Cleanup NPM packages and Rollup config

package.json

@@ -50,11 +50,8 @@
     "postcss-preset-env": "^6.7.0",
     "rollup": "^1.32.0",
     "rollup-plugin-babel": "^4.3.3",
-    "rollup-plugin-commonjs": "^10.1.0",
     "rollup-plugin-eslint": "^7.0.0",
-    "rollup-plugin-hot": "^0.0.13",
     "rollup-plugin-svelte": "^5.1.1",
-    "rollup-plugin-svelte-hot": "^0.4.0",
     "rollup-plugin-terser": "^5.2.0",
     "sapper": "^0.27.10",
     "svelte": "^3.19.1",

rollup.config.js

@@ -1,12 +1,10 @@
 import resolve from '@rollup/plugin-node-resolve'
 import replace from '@rollup/plugin-replace'
 import commonjs from '@rollup/plugin-commonjs'
-// import svelte from 'rollup-plugin-svelte-hot'
 import svelte from 'rollup-plugin-svelte'
 import babel from 'rollup-plugin-babel'
 // import { eslint } from 'rollup-plugin-eslint'
 // import browsersync from 'rollup-plugin-browsersync'
-// import hmr from 'rollup-plugin-hot'
 import sveltePreprocess from 'svelte-preprocess'
 import { terser } from 'rollup-plugin-terser'
 import config from 'sapper/config/rollup'
@@ -16,7 +14,6 @@ import pkg from './package.json'
 const mode = process.env.NODE_ENV
 const dev = mode === 'development'
 const legacy = !!process.env.SAPPER_LEGACY_BUILD
-const hot = dev
 
 // Svelte
 const onwarn = (warning, onwarn) => (warning.code === 'CIRCULAR_DEPENDENCY' && /[/\\]@sapper[/\\]/.test(warning.message)) || onwarn(warning)
@@ -38,25 +35,14 @@ export default {
 			...config.client.output(),
 			...dev && { exports: 'named' }
 		},
-		// experimentalCodeSplitting: true,
+		experimentalCodeSplitting: true,
 		plugins: [
 			// Javascript
 			svelte({
 				dev,
 				preprocess,
 				hydratable: true,
-				emitCss: true,
+				emitCss: true
-				// ...(!dev && {
-				css: css => css.write('static/bundle.css', dev),
-				// }),
-				// hot: hot && {
-				// 	// sapper-dev-client expects either webpack or rollup with no HMR, so
-				// 	// we need to prevent it from doing full reloads with rollup
-				// 	patchSapperDevClient: true,
-				// 	// optimistic will try to recover from runtime errors during
-				// 	// component init (instead of doing a full reload)
-				// 	optimistic: true,
-				// }
 			}),
 			replace({
 				'process.browser': true,
@@ -64,20 +50,16 @@ export default {
 			}),
 			resolve({
 				browser: true,
-				extensions: ['.mjs', '.js', '.json', '.html', '.svelte', '.scss'],
+				extensions: ['.mjs', '.js', '.svelte', '.scss', '.json', '.html'],
 				dedupe: ['svelte']
 			}),
 			commonjs(),
 			// dev && eslint(),
-			!dev && babel({
+			legacy && babel({
 				extensions: ['.js', '.mjs', '.html', '.svelte'],
 				exclude: ['*.scss', '*.css', 'node_modules/@babel/**'],
 				runtimeHelpers: true
 			}),
-			// hot && hmr({
-			// 	public: '__sapper__/dev',
-			// 	inMemory: true,
-			// }),
 
 			// Compress Javascript
 			!dev && terser({