feat: add svelte

the functionality for a svelte package
isn't here yet though :(

templates/svelte/.envrc

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+use flake ".#"

templates/svelte/.gitignore

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+node_modules
+
+# Output
+.output
+.vercel
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
+
+# Nix
+**/result
+/.direnv

templates/svelte/.npmrc

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+engine-strict=true

templates/svelte/.prettierignore

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+# Package Managers
+package-lock.json
+pnpm-lock.yaml
+yarn.lock

templates/svelte/.prettierrc

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+{
+	"useTabs": true,
+	"singleQuote": true,
+	"trailingComma": "none",
+	"printWidth": 100,
+	"plugins": ["prettier-plugin-svelte"],
+	"overrides": [{ "files": "*.svelte", "options": { "parser": "svelte" } }]
+}

templates/svelte/README.md

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+# create-svelte
+
+Everything you need to build a Svelte project, powered by [`create-svelte`](https://github.com/sveltejs/kit/tree/main/packages/create-svelte).
+
+## Creating a project
+
+If you're seeing this, you've probably already done this step. Congrats!
+
+```bash
+# create a new project in the current directory
+npm create svelte@latest
+
+# create a new project in my-app
+npm create svelte@latest my-app
+```
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```bash
+npm run dev
+
+# or start the server and open the app in a new browser tab
+npm run dev -- --open
+```
+
+## Building
+
+To create a production version of your app:
+
+```bash
+npm run build
+```
+
+You can preview the production build with `npm run preview`.
+
+> To deploy your app, you may need to install an [adapter](https://kit.svelte.dev/docs/adapters) for your target environment.

templates/svelte/eslint.config.js

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+import js from '@eslint/js';
+import ts from 'typescript-eslint';
+import svelte from 'eslint-plugin-svelte';
+import prettier from 'eslint-config-prettier';
+import globals from 'globals';
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+	js.configs.recommended,
+	...ts.configs.recommended,
+	...svelte.configs['flat/recommended'],
+	prettier,
+	...svelte.configs['flat/prettier'],
+	{
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				...globals.node
+			}
+		}
+	},
+	{
+		files: ['**/*.svelte'],
+		languageOptions: {
+			parserOptions: {
+				parser: ts.parser
+			}
+		}
+	},
+	{
+		ignores: ['build/', '.svelte-kit/', 'dist/']
+	}
+];

templates/svelte/flake.lock

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+{
+	"nodes": {
+		"nixpkgs": {
+			"locked": {
+				"lastModified": 1725930920,
+				"narHash": "sha256-RVhD9hnlTT2nJzPHlAqrWqCkA7T6CYrP41IoVRkciZM=",
+				"owner": "NixOS",
+				"repo": "nixpkgs",
+				"rev": "44a71ff39c182edaf25a7ace5c9454e7cba2c658",
+				"type": "github"
+			},
+			"original": {
+				"owner": "NixOS",
+				"ref": "nixos-24.05",
+				"repo": "nixpkgs",
+				"type": "github"
+			}
+		},
+		"root": {
+			"inputs": {
+				"nixpkgs": "nixpkgs"
+			}
+		}
+	},
+	"root": "root",
+	"version": 7
+}

templates/svelte/flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+  };
+
+  outputs =
+    { nixpkgs, ... }:
+    let
+      lib = nixpkgs.lib;
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+      ];
+      forAllSystems = f: lib.genAttrs systems (system: f { pkgs = nixpkgs.legacyPackages.${system}; });
+    in
+    {
+      formatter = forAllSystems ({ pkgs }: pkgs.nixfmt-rfc-style);
+      devShells = forAllSystems (
+        { pkgs }:
+        {
+          default = pkgs.callPackage ./flake/devshell.nix { };
+        }
+      );
+      packages = forAllSystems (
+        { pkgs }:
+        {
+          svelte-example = pkgs.callPackage ./flake/derivation.nix { };
+        }
+      );
+    };
+}

templates/svelte/flake/derivation.nix

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+{ mkYarnPackage }:
+let
+  pname = "svelte-example";
+  version = "0.1.0";
+in
+mkYarnPackage {
+  inherit pname version;
+  src = ../.;
+  yarnLock = ../yarn.lock;
+  yarnNix = ../yarn.nix;
+  packageJSON = ../package.json;
+}

templates/svelte/flake/devshell.nix

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+{
+  mkShell,
+  nodePackages_latest,
+  typescript,
+  yarn2nix,
+  nixd,
+}:
+mkShell {
+  name = "svelte";
+  packages = builtins.attrValues {
+    inherit (nodePackages_latest)
+      nodejs
+      npm
+      yarn
+      typescript-language-server
+      prettier
+      svelte-language-server
+      eslint
+      ;
+    inherit yarn2nix typescript nixd;
+  };
+}

templates/svelte/package.json

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+{
+	"name": "svelte-example",
+	"version": "0.0.1",
+  "description": "desc. of svelte-example",
+	"private": true,
+	"main": "index.js",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"lint": "prettier --check . && eslint .",
+		"format": "prettier --write .",
+		"start": "electron ."
+	},
+	"devDependencies": {
+		"@sveltejs/adapter-auto": "^3.0.0",
+		"@sveltejs/kit": "^2.0.0",
+		"@sveltejs/vite-plugin-svelte": "^3.0.0",
+		"@types/eslint": "^9.6.0",
+		"eslint": "^9.0.0",
+		"eslint-config-prettier": "^9.1.0",
+		"eslint-plugin-svelte": "^2.36.0",
+		"globals": "^15.0.0",
+		"prettier": "^3.1.1",
+		"prettier-plugin-svelte": "^3.1.2",
+		"svelte": "^4.2.7",
+		"svelte-check": "^4.0.0",
+		"typescript": "^5.0.0",
+		"typescript-eslint": "^8.0.0",
+		"vite": "^5.0.3"
+	},
+	"type": "module",
+	"dependencies": {}
+}

templates/svelte/src/app.d.ts

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+// See https://kit.svelte.dev/docs/types#app
+// for information about these interfaces
+declare global {
+	namespace App {
+		// interface Error {}
+		// interface Locals {}
+		// interface PageData {}
+		// interface PageState {}
+		// interface Platform {}
+	}
+}
+
+export {};

templates/svelte/src/app.html

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+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<link rel="icon" href="%sveltekit.assets%/favicon.png" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		%sveltekit.head%
+	</head>
+	<body data-sveltekit-preload-data="hover">
+		<div style="display: contents">%sveltekit.body%</div>
+	</body>
+</html>

templates/svelte/src/lib/index.ts

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+// place files you want to import through the `$lib` alias in this folder.

templates/svelte/src/routes/+page.svelte

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+<h1>Welcome to SvelteKit</h1>
+<p>Visit <a href="https://kit.svelte.dev">kit.svelte.dev</a> to read the documentation</p>

templates/svelte/svelte.config.js

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+import adapter from '@sveltejs/adapter-auto';
+import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+	// Consult https://kit.svelte.dev/docs/integrations#preprocessors
+	// for more information about preprocessors
+	preprocess: vitePreprocess(),
+
+	kit: {
+		// adapter-auto only supports some environments, see https://kit.svelte.dev/docs/adapter-auto for a list.
+		// If your environment is not supported, or you settled on a specific environment, switch out the adapter.
+		// See https://kit.svelte.dev/docs/adapters for more information about adapters.
+		adapter: adapter()
+	}
+};
+
+export default config;

templates/svelte/tsconfig.json

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+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"strict": true,
+		"moduleResolution": "bundler"
+	}
+	// Path aliases are handled by https://kit.svelte.dev/docs/configuration#alias
+	// except $lib which is handled by https://kit.svelte.dev/docs/configuration#files
+	//
+	// If you want to overwrite includes/excludes, make sure to copy over the relevant includes/excludes
+	// from the referenced tsconfig.json - TypeScript does not merge them in
+}

templates/svelte/vite.config.ts

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+import { sveltekit } from '@sveltejs/kit/vite';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+	plugins: [sveltekit()]
+});