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Clarify Wrangler esbuild update policy #20792

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merged 3 commits into from
Mar 13, 2025
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Clarify Wrangler esbuild update policy #20792

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Update bundling.mdx
penalosa Mar 13, 2025
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Update src/content/docs/workers/wrangler/bundling.mdx
penalosa Mar 13, 2025
f2b70e9
Update update-v3-to-v4.mdx
penalosa Mar 13, 2025
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7 changes: 7 additions & 0 deletions src/content/docs/workers/wrangler/bundling.mdx
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Expand Up @@ -7,6 +7,13 @@ description: Review Wrangler's default bundling.

By default, Wrangler bundles your Worker code using [`esbuild`](https://esbuild.github.io/). This means that Wrangler has built-in support for importing modules from [npm](https://www.npmjs.com/) defined in your `package.json`. To review the exact code that Wrangler will upload to Cloudflare, run `npx wrangler deploy --dry-run --outdir dist`, which will show your Worker code after Wrangler's bundling.

<details>
<summary>`esbuild` version</summary>

Wrangler uses `esbuild` v0.24. We periodically update the `esbuild` version included with Wrangler, and since `esbuild` is a pre-1.0.0 tool, this may sometimes include breaking changes to how bundling works. In particular, we may bump the `esbuild` version in a Wrangler minor version.

</details>

:::note

Wrangler's inbuilt bundling usually provides the best experience, but we understand there are cases where you will need more flexibility.
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