Cleanup unused JSX code

[bluwy]

Changes

linear issue: PLT-1935

Removes unused code as previously I've refactored the logic into @astrojs/mdx already:

• astro/jsx/babel.js
• astro/jsx/component.js
• astro/jsx/index.js
• astro/jsx/renderer.js
• astro/jsx/server.js (moved to @astrojs/mdx/server.js)
• astro/jsx/transform-options.js

There's only astro/jsx/rehype.js left as it includes code tied to the astro metadata by Vite plugins. We could move it into @astrojs/mdx too, but that may expose more internal stuff than wanted.

Testing

Existing tests should pass. I also deleted some outdated jsx test for this.

Docs

I added a major changeset to astro, and only a minor for @astrojs/mdx as the change there is technically not breaking. I expect that this change shouldn't affect many people as long as they have @astrojs/mdx v3, which was released since 9th May 2024.

[changeset-bot]

🦋 Changeset detected

Latest commit: 84d91d7

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

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[github-actions]

This PR is blocked because it contains a major changeset. A reviewer will merge this at the next release if approved.

[ematipico]

This change must be reflected in the following places:

astro/packages/astro/src/jsx/renderer.ts

Line 6 in d12dcbf

serverEntrypoint: 'astro/jsx/server.js',

astro/packages/integrations/mdx/src/index.ts

Lines 37 to 42 in d12dcbf

	export function getContainerRenderer(): ContainerRenderer {
	return {
	name: 'astro:jsx',
	serverEntrypoint: 'astro/jsx/server.js',
	};
	}

[bluwy]

The first one will be removed, and the second is already updated?

[sarah11918]

@bluwy Is there a linear task in the 5.0 project associated with this breaking change? I think this should be added to the breaking changes section of the upgrade guide, and I've been tracking that we don't miss any of those by Linear issue number.

[bluwy]

Sorry this is related to PLT-1935 but I forgot to link it back. Yeah I'm planning to write this in the migration guide once the docs/changesets here are reviewed.

[sarah11918]

Looks good @bluwy ! I don't think you need to go full "breaking change upgrade guide format" on the Astro major, but I still would like that in the 5.0 upgrade guide when it comes time! Some thoughts below for your consideration!