From e602bc1ac9adaa9b8cdab99b8eff650e2ea46b99 Mon Sep 17 00:00:00 2001
From: Pooya Parsa <pooya@pi0.io>
Date: Thu, 11 Jan 2024 12:31:22 +0100
Subject: [PATCH] refactor: expose as `defaultName`

---
 src/analyze.ts       | 28 +++-------------------------
 test/exports.test.ts | 11 ++++++++++-
 2 files changed, 13 insertions(+), 26 deletions(-)

diff --git a/src/analyze.ts b/src/analyze.ts
index 6a38524..f53017e 100644
--- a/src/analyze.ts
+++ b/src/analyze.ts
@@ -40,6 +40,7 @@ export interface ESMExport {
   start: number;
   end: number;
   name?: string;
+  defaultName?: string;
   names: string[];
   specifier?: string;
 }
@@ -80,12 +81,8 @@ const EXPORT_NAMED_DESTRUCT =
   /\bexport\s+(let|var|const)\s+(?:{(?<exports1>[^}]+?)[\s,]*}|\[(?<exports2>[^\]]+?)[\s,]*])\s+=/gm;
 const EXPORT_STAR_RE =
   /\bexport\s*(\*)(\s*as\s+(?<name>[\w$]+)\s+)?\s*(\s*from\s*["']\s*(?<specifier>(?<="\s*)[^"]*[^\s"](?=\s*")|(?<='\s*)[^']*[^\s'](?=\s*'))\s*["'][^\n;]*)?/g;
-// updated export default to prevent duplication when named export deafult happen
 const EXPORT_DEFAULT_RE =
-  /\bexport\s+default\s+(async function|function|class|true|false|(\W\D)|\d)/g;
-// named export default
-const EXPORT_NAMED_DEFAULT_RE =
-  /\bexport\s+default\s+(?!async function|function|class|true|false|\W|\d)\w*/g;
+  /\bexport\s+default\s+(async function|function|class|true|false|(\W\D)|\d)|\bexport\s+default\s+(?!async function|function|class|true|false|\W|\d)(?<defaultName>\w+)/g;
 const TYPE_RE = /^\s*?type\s/;
 
 export function findStaticImports(code: string): StaticImport[] {
@@ -210,20 +207,6 @@ export function findExports(code: string): ESMExport[] {
     name: "default",
   });
 
-  // Find export default
-  const namedDefaultExport: DefaultExport[] = matchAll(
-    EXPORT_NAMED_DEFAULT_RE,
-    code,
-    {
-      type: "namedDefault",
-      code,
-    },
-  ).map((exp) => {
-    exp.name = "default";
-
-    return exp;
-  });
-
   // Find export star
   const starExports: ESMExport[] = matchAll(EXPORT_STAR_RE, code, {
     type: "star",
@@ -236,7 +219,6 @@ export function findExports(code: string): ESMExport[] {
     ...namedExports,
     ...destructuredExports,
     ...defaultExport,
-    ...namedDefaultExport,
     ...starExports,
   ]);
 
@@ -316,11 +298,7 @@ function normalizeExports(exports: ESMExport[]) {
     if (!exp.name && exp.names && exp.names.length === 1) {
       exp.name = exp.names[0];
     }
-    if (
-      exp.name === "default" &&
-      exp.type !== "default" &&
-      exp.type !== "namedDefault"
-    ) {
+    if (exp.name === "default" && exp.type !== "default") {
       exp._type = exp.type;
       exp.type = "default";
     }
diff --git a/test/exports.test.ts b/test/exports.test.ts
index e8f6f85..c4ed759 100644
--- a/test/exports.test.ts
+++ b/test/exports.test.ts
@@ -22,7 +22,7 @@ describe("findExports", () => {
       type: "named",
     },
     "export default foo": {
-      type: "namedDefault",
+      type: "default",
       name: "default",
       names: ["default"],
     },
@@ -53,6 +53,12 @@ describe("findExports", () => {
     "export async function* foo ()": { type: "declaration", names: ["foo"] },
     "export async function *foo ()": { type: "declaration", names: ["foo"] },
     "export const $foo = () => {}": { type: "declaration", names: ["$foo"] },
+    "export default something": {
+      type: "default",
+      name: "default",
+      defaultName: "something",
+      names: ["default"],
+    },
     "export { foo as default }": {
       type: "default",
       name: "default",
@@ -95,6 +101,9 @@ describe("findExports", () => {
       if (test.specifier) {
         expect(match.specifier).toEqual(test.specifier);
       }
+      if (test.defaultName) {
+        expect(match.defaultName).toEqual(test.defaultName);
+      }
     });
   }
   it("handles multiple exports", () => {