fix(commonjs)!: remove namedExports from types (#410)

BREAKING CHANGE

Author: JounQin

packages/commonjs/types/index.d.ts

@@ -35,12 +35,6 @@ interface RollupCommonJSOptions {
    * @default false
    */
   transformMixedEsModules?: boolean;
-  /**
-   * explicitly specify unresolvable named exports
-   * ([see below for more details](https://github.com/rollup/plugins/tree/master/packages/commonjs#named-exports))
-   * @default undefined
-   */
-  namedExports?: { [package: string]: ReadonlyArray<string> };
   /**
    * sometimes you have to leave require statements
    * unconverted. Pass an array containing the IDs