fix: avoid assigning to bundle object

[sapphi-red]

Description

Assigning to bundle object is discouraged by rollup and is not supported by rolldown.

This PR changes the code using assignment to use this.emitFile instead. This would make vite-plugin-pwa work with Rolldown powered Vite.

If the plugin context is not passed to api.generateBundle, it will still use the previous method for backward compat.

Linked Issues

Additional Context

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[userquin]

Thx ❤️ , I need to include this in Vite 6 Env. Api pr

[pkg-pr-new]

npm i https://pkg.pr.new/vite-plugin-pwa@843

commit: 6ebab07

[userquin]

I'm checking integrations with a local tgz from this PR:

• SvelteKit: WIP
• Nuxt: looks like I need to check it with latest Nuxt, using 3.10 seems to be not working, the web manifest not being generated in the dist folder, and so I need to use the api.generateBundle without the plugin context

I'm checking also if we need to add the emit for FILE_SW_REGISTER asset via plugin context, just a few lines below changes in the api module:

[sapphi-red]

I'm checking also if we need to add the emit for FILE_SW_REGISTER asset via plugin context, just a few lines below changes in the api module:

Ah, yes, that should be changed as well. I'll update the PR.

[userquin]

@sapphi-red just a question about vite and rolldown: we've small problem importing stuff from rollup, we should import rollup types from vite, but OutputAsset used in the api.ts module here not being re-exported by vite 5.0.12 (we should also update src/types.ts), so using rolldown will require a breaking dropping support for older Vite versions. Do you have any hint about this?

NOTE: I don't want to change the imports here, it is fine, just doing final SvelteKit test...

[userquin]

thx ❤️