simplify return value

src/utils.ts

@@ -77,14 +77,12 @@ export function resolveAlias(path: string, aliases: Record<string, string>) {
 /**
  * Resolves a path string to its possible alias.
  *
- * Returns an array of possible alias resolutions, sorted by specificity (longest first).
- *
- * Returns `undefined` if no alias is found.
+ * Returns an array of possible alias resolutions (could be empty), sorted by specificity (longest first).
  */
 export function reverseResolveAlias(
   path: string,
   aliases: Record<string, string>,
-): undefined | string[] {
+): string[] {
   const _path = normalizeWindowsPath(path);
   aliases = normalizeAliases(aliases);
 
@@ -103,10 +101,8 @@ export function reverseResolveAlias(
     }
   }
 
-  return matches.length > 0
-    ? // Sort by length, longest (more specific) first
-      matches.sort((a, b) => b.length - a.length)
-    : undefined;
+  // Sort by length, longest (more specific) first
+  return matches.sort((a, b) => b.length - a.length);
 }
 
 /**

test/utils.spec.ts

@@ -85,8 +85,8 @@ describe("alias", () => {
     });
 
     it("no match", () => {
-      expect(reverseResolveAlias("foo/bar.js", aliases)).toBeUndefined();
-      expect(reverseResolveAlias("./bar.js", aliases)).toBeUndefined();
+      expect(reverseResolveAlias("foo/bar.js", aliases)).toMatchObject([]);
+      expect(reverseResolveAlias("./bar.js", aliases)).toMatchObject([]);
     });
 
     it("respect ending with /", () => {