gatsby build error: JSON.parse (from json-loader)

[alampros]

Occurs when a large number of pages (~20-50) are generated via gatsby-node.js#createPage. Works fine when only a handful are generated using the same method.

I've created a repo to reproduce this error: https://github.com/alampros/gatsby-json-parse-bug

error Building static HTML for pages failed

  Error: WebpackError

  - JSON.parse

  - index.js:4 Object.module.exports
    [gatsby-json-parse-bug]/[json-loader]/index.js:4:49

  - From previous event:

  - build-html.js:48 _callee$
    [gatsby-json-parse-bug]/[gatsby]/dist/commands/build-html.js:48:46

  - next_tick.js:131 _combinedTickCallback
    internal/process/next_tick.js:131:7

  - next_tick.js:180 process._tickCallback
    internal/process/next_tick.js:180:9

[attfarhan]

This sounds like this could be the issue I'm seeing in #3139.

[alampros]

I'm stumped. The closest I've gotten to narrowing this down is to insert a sleep function into develop-html.js at L21, but even a 200ms sleep still throws the error 50% of the time. 1000ms seems to work for my test scenario, but that's probably because I only have 100 pages.

My gut tells me its something to do with a debounced function or an async fs.writeFile call with a missed await somewhere, but I can't find anything.

(╯°□°)╯︵ ┻━┻

[KyleAMathews]

Should be fixed in #3218 lemme know if you're still seeing troubles!

[KyleAMathews]

@alampros thanks so much for your reproduction site! It was perfect for debugging what was going on ❤️