From 2444b26edb6dae8b20ccb213097dc263ef28b535 Mon Sep 17 00:00:00 2001
From: Kevin Ross <kevin.ross@alienfast.com>
Date: Wed, 15 Jun 2022 11:17:32 -0500
Subject: [PATCH] Closes #28 - default mapping of sourc .ts import of
 unspecified extension should be  .js

---
 .gitignore                                  |  1 +
 lib/util/map-typescript-extension.js        |  1 +
 tests/lib/rules/file-extension-in-import.js | 16 ++++++++++++++++
 3 files changed, 18 insertions(+)

diff --git a/.gitignore b/.gitignore
index 826f9654..fedf77f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 /node_modules
 /test.js
 .eslintcache
+.vscode
\ No newline at end of file
diff --git a/lib/util/map-typescript-extension.js b/lib/util/map-typescript-extension.js
index 079d98d5..ecd3d9f2 100644
--- a/lib/util/map-typescript-extension.js
+++ b/lib/util/map-typescript-extension.js
@@ -4,6 +4,7 @@ const path = require("path")
 const isTypescript = require("../util/is-typescript")
 
 const mapping = {
+    "": ".js", // default empty extension will map to js
     ".ts": ".js",
     ".cts": ".cjs",
     ".mts": ".mjs",
diff --git a/tests/lib/rules/file-extension-in-import.js b/tests/lib/rules/file-extension-in-import.js
index 8c0b3628..651097f6 100644
--- a/tests/lib/rules/file-extension-in-import.js
+++ b/tests/lib/rules/file-extension-in-import.js
@@ -73,6 +73,10 @@ new RuleTester({
             filename: fixture("test.js"),
             code: "import './d.js'",
         },
+        {
+            filename: fixture("test.ts"),
+            code: "import './a.js'",
+        },
         {
             filename: fixture("test.ts"),
             code: "import './d.js'",
@@ -145,6 +149,18 @@ new RuleTester({
             output: "import './a.js'",
             errors: [{ messageId: "requireExt", data: { ext: ".js" } }],
         },
+        {
+            filename: fixture("test.ts"),
+            code: "import './a'",
+            output: "import './a.js'",
+            errors: [{ messageId: "requireExt", data: { ext: ".js" } }],
+        },
+        {
+            filename: fixture("test.ts"),
+            code: "import './d'",
+            output: "import './d.js'",
+            errors: [{ messageId: "requireExt", data: { ext: ".js" } }],
+        },
         {
             filename: fixture("test.js"),
             code: "import './b'",