feat(gatsby): allow schema customization

examples/using-type-definitions/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# dotenv environment variables file
+.env
+
+# gatsby files
+.cache/
+public
+
+# Mac files
+.DS_Store
+
+# Yarn
+yarn-error.log
+.pnp/
+.pnp.js
+# Yarn Integrity file
+.yarn-integrity

examples/using-type-definitions/.prettierrc

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+{
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "es5"
+}

examples/using-type-definitions/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 gatsbyjs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

examples/using-type-definitions/README.md

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+<!-- AUTO-GENERATED-CONTENT:START (STARTER) -->
+<p align="center">
+  <a href="https://www.gatsbyjs.org">
+    <img alt="Gatsby" src="https://www.gatsbyjs.org/monogram.svg" width="60" />
+  </a>
+</p>
+<h1 align="center">
+  Gatsby's default starter
+</h1>
+
+Kick off your project with this default boilerplate. This starter ships with the main Gatsby configuration files you might need to get up and running blazing fast with the blazing fast app generator for React.
+
+_Have another more specific idea? You may want to check out our vibrant collection of [official and community-created starters](https://www.gatsbyjs.org/docs/gatsby-starters/)._
+
+## 🚀 Quick start
+
+1.  **Create a Gatsby site.**
+
+    Use the Gatsby CLI to create a new site, specifying the default starter.
+
+    ```sh
+    # create a new Gatsby site using the default starter
+    npx gatsby new my-default-starter https://github.com/gatsbyjs/gatsby-starter-default
+    ```
+
+1.  **Start developing.**
+
+    Navigate into your new site’s directory and start it up.
+
+    ```sh
+    cd my-default-starter/
+    gatsby develop
+    ```
+
+1.  **Open the source code and start editing!**
+
+    Your site is now running at `http://localhost:8000`!
+
+    _Note: You'll also see a second link: _`http://localhost:8000/___graphql`_. This is a tool you can use to experiment with querying your data. Learn more about using this tool in the [Gatsby tutorial](https://www.gatsbyjs.org/tutorial/part-five/#introducing-graphiql)._
+
+    Open the `my-default-starter` directory in your code editor of choice and edit `src/pages/index.js`. Save your changes and the browser will update in real time!
+
+## 🧐 What's inside?
+
+A quick look at the top-level files and directories you'll see in a Gatsby project.
+
+    .
+    ├── node_modules
+    ├── src
+    ├── .gitignore
+    ├── .prettierrc
+    ├── gatsby-browser.js
+    ├── gatsby-config.js
+    ├── gatsby-node.js
+    ├── gatsby-ssr.js
+    ├── LICENSE
+    ├── package-lock.json
+    ├── package.json
+    └── README.md
+
+1.  **`/node_modules`**: This directory contains all of the modules of code that your project depends on (npm packages) are automatically installed.
+
+2.  **`/src`**: This directory will contain all of the code related to what you will see on the front-end of your site (what you see in the browser) such as your site header or a page template. `src` is a convention for “source code”.
+
+3.  **`.gitignore`**: This file tells git which files it should not track / not maintain a version history for.
+
+4.  **`.prettierrc`**: This is a configuration file for [Prettier](https://prettier.io/). Prettier is a tool to help keep the formatting of your code consistent.
+
+5.  **`gatsby-browser.js`**: This file is where Gatsby expects to find any usage of the [Gatsby browser APIs](https://www.gatsbyjs.org/docs/browser-apis/) (if any). These allow customization/extension of default Gatsby settings affecting the browser.
+
+6.  **`gatsby-config.js`**: This is the main configuration file for a Gatsby site. This is where you can specify information about your site (metadata) like the site title and description, which Gatsby plugins you’d like to include, etc. (Check out the [config docs](https://www.gatsbyjs.org/docs/gatsby-config/) for more detail).
+
+7.  **`gatsby-node.js`**: This file is where Gatsby expects to find any usage of the [Gatsby Node APIs](https://www.gatsbyjs.org/docs/node-apis/) (if any). These allow customization/extension of default Gatsby settings affecting pieces of the site build process.
+
+8.  **`gatsby-ssr.js`**: This file is where Gatsby expects to find any usage of the [Gatsby server-side rendering APIs](https://www.gatsbyjs.org/docs/ssr-apis/) (if any). These allow customization of default Gatsby settings affecting server-side rendering.
+
+9.  **`LICENSE`**: Gatsby is licensed under the MIT license.
+
+10. **`package-lock.json`** (See `package.json` below, first). This is an automatically generated file based on the exact versions of your npm dependencies that were installed for your project. **(You won’t change this file directly).**
+
+11. **`package.json`**: A manifest file for Node.js projects, which includes things like metadata (the project’s name, author, etc). This manifest is how npm knows which packages to install for your project.
+
+12. **`README.md`**: A text file containing useful reference information about your project.
+
+## 🎓 Learning Gatsby
+
+Looking for more guidance? Full documentation for Gatsby lives [on the website](https://www.gatsbyjs.org/). Here are some places to start:
+
+- **For most developers, we recommend starting with our [in-depth tutorial for creating a site with Gatsby](https://www.gatsbyjs.org/tutorial/).** It starts with zero assumptions about your level of ability and walks through every step of the process.
+
+- **To dive straight into code samples, head [to our documentation](https://www.gatsbyjs.org/docs/).** In particular, check out the _Guides_, _API Reference_, and _Advanced Tutorials_ sections in the sidebar.
+
+## 💫 Deploy
+
+[![Deploy to Netlify](https://www.netlify.com/img/deploy/button.svg)](https://app.netlify.com/start/deploy?repository=https://github.com/gatsbyjs/gatsby-starter-default)
+
+<!-- AUTO-GENERATED-CONTENT:END -->

