fix(rollup): handle aliases when checking for externals (#384)

src/builder/rollup.ts

@@ -319,6 +319,7 @@ const getChunkFilename = (
 };
 
 export function getRollupOptions(ctx: BuildContext): RollupOptions {
+  const _aliases = resolveAliases(ctx);
   return (<RollupOptions>{
     input: Object.fromEntries(
       ctx.options.entries
@@ -361,6 +362,7 @@ export function getRollupOptions(ctx: BuildContext): RollupOptions {
     ].filter(Boolean),
 
     external(id) {
+      id = resolveAlias(id, _aliases);
       const pkg = getpkg(id);
       const isExplicitExternal =
         arrayIncludes(ctx.options.externals, pkg) ||
@@ -402,7 +404,7 @@ export function getRollupOptions(ctx: BuildContext): RollupOptions {
       ctx.options.rollup.alias &&
         alias({
           ...ctx.options.rollup.alias,
-          entries: resolveAliases(ctx),
+          entries: _aliases,
         }),
 
       ctx.options.rollup.resolve &&
@@ -470,6 +472,16 @@ function resolveAliases(ctx: BuildContext) {
   return aliases;
 }
 
+// TODO: use pathe utils to handle nested aliases
+function resolveAlias(id: string, aliases: Record<string, string>): string {
+  for (const [find, replacement] of Object.entries(aliases)) {
+    if (id.startsWith(find)) {
+      return id.replace(find, replacement);
+    }
+  }
+  return id;
+}
+
 export function _watch(rollupOptions: RollupOptions) {
   const watcher = rollupWatch(rollupOptions);