gatsby-node.js for Contentful richTextAST GraphQL node

gatsby-node-richTextAST.js

const { GraphQLJSON } = require('gatsby/graphql');

/*
 I don't think we need to pathPrefixCacheStr this.
 I would expect path prefixing to happen at the sourceNodes call and we are
 parsing it's internal content which would have the prefixed changes.
 New changes should change the digest in the sourceNodes call.
 */
const richTextASTCacheKey = node =>
  `source-contentful-rich-text-AST-${node.internal.contentDigest}`;

exports.setFieldsOnGraphQLNodeType = ({ type, cache }) => {
  const getRichTextAST = async richTextNode => {
    const cachedRichTextAST = await cache.get(
      richTextASTCacheKey(richTextNode)
    );

    if (cachedRichTextAST) {
      return cachedRichTextAST;
    }

    const richTextAST = JSON.parse(richTextNode.internal.content);
    /*
     For some horrible reason, Gatsby uses a package for caching that says it resolves with the set value, but it
     actually does not...
     So we await the value to make sure something stores, and dangerously assume it is our content...
     Then we return the content we sent...
     */
    await cache.set(richTextASTCacheKey(richTextNode), richTextAST);
    return richTextAST;
  };

  if (type.name.match(/contentful.*RichTextNode/)) {
    return {
      richTextAST: {
        type: GraphQLJSON,
        resolve: richTextNode => {
          return getRichTextAST(richTextNode);
        }
      }
    };
  }
  return {};
};