examples/using-type-definitions/gatsby-config.js

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+module.exports = {
+  siteMetadata: {
+    title: `Gatsby Default Starter`,
+    description: `Kick off your next, great Gatsby project with this default starter. This barebones starter ships with the main Gatsby configuration files you might need.`,
+    author: `@gatsbyjs`,
+  },
+  plugins: [
+    {
+      resolve: `gatsby-source-filesystem`,
+      options: {
+        name: `images`,
+        path: `./src/images`,
+      },
+    },
+    `gatsby-transformer-sharp`,
+    `gatsby-plugin-sharp`,
+    `gatsby-transformer-json`,
+    {
+      resolve: `gatsby-source-filesystem`,
+      options: {
+        name: `data`,
+        path: `./src/data/`,
+      },
+    },
+    {
+      resolve: `gatsby-source-graphql`,
+      options: {
+        fieldName: `cms`,
+        url: `https://api-euwest.graphcms.com/v1/cjjr1at6d0xb801c3scjrm0l0/master`,
+        typeName: `GraphCMS`,
+        refetchInterval: 60,
+      },
+    },
+  ],
+}

examples/using-type-definitions/gatsby-node.js

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+exports.addTypeDefs = ({ addTypeDefs }) => {
+  const typeDefs = `
+    type AuthorJson implements Node {
+      name: String!
+      email: String!
+      picture: File @link(by: "relativePath")
+      posts: [BlogJson] @link(by: "authors.email", from: "email")
+    }
+
+    type BlogJson implements Node {
+      title: String!
+      authors: [AuthorJson] @link(by: "email")
+      text: String
+      date: Date @dateformat(formatString: "yyyy/MM/dd")
+      tags: [String]
+    }
+  `
+  addTypeDefs(typeDefs)
+}
+
+exports.addResolvers = ({
+  addResolvers,
+  actions,
+  cache,
+  store,
+  createNodeId,
+  // createContentDigest,
+  // reporter,
+  // getNode,
+  // getNodeAndSavePathDependency,
+  // pathPrefix,
+}) => {
+  const { createRemoteFileNode } = require(`gatsby-source-filesystem`)
+  const { createNode } = actions
+  const resolvers = {
+    GraphCMS_BlogPost: {
+      // Wrap the resolver on an existing field by providing a function.
+      // The original resolver is available on `info.resolver`.
+      // This approach works fine if the returnType stays the same.
+      post: async (source, args, context, info) => {
+        const remark = require(`remark`)
+        const html = require(`remark-html`)
+        const result = await info.resolver(source, args, context, info)
+        // return a Promise with the markdown string converted to html
+        return remark()
+          .use(html)
+          .process(result)
+      },
+    },
+    GraphCMS_Asset: {
+      // Instead of a resolve function it is possible to provide a
+      // field config for a *new* field.
+      // This allows specifying a return type. The values of sibling fields
+      // are available from `source` if they are in the selection set.
+      // Be aware that without other fields in the selection set this will
+      // throw if the parent is NonNull, even if this resolver returns a value.
+      // This is because the delegated schema does not know about this field.
+      imageFile: {
+        type: `File`,
+        // Projection fields will be included in the selection set without
+        // having to be explicitly added to the query, i.e.
+        // they will be accessible from `source`.
+        projection: { url: true, fileName: true },
+        resolve: async (source, args, context, info) => {
+          const { fileName, url } = source
+          const ext = `.` + fileName.match(/[^.]*$/)
+          const node = await createRemoteFileNode({
+            url,
+            store,
+            cache,
+            createNode,
+            createNodeId,
+            ext,
+            // name: fileName, // Needs #11054
+          })
+          return node
+        },
+      },
+    },
+  }
+  addResolvers(resolvers)
+}

examples/using-type-definitions/package.json

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+{
+  "name": "gatsby-starter-default",
+  "private": true,
+  "description": "A simple starter to get up and developing quickly with Gatsby",
+  "version": "0.1.0",
+  "author": "Kyle Mathews <mathews.kyle@gmail.com>",
+  "dependencies": {
+    "gatsby": "^2.0.55",
+    "gatsby-image": "^2.0.20",
+    "gatsby-plugin-sharp": "^2.0.14",
+    "gatsby-source-filesystem": "^2.0.13",
+    "gatsby-source-graphql": "^2.0.0",
+    "gatsby-transformer-json": "^2.1.7",
+    "gatsby-transformer-sharp": "^2.1.8",
+    "graphql": "0.13.2",
+    "prop-types": "^15.6.2",
+    "react": "^16.6.3",
+    "react-dom": "^16.6.3",
+    "react-helmet": "^5.2.0"
+  },
+  "keywords": [
+    "gatsby"
+  ],
+  "license": "MIT",
+  "scripts": {
+    "build": "gatsby build",
+    "develop": "gatsby develop",
+    "start": "npm run develop",
+    "format": "prettier --write \"src/**/*.js\"",
+    "test": "echo \"Write tests! -> https://gatsby.app/unit-testing\""
+  },
+  "devDependencies": {
+    "prettier": "^1.15.2"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/gatsbyjs/gatsby-starter-default"
+  },
+  "bugs": {
+    "url": "https://github.com/gatsbyjs/gatsby/issues"
+  }
+}