Treat trailing-slash exports keys as wildcards

.changeset/trailing-slash-wildcards.md

@@ -0,0 +1,5 @@
+---
+"@arethetypeswrong/core": patch
+---
+
+Treat trailing-slash `exports` keys as wildcard entrypoints.

packages/core/src/internal/getEntrypointInfo.ts

@@ -160,7 +160,8 @@ function getEntrypointResolution(
   resolutionKind: ResolutionKind,
   entrypoint: string,
 ): EntrypointResolutionAnalysis {
-  if (entrypoint.includes("*")) {
+  // A trailing slash is the folder-mapping form of `./dir/*`
+  if (entrypoint.includes("*") || entrypoint.endsWith("/")) {
     return { name: entrypoint, resolutionKind, isWildcard: true };
   }
   const moduleSpecifier = packageName + entrypoint.substring(1); // remove leading . before slash

packages/core/test/getEntrypointInfo.test.ts

@@ -34,4 +34,33 @@ describe("getEntrypointInfo", () => {
     assert("entrypoints" in result);
     assert.deepStrictEqual(Object.keys(result.entrypoints), ["./features/*.js", "./browser"]);
   });
+
+  test("treats trailing-slash exports keys as wildcards", async () => {
+    const result = await checkPackage(
+      createTestPackage({
+        "es/index.d.ts": "export {};",
+        "es/index.js": "export {};",
+        "index.d.ts": "export {};",
+        "index.js": "export {};",
+        "package.json": JSON.stringify({
+          name: "test",
+          version: "1.0.0",
+          exports: {
+            ".": "./index.js",
+            "./es/": "./es/",
+            "./es/*": "./es/*.js",
+          },
+        }),
+      }),
+    );
+
+    assert("entrypoints" in result);
+    assert.deepStrictEqual(Object.keys(result.entrypoints), [".", "./es/", "./es/*"]);
+    assert(result.entrypoints["./es/"].isWildcard);
+    assert(Object.values(result.entrypoints["./es/"].resolutions).every((r) => r.isWildcard && !r.resolution));
+    assert.deepStrictEqual(
+      result.problems.filter((p) => "entrypoint" in p && p.entrypoint === "./es/"),
+      [],
+    );
+  });
 });