internal - parseSvelte & ensureScript

[jycouet]

• typescript langTs ext... All expressing the same thing. Let's use ext all the time?
• ensureScript in parseSvelte directly ?

[changeset-bot]

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commit: 27ab04c

[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-cli-858-svelte.vercel.app/