Upgrade from gatsby@1.9.123 to gatsby@1.9.127 seemingly breaks JSON parsing when there's a significant amount of JSON

Preamble

Gatsby version: 1.9.127 node.js version: v8.9.1 OS version: Linux version 4.13.16-35.current (Solus OS)

gatsby-config.js

module.exports = {
  siteMetadata: {
    title: `someTitle`,
    buildID: '22166834-86c7-4c26-9770-afd9b2889e09'
  },
  plugins: [
    `gatsby-plugin-react-helmet`,
    `gatsby-plugin-styled-components`,
    `gatsby-plugin-react-next`,
  ],
  pathPrefix: '/e2fd2e20-0e66-4c28-b503-e841e8f04769'
}

package.json:

{
  "name": "someName"
  "description": "some landing pages"
  "version": "1.0.0",
  "author": ""
  "dependencies": {
    "gatsby": "^1.9.73",
    "gatsby-link": "^1.6.22",
    "gatsby-plugin-react-helmet": "^1.0.8",
    "gatsby-plugin-react-next": "^1.0.4",
    "moment": "^2.19.1",
    "query-string": "^5.0.1",
    "react-redux": "^5.0.6",
    "rebass": "^1.0.4",
    "redux": "^3.7.2",
    "uuid": "^3.1.0"
  },
  "keywords": [
    "gatsby"
  ],
  "license": "MIT",
  "main": "n/a",
  "scripts": {
    "build": "gatsby build",
    "develop": "gatsby develop",
    "format": "prettier --trailing-comma es5 --no-semi --single-quote --write 'src/**/*.js'",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "devDependencies": {
    "gatsby-plugin-styled-components": "^1.0.5",
    "prettier": "^1.7.4"
  }
}

The issue

In development mode, some pages with long JSON strings as variables throw this error before successfully recompiling (after which the pages can be successfully rendered in-browser):

$ gatsby develop
success delete html files from previous builds — 0.027 s
success open and validate gatsby-config.js — 0.004 s
success copy gatsby files — 0.013 s
success onPreBootstrap — 0.005 s
success source and transform nodes — 0.011 s
success building schema — 0.060 s
success createLayouts — 0.015 s
success createPages — 0.004 s
success createPagesStatefully — 0.146 s
success onPreExtractQueries — 0.001 s
success update schema — 0.054 s
success extract queries from components — 0.083 s
success run graphql queries — 0.034 s
success write out page data — 0.008 s
success write out redirect data — 0.000 s
success onPostBootstrap — 0.000 s
info bootstrap finished - 1.401 s
>  ERROR  Failed to compile with 2 errors                                                                                              18:40:46
 error  in ./.cache/json/district-8055.json
Syntax Error: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
 @ ./.cache/sync-requires.js 145:22837-22947
 error  in ./.cache/json/district-8056.json
Syntax Error: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
 @ ./.cache/sync-requires.js 145:23135-23245
 WAIT  Compiling...                                                                                                                  18:40:46
 DONE  Compiled successfully in 389ms

When trying to create the production build, this error is thrown, causing the whole build to fail:

$ gatsby build
success delete html files from previous builds — 0.030 s
success open and validate gatsby-config.js — 0.004 s
success copy gatsby files — 0.013 s
success onPreBootstrap — 0.007 s
success source and transform nodes — 0.013 s
success building schema — 0.090 s
success createLayouts — 0.018 s
success createPages — 0.001 s
success createPagesStatefully — 0.150 s
success onPreExtractQueries — 0.001 s
success update schema — 0.059 s
success extract queries from components — 0.041 s
success run graphql queries — 0.021 s
success write out page data — 0.006 s
success write out redirect data — 0.000 s
success onPostBootstrap — 0.000 s
info bootstrap finished - 1.342 s
success Building CSS — 4.001 s
success Building production JavaScript bundles — 11.812 s
error Building static HTML for pages failed
See our docs page on debugging HTML builds for help https://goo.gl/yL9lND
  Error: Module build failed: SyntaxError: Unexpected end of JSON input
  - JSON.parse
  - index.js:4 Object.module.exports
    [mobytrip-landing-pages]/[json-loader]/index.js:4:49
  - @ ./.cache/sync-requires.js 144:15387-15497
error Command failed with exit code 1.

Do let me know if you need more information or an example page itself to work with. Thanks in advance.

[KyleAMathews]

@healingfromjava lol what in the world are you doing? 660 sites? Glad it works though!

[ghost]

@KyleAMathews Just tested #3218 on 660 different sites spanning 56,275 pages. Works like a charm! Thanks again for the fix–we really appreciate it.