Force using TypeScript (force lang='ts')

[bosung90]

It is far too easy to forget to put lang='ts'.
Can we have a feature similar to vue-block-lang
https://eslint.vuejs.org/rules/block-lang.html#vue-block-lang

[s1gr1d]

This is possible with an eslint rule: sveltejs/eslint-plugin-svelte#380

I have the following setup:

module.exports = {
	root: true,
	extends: [
		'eslint:recommended',
		'plugin:@typescript-eslint/recommended',
		'plugin:svelte/recommended',
		'prettier'
	],
	rules: {
		'svelte/block-lang': [
			'error',
			{
				enforceScriptPresent: false,
				enforceStylePresent: false,
				script: ['ts'], // enforce TS
				style: ['scss'] // enforce scss
			}
		]
	},
}