[wrangler] Fix modules-watch-stub injection when bundle:false (fixes …

[Sertug17]

Fixes #14845.

When bundle: false (e.g. no_bundle = true in wrangler.toml, or the --no-bundle flag), esbuild does not resolve imports in injected files. Previously modules-watch-stub.js was injected whenever watch: true, which left import "wrangler:modules-watch" unresolved in the output, causing workerd to crash at runtime:

Uncaught Error: No such module "wrangler:modules-watch"
imported from "pages-shim.js"

Reproducible with wrangler pages dev on a Nitro project using the cloudflare-module preset (generates no_bundle = true in wrangler.toml).

Fix: only inject the stub when bundle: true. When bundling is disabled, file watching is already handled by chokidar in use-esbuild.ts, so the esbuild-internal watch stub is not needed.

Checkboxes:

Tests: "Additional testing not necessary because:" → the watch stub injection path is tested via existing bundleWorker unit tests; no bundle mode is already covered by chokidar

---

[changeset-bot]

🦋 Changeset detected

Latest commit: 1af6db6

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

This PR includes changesets to release 3 packages

Name	Type
wrangler	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-pool-workers	Patch

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[Click here if you're a maintainer who wants to add another changeset to this PR](https://github.com/Sertug17/workers-sdk/new/fix/modules-watch-stub-no-bundle?filename=.changeset/ripe-chicken-hide.md&value=---%0A%22wrangler%22%3A%20patch%0A---%0A%0A%5Bwrangler%5D%20Fix%20modules-watch-stub%20injection%20when%20bundle%3Afalse%20(fixes%20%E2%80%A6%0A)

[Sertug17]

I have read the CLA Document and I hereby sign the CLA

[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• .changeset/fix-modules-watch-stub-no-bundle.md: [@cloudflare/wrangler]
• packages/wrangler/src/tests/api/startDevWorker/BundleController.test.ts: [@cloudflare/wrangler]
• packages/wrangler/src/deployment-bundle/bundle.ts: [@cloudflare/wrangler]

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commit: 1af6db6