breaking: remove legacy package.json files (#8515)

Author: benmccann

CHANGELOG.md

@@ -3,7 +3,8 @@
 ## Unreleased (4.0)
 
 * **breaking** Minimum supported Node version is now Node 14
-* **breaking** Minimum supported TypeScript version is now 5 (it will likely work with lower versions, but we make no guarantess about that)
+* **breaking** Minimum supported webpack version is now webpack 5
+* **breaking** Minimum supported TypeScript version is now TypeScript 5 (it will likely work with lower versions, but we make no guarantees about that)
 * **breaking** Stricter types for `createEventDispatcher` (see PR for migration instructions) ([#7224](https://github.com/sveltejs/svelte/pull/7224))
 * **breaking** Stricter types for `Action` and `ActionReturn` (see PR for migration instructions) ([#7224](https://github.com/sveltejs/svelte/pull/7224))
 * **breaking** Stricter types for `onMount` - now throws a type error when returning a function asynchronously to catch potential mistakes around callback functions (see PR for migration instructions) ([#8136](https://github.com/sveltejs/svelte/pull/8136))

rollup.config.mjs

@@ -89,19 +89,6 @@ export default [
 							}
 						}
 
-						fs.writeFileSync(
-							`${dir}/package.json`,
-							JSON.stringify(
-								{
-									main: './index.js',
-									module: './index.mjs',
-									types: './index.d.ts',
-								},
-								null,
-								'  '
-							)
-						);
-
 						fs.writeFileSync(
 							`${dir}/index.d.ts`,
 							`export * from '../types/runtime/${dir}/index.js';`