From 9dbdf8dad8882b11d96dfdc4b83a1e1006325d46 Mon Sep 17 00:00:00 2001
From: frami <i@2fd.me>
Date: Wed, 17 Apr 2024 20:00:39 -0300
Subject: [PATCH 1/2] fix: preserve extension if the import is a package

---
 src/plugin.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/plugin.rs b/src/plugin.rs
index c7c75e6..44c8a64 100644
--- a/src/plugin.rs
+++ b/src/plugin.rs
@@ -11,7 +11,9 @@ pub struