gatsby-transformer-sharp/create-resolvers.js

"use strict";

const {
  supportedExtensions
} = require(`./supported-extensions`);

module.exports = ({
  createResolvers,
  reporter
}, pluginOptions = {}) => {
  const {
    checkSupportedExtensions = true
  } = pluginOptions;
  const resolvers = {
    File: {
      childImageSharp: {
        resolve: (parent, args, context, info) => {
          // TODO: In future when components from GraphQL are possible make sure that we can support both supported & unsupported image formats
          if (!supportedExtensions[parent.extension] && checkSupportedExtensions) {
            reporter.warn(`You can't use childImageSharp together with ${parent.name}.${parent.extension} — use publicURL instead. The childImageSharp portion of the query in this file will return null:\n${context.componentPath}`);
          }

          return info.originalResolver(parent, args, context, info);
        }
      }
    }
  };
  createResolvers(resolvers);
};