feat(plugin-legacy): support additionalModernPolyfills

packages/plugin-legacy/README.md

@@ -74,7 +74,11 @@ npm add -D terser
 
  Add custom imports to the legacy polyfills chunk. Since the usage-based polyfill detection only covers ES language features, it may be necessary to manually specify additional DOM API polyfills using this option.
 
- Note: if additional polyfills are needed for both the modern and legacy chunks, they can simply be imported in the application source code.
+### `additionalModernPolyfills`
+
+- **Type:** `string[]`
+
+ Add custom imports to the modern polyfills chunk. Since the usage-based polyfill detection only covers ES language features, it may be necessary to manually specify additional DOM API polyfills using this option.
 
 ### `modernPolyfills`
 

packages/plugin-legacy/src/index.ts

@@ -166,6 +166,11 @@ function viteLegacyPlugin(options: Options = {}): Plugin[] {
  )
  })
  }
+ if (Array.isArray(options.additionalModernPolyfills)) {
+ options.additionalModernPolyfills.forEach((i) => {
+ modernPolyfills.add(i)
+ })
+ }
  if (Array.isArray(options.polyfills)) {
  options.polyfills.forEach((i) => {
  if (i.startsWith(`regenerator`)) {

packages/plugin-legacy/src/types.ts

@@ -12,6 +12,7 @@ export interface Options {
  */
  polyfills?: boolean | string[]
  additionalLegacyPolyfills?: string[]
+ additionalModernPolyfills?: string[]
  /**
  * default: false
  */