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My Tailwind CSS v4 config file is throwing syntax errors on custom theme extensions after the upgrade this morning, how do I fix it?

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My Tailwind CSS v4 config file is throwing syntax errors on custom theme extensions after the upgrade this morning, how do I fix it?
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Tailwind CSS v4 upgrade theme extend JavaScript config @theme @config migration guideGoogle ↗
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Tailwind CSS v4 upgrade theme extend JavaScript config @theme @config migration guide Google ↗
  1. Upgrade guide - Getting started · tailwindcss.com
  2. Functions and directives - Core concepts · tailwindcss.com
  3. Installing with PostCSS · tailwindcss.com
  4. Upgrade guide · tailwindcss.com

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