feat: add extendRollupConfig option

Author: egoist

src/index.ts

@@ -10,8 +10,6 @@ import stringWidth from 'string-width'
 import {
   rollup,
   watch,
-  InputOptions,
-  OutputOptions,
   Plugin as RollupPlugin,
   ModuleFormat as RollupFormat
 } from 'rollup'
@@ -32,7 +30,9 @@ import {
   ConfigEntryObject,
   Env,
   ConfigOutput,
-  FileNameContext
+  RunContext,
+  RollupConfig,
+  Task
 } from './types'
 
 // Make rollup-plugin-vue use basename in component.__file instead of absolute path
@@ -45,28 +45,6 @@ interface RunOptions {
   concurrent?: boolean
 }
 
-interface RunContext {
-  unresolved: Set<string>
-}
-
-interface Task {
-  title: string
-  getConfig(context: RunContext, task: Task): Promise<RollupConfigOutput>
-}
-
-interface RollupInputConfig extends InputOptions {
-  plugins: Array<RollupPlugin>
-}
-
-interface RollupOutputConfig extends OutputOptions {
-  dir: string
-}
-
-interface RollupConfigOutput {
-  inputConfig: RollupInputConfig
-  outputConfig: RollupOutputConfig
-}
-
 interface RollupConfigInput {
   source: {
     input: string[] | ConfigEntryObject
@@ -171,7 +149,7 @@ export class Bundler {
     context,
     assets,
     config
-  }: RollupConfigInput): Promise<RollupConfigOutput> {
+  }: RollupConfigInput): Promise<RollupConfig> {
     // Always minify if config.minify is truthy
     // Otherwise infer by format
     const minify =
@@ -560,14 +538,17 @@ export class Bundler {
                   format
                 })
               : this.config
-            return this.createRollupConfig({
+            const rollupConfig = await this.createRollupConfig({
               source,
               format,
               title: task.title,
               context,
               assets,
               config
             })
+            return this.config.extendRollupConfig
+              ? this.config.extendRollupConfig(rollupConfig)
+              : rollupConfig
           }
         })
       }

src/types.ts

@@ -1,4 +1,9 @@
-import { ModuleFormat as RollupFormat } from 'rollup'
+import {
+  ModuleFormat as RollupFormat,
+  InputOptions,
+  OutputOptions,
+  Plugin as RollupPlugin
+} from 'rollup'
 
 import { Banner } from './utils/get-banner'
 
@@ -35,6 +40,30 @@ export type ExtendConfig = (
   { format, input }: { format: Format; input: string[] | ConfigEntryObject }
 ) => NormalizedConfig
 
+export interface RunContext {
+  unresolved: Set<string>
+}
+
+export interface Task {
+  title: string
+  getConfig(context: RunContext, task: Task): Promise<RollupConfig>
+}
+
+export interface RollupInputConfig extends InputOptions {
+  plugins: Array<RollupPlugin>
+}
+
+export interface RollupOutputConfig extends OutputOptions {
+  dir: string
+}
+
+export interface RollupConfig {
+  inputConfig: RollupInputConfig
+  outputConfig: RollupOutputConfig
+}
+
+export type ExtendRollupConfig = (config: RollupConfig) => RollupConfig
+
 export interface FileNameContext {
   format: RollupFormat
   minify: boolean
@@ -252,7 +281,14 @@ export interface Config {
    * Configure the default babel preset
    */
   babel?: BabelPresetOptions
+  /**
+   * Extending Bili config
+   */
   extendConfig?: ExtendConfig
+  /**
+   * Extending generated rollup config
+   */
+  extendRollupConfig?: ExtendRollupConfig
 }
 
 interface ConfigOutputOverwrite {
@@ -280,6 +316,7 @@ export interface NormalizedConfig {
   banner?: Banner
   babel: BabelPresetOptions
   extendConfig?: ExtendConfig
+  extendRollupConfig?: ExtendRollupConfig
 }
 
 export interface Options {