclude routes ending in `comments` and
  // all routes that begin with `yoast` from fetch.
  excludedRoutes: ["/*/*/comments", "/yoast/**"],
+ // use a custom normalizer which is applied after the built-in ones.
+ normalizer: function({ entities }) {
+ return entities;
+ },
  },
  },
 ];

packages/gatsby-source-wordpress/src/gatsby-node.js

@@ -18,6 +18,7 @@ let _auth
 let _perPage
 let _concurrentRequests
 let _excludedRoutes
+let _normalizer
 
 exports.sourceNodes = async (
  { boundActionCreators, getNode, store, cache, createNodeId },
@@ -32,6 +33,7 @@ exports.sourceNodes = async (
  searchAndReplaceContentUrls = {},
  concurrentRequests = 10,
  excludedRoutes = [],
+ normalizer,
  }
 ) => {
  const { createNode, touchNode } = boundActionCreators
@@ -43,6 +45,7 @@ exports.sourceNodes = async (
  _perPage = perPage
  _concurrentRequests = concurrentRequests
  _excludedRoutes = excludedRoutes
+ _normalizer = normalizer
 
  let entities = await fetch({
  baseUrl,
@@ -112,6 +115,32 @@ exports.sourceNodes = async (
  searchAndReplaceContentUrls,
  })
 
+ // apply custom normalizer
+ if (typeof _normalizer === `function`) {
+ entities = _normalizer({
+ entities,
+ store,
+ cache,
+ createNode,
+ createNodeId,
+ touchNode,
+ getNode,
+ typePrefix,
+ refactoredEntityTypes,
+ baseUrl,
+ protocol,
+ _siteURL,
+ hostingWPCOM,
+ useACF,
+ auth,
+ verboseOutput,
+ perPage,
+ searchAndReplaceContentUrls,
+ concurrentRequests,
+ excludedRoutes,
+ })
+ }
+
  // creates nodes for each entry
  normalize.createNodesFromEntities({ entities, createNode })