feat: init addon

.gitignore

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

CONTRIBUTING.md

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+# Contributing Guide
+
+Cheatsheet: [All official add-ons source code](https://github.com/sveltejs/cli/tree/main/packages/sv/src/addons)
+
+---
+
+Some convenient scripts are provided to help develop the add-on.
+
+```sh
+## create a new minimal project in the `demo` directory
+npm run demo-create
+
+## add your current add-on to the demo project
+npm run demo-add
+
+## run the tests
+npm run test
+```
+
+## Key things to note
+
+Your `add-on` should:
+
+- export a function that returns a `defineAddon` object.
+- have a `package.json` with an `exports` field that points to the main entry point of the add-on.
+
+## Building
+
+Your add-on is bundled with [tsdown](https://tsdown.dev/) into a single file in `dist/`. This bundles everything except `sv` (which is a peer dependency provided at runtime).
+
+```sh
+npm run build
+```
+
+## Publishing
+
+When you're ready to publish your add-on to npm:
+
+```sh
+npm login
+npm publish
+```
+
+> `prepublishOnly` will automatically run the build before publishing.
+
+## Things to be aware of
+
+Community add-ons must have `sv` as a `peerDependency` and should **not** have any `dependencies`. Everything else (including `@sveltejs/sv-utils`) is bundled at build time by tsdown.

jsconfig.json

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+{
+	"compilerOptions": {
+		"strict": true,
+		"skipLibCheck": true,
+		"checkJs": true,
+		"module": "NodeNext",
+		"moduleResolution": "NodeNext"
+	}
+}

package.json

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+{
+	"name": "@msw/sveltekit",
+	"description": "sv add-on for Mock Service Worker",
+	"version": "0.0.1",
+	"type": "module",
+	"license": "MIT",
+	"scripts": {
+		"demo-create": "sv create demo --types ts --template minimal --no-add-ons --no-install",
+		"demo-add": "pnpm build && sv add file:../ --cwd demo --no-git-check --no-install",
+		"demo-add:ci": "pnpm build && sv add file:../=environments:browser,node --cwd demo --no-git-check --no-download-check --no-install",
+		"build": "tsdown",
+		"prepublishOnly": "npm run build",
+		"test": "vitest run"
+	},
+	"files": [
+		"dist"
+	],
+	"exports": {
+		".": {
+			"default": "./dist/index.mjs"
+		}
+	},
+	"publishConfig": {
+		"access": "public"
+	},
+	"peerDependencies": {
+		"sv": "^0.13.0"
+	},
+	"devDependencies": {
+		"@playwright/test": "^1.59.1",
+		"@sveltejs/sv-utils": "latest",
+		"@types/node": "^25.5.2",
+		"sv": "latest",
+		"tsdown": "^0.21.7",
+		"vitest": "^4.1.3"
+	},
+	"keywords": [
+		"sv-add",
+		"svelte",
+		"sveltekit"
+	]
+}