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We recently introduced some better instrumentation (https://github.com/tailwindlabs/tailwindcss/pull/15303) which uses the new `using` keyword. I made sure that this was compiled correctly for environments where `using` is not available yet. The issue is that this also relies on `Symbol.dispose` being available. In my testing on our minimal required Node.js version (18) it did work fine. However, turns out that I was using `18.20.x` locally where `Symbol.dispose` **_is_** available, but on older version of Node.js 18 (e.g.: `18.17.x`) it is **_not_** available. This now results in some completely broken builds, e.g.: when running on Cloudflare Pages. See: #15399 I could reproduce this error in CI, by temporarily downgrading the used Node.js version to `18.17.0`. See: <img width="1142" alt="image" src="https://github.com/user-attachments/assets/5bf30f80-9ca0-40d9-ad02-d1ffb4e0e5dd" /> Implementing the proper polyfill, as recommended by the TypeScript docs ( see: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-2.html#:~:text=Symbol.dispose,-??=%20Symbol(%22Symbol.dispose ), the error goes away. (If you look at CI after the polyfill, it still fails but for different reasons unrelated to this change) Fixes: #15399 --- ## Test plan 1. I reproduced it in CI, and I kept the commits so that you can take a look where it fails with the `Object not disposable`. 2. Using the provided reproduction from #15399: ### Before It works on Node.js v18.20.x, but switching to Node.js v18.17.x you can see it fail: <img width="1607" alt="image" src="https://github.com/user-attachments/assets/cb6ab73a-8eb2-4003-bab7-b2390f1c879d" /> ### After Using pnpm's overrides, we can apply the fix from this PR and test it in the reproduction. You'll notice that it now works in both Node.js v18.20.x and v18.17.x <img width="1604" alt="image" src="https://github.com/user-attachments/assets/b3a65557-0658-4cb0-a2f9-e3079c7936d5" />