Merge pull request #2992 from sveltejs/appease-webpack

Change package.json stubs to work with webpack's module resolution

scripts/create-stubs.js

@@ -4,7 +4,7 @@ fs.readdirSync('src/runtime')
 	.filter(dir => fs.statSync(`src/runtime/${dir}`).isDirectory())
 	.forEach(dir => {
 		fs.writeFileSync(`${dir}/package.json`, JSON.stringify({
-			main: './index.js',
+			main: './index',
 			module: './index.mjs'
 		}, null, '  '));