Add type generation support to `wrangler dev`

[NuroDev]

Fixes https://jira.cfdata.org/browse/DEVX-2342

wrangler dev --types

{
	"$schema": "node_modules/wrangler/config-schema.json",
	"name": "example",
	"main": "src/index.ts",
	"compatibility_date": "2025-12-12",
	"dev": {
		"generate_types": true
	}
}

---

• Tests
  • [x] Tests included/updated
  • [ ] Tests not necessary because:
• Public documentation
  • [x] Cloudflare docs PR(s): https://github.com/cloudflare/cloudflare-docs/pull/27088
  • [ ] Documentation not necessary because:
• Wrangler V3 Backport
  • [ ] Wrangler PR:
  • [x] Not necessary because: Not a patch change(?)

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 8a2c8fbdb8e057a7be6139afc91e0e84ff550cc6

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[claude[bot]]

Claude finished @NuroDev's task in 50s —— View job

---

Changeset Review

• [x] Read changeset guidelines
• [x] Read changeset file
• [x] Validate version types
• [x] Check changelog quality
• [x] Check for markdown header issues
• [x] Provide final verdict

---

✅ Changeset looks good!

The changeset file .changeset/plain-beds-spend.md follows all the required guidelines:

Version Types ✅

• @cloudflare/workers-utils: minor ✓
• wrangler: minor ✓

Both packages correctly use minor version bumps for this new feature (no forbidden major versions).

Changelog Quality ✅

• Clear title: "Add type generation support to wrangler dev" - imperative, descriptive
• Usage examples included: Shows both CLI flag (--types) and config file approach
• Helpful context: Explains what the feature does and provides a complete working example

Markdown Headers ✅

• No h1/h2/h3 headers used (would break changelog formatting)
• Code blocks properly formatted

Package Coverage ✅

• Both affected packages are included (@cloudflare/workers-utils and wrangler)

The changeset effectively addresses the previous review feedback by including detailed usage examples and clear explanations of how to enable the feature.

[pkg-pr-new[bot]]

create-cloudflare

npm i https://pkg.pr.new/create-cloudflare@11616

@cloudflare/kv-asset-handler

npm i https://pkg.pr.new/@cloudflare/kv-asset-handler@11616

miniflare

npm i https://pkg.pr.new/miniflare@11616

@cloudflare/pages-shared

npm i https://pkg.pr.new/@cloudflare/pages-shared@11616

@cloudflare/unenv-preset

npm i https://pkg.pr.new/@cloudflare/unenv-preset@11616

@cloudflare/vite-plugin

npm i https://pkg.pr.new/@cloudflare/vite-plugin@11616

@cloudflare/vitest-pool-workers

npm i https://pkg.pr.new/@cloudflare/vitest-pool-workers@11616

@cloudflare/workers-editor-shared

npm i https://pkg.pr.new/@cloudflare/workers-editor-shared@11616

@cloudflare/workers-utils

npm i https://pkg.pr.new/@cloudflare/workers-utils@11616

wrangler

npm i https://pkg.pr.new/wrangler@11616

commit: 8a2c8fb