feat: build library new option - emitAssets

vitejs#4454 vitejs#3295

Author: torsteinringnes

packages/vite/src/node/build.ts

@@ -212,6 +212,7 @@ export interface LibraryOptions {
   name?: string
   formats?: LibraryFormats[]
   fileName?: string | ((format: ModuleFormat) => string)
+  emitAssets?: boolean
 }
 
 export type LibraryFormats = 'es' | 'cjs' | 'umd' | 'iife'

packages/vite/src/node/plugins/asset.ts

@@ -287,7 +287,7 @@ async function fileToBuiltUrl(
 
   let url: string
   if (
-    config.build.lib ||
+    (config.build.lib && !config.build.lib.emitAssets) ||
     (!file.endsWith('.svg') &&
       content.length < Number(config.build.assetsInlineLimit))
   ) {