Build Error - Writing documentation with Docz

[alec-francis]

Hi, I just tried following the Docz tutorial from scratch located at:
https://www.gatsbyjs.org/docs/writing-documentation-with-docz/

I received a build error:

gatsby develop
warning Configuring yargs through package.json is deprecated and will be removed in the next major release, please use the JS API instead.
success open and validate gatsby-configs — 1.289 s
success load plugins — 0.695 s
warning Configuring yargs through package.json is deprecated and will be removed in the next major release, please use the JS API instead.
success onPreInit — 0.108 s
success initialize cache — 0.004 s
success copy gatsby files — 0.331 s
success onPreBootstrap — 0.006 s
warning Configuring yargs through package.json is deprecated and will be removed in the next major release, please use the JS API instead.
success source and transform nodes — 0.339 s
success building schema — 0.229 s
warning Configuring yargs through package.json is deprecated and will be removed in the next major release, please use the JS API instead.
success createPages — 0.158 s
success createPagesStatefully — 0.068 s
success onPreExtractQueries — 0.008 s
success update schema — 0.022 s
success extract queries from components — 0.109 s
success run static queries — 0.041 s — 5/5 125.64 queries/second
success run page queries — 0.033 s — 5/5 153.95 queries/second
success write out page data — 0.038 s
success write out redirect data — 0.010 s
success Build manifest and related icons — 0.107 s
success onPostBootstrap — 0.115 s

info bootstrap finished - 6.453 s

error (node:10692) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
error UNHANDLED REJECTION


  Error: You must provide the URL of lib/mappings.wasm by calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using SourceMapConsumer

  - read-wasm.js:8 readWasm
    [my-gatsby-site-with-docz]/[react-hot-loader]/[source-map]/lib/read-wasm.js:8:13

  - wasm.js:25 wasm
    [my-gatsby-site-with-docz]/[react-hot-loader]/[source-map]/lib/wasm.js:25:16

  - source-map-consumer.js:264 BasicSourceMapConsumer.then.that
    [my-gatsby-site-with-docz]/[react-hot-loader]/[source-map]/lib/source-map-consumer.js:264:14

Any idea what could be causing this issue?

Some of my environment details:

Windows 10 Pro Version 1803
gatsby --version
2.5.12
npm --version
6.4.1
node --version
v10.15.3

package.json

{
  "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": {
    "docz": "^1.0.4",
    "docz-theme-default": "^1.0.4",
    "gatsby": "^2.3.31",
    "gatsby-image": "^2.0.40",
    "gatsby-plugin-manifest": "^2.0.29",
    "gatsby-plugin-offline": "^2.0.25",
    "gatsby-plugin-react-helmet": "^3.0.12",
    "gatsby-plugin-sharp": "^2.0.35",
    "gatsby-source-filesystem": "^2.0.32",
    "gatsby-theme-docz": "^1.0.4",
    "gatsby-transformer-sharp": "^2.1.18",
    "prop-types": "^15.7.2",
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "react-helmet": "^5.2.0"
  },
  "devDependencies": {
    "prettier": "^1.17.0"
  },
  "keywords": [
    "gatsby"
  ],
  "license": "MIT",
  "scripts": {
    "build": "gatsby build",
    "develop": "gatsby develop",
    "format": "prettier --write src/**/*.{js,jsx}",
    "start": "npm run develop",
    "serve": "gatsby serve",
    "test": "echo \"Write tests! -> https://gatsby.dev/unit-testing\""
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/gatsbyjs/gatsby-starter-default"
  },
  "bugs": {
    "url": "https://github.com/gatsbyjs/gatsby/issues"
  }
}

gatsby-config.js

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`,
  },
  __experimentalThemes: [`gatsby-theme-docz`],
  plugins: [
    `gatsby-plugin-react-helmet`,
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `images`,
        path: `${__dirname}/src/images`,
      },
    },
    `gatsby-transformer-sharp`,
    `gatsby-plugin-sharp`,
    {
      resolve: `gatsby-plugin-manifest`,
      options: {
        name: `gatsby-starter-default`,
        short_name: `starter`,
        start_url: `/`,
        background_color: `#663399`,
        theme_color: `#663399`,
        display: `minimal-ui`,
        icon: `src/images/gatsby-icon.png`, // This path is relative to the root of the site.
      },
    },
    // this (optional) plugin enables Progressive Web App + Offline functionality
    // To learn more, visit: https://gatsby.dev/offline
    // `gatsby-plugin-offline`,
  ],
}

Feel free to let me know if you would like any further information.

Thanks

(I'll tag @LekoArts who wrote the tutorial)

[alec-francis]

Update: It looks like the issue is related to Gatsby 2.3.31. I downgraded to version 2.3.30 and the project compiled successfully.

Here is the link to another issue where this is being discussed:
#13641

Best Regards

[alec-francis]

I'll close this as the PR which caused this issue has been rolled back.