Add option to turn off `index.html` read in `onRequest` hook

[jlenon7]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

Hey people, thank you so much for this package, really helpful!

I'm trying to create an integration using this package + Edge.js (template engine).

I created a project template, but I needed to change some things inside node_modules/@fastify/vite to get it working. I had to comment these lines:

fastify-vite/packages/fastify-vite/mode/development.js

Lines 84 to 96 in 169b718

	const indexHtmlPath = join(config.vite.root, 'index.html')
	const indexHtml = await read(indexHtmlPath, 'utf8')
	const transformedHtml = await this.devServer.transformIndexHtml(
	req.url,
	indexHtml,
	)
	// Set reply.html() function with latest version of index.html
	reply.html = await config.createHtmlFunction(
	transformedHtml,
	this.scope,
	config,
	)

Tip

Project template: https://github.com/jlenon7/vite-fastify.
After installing dependencies, use npm run dev to start it.

Since I'm using Edge.js for the template engine with multiple pages, I don't need the index.html entry point, instead I use app.scss and app.js as entry points as you can see inside my vite.config.js

Is there an easier way to create this integration? I had the idea to expose an option when registering @fastify/vite to turn index.html loading off inside onRequest hook. I would be happy to send a PR if you guys agree with the idea!

Motivation

No response

Example

No response

[galvez]

Would checking if index.html exists suffice?