node.js - Heroku: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory even after changing NODE OPTIONS

I am deploying a Shopify App to Heroku and the build fails with:Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory.

I already tried setting NODE options like this:

heroku config:set NODE_OPTIONS="--max_old_space_size=2560" -a [app_name]
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This did not work either, even after taking memory as high as 8192. I am running a 2x dyno with 1GB memory. Here is an excerpt from my package.json:

  "scripts": {
    "shopify": "shopify",
    "build": "shopify app build",
    "dev": "shopify app dev",
    "info": "shopify app info",
    "generate": "shopify app generate",
    "start": "NODE_ENV=production node ./web/index.js",
    "deploy": "shopify app deploy"
  },
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I suspected increasing the max_old_space or changing to a paid dyno would help, but no luck.

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