refactor: external option

src/index.ts

@@ -9,6 +9,7 @@ import jsonPlugin from '@rollup/plugin-json'
 import dtsPlugin from 'rollup-plugin-dts'
 import { sizePlugin, caches } from './size-plugin'
 import { resolvePlugin } from './resolve-plugin'
+import { isExternal } from './utils'
 
 type Options = {
   bundle?: boolean
@@ -55,12 +56,20 @@ export async function createRollupConfigs(files: string[], options: Options) {
             external: options.external,
             dts,
           }),
-          !dts && commonjsPlugin({
-            namedExports: {
-              // commonjs plugin failed to detect named exports for `resolve`, TODO: report this bug
-              resolve: Object.keys(require('resolve')),
-            },
-          }),
+          !dts &&
+            commonjsPlugin({
+              namedExports: {
+                // commonjs plugin failed to detect named exports for `resolve`, TODO: report this bug
+                resolve: Object.keys(require('resolve')),
+              },
+              // @ts-ignore wrong typing in @rollup/plugin-commonjs
+              ignore:(name: string) => {
+                if (!options.external) {
+                  return false
+                }
+                return isExternal(options.external, name)
+              },
+            }),
           dts && dtsPlugin(),
           !dts &&
             esbuildPlugin({
@@ -78,7 +87,7 @@ export async function createRollupConfigs(files: string[], options: Options) {
         dir: options.outDir,
         format: options.format,
         exports: 'named',
-        name: options.moduleName
+        name: options.moduleName,
       },
     }
   }

src/resolve-plugin.ts

@@ -3,6 +3,7 @@ import { dirname } from 'path'
 import { Plugin } from 'rollup'
 import JoyCon from 'joycon'
 import nodeResolvePlugin from '@rollup/plugin-node-resolve'
+import { isExternal } from './utils'
 
 const PACKAGE_NAME_RE = /^[@a-z]/
 
@@ -40,7 +41,7 @@ export const resolvePlugin = ({
         const cwd = importer && dirname(importer)
         if (cwd && PACKAGE_NAME_RE.test(source)) {
           // Exclude specified packages
-          if (external && external.includes(source)) {
+          if (external && isExternal(external, source, importer)) {
             return false
           }
 

src/utils.ts

@@ -0,0 +1,39 @@
+// No backslash in path
+function slash(input: string) {
+  return input.replace(/\\/g, '/')
+}
+
+export type External = string | RegExp | ((id: string, parentId?: string) => boolean)
+
+export function isExternal(
+  externals: External | External[],
+  id: string,
+  parentId?: string
+) {
+  id = slash(id)
+
+  if (!Array.isArray(externals)) {
+    externals = [externals]
+  }
+
+  for (const external of externals) {
+    if (
+      typeof external === 'string' &&
+      (id === external || id.includes(`/node_modules/${external}/`))
+    ) {
+      return true
+    }
+    if (external instanceof RegExp) {
+      if (external.test(id)) {
+        return true
+      }
+    }
+    if (typeof external === 'function') {
+      if (external(id, parentId)) {
+        return true
+      }
+    }
+  }
+
+  return false
+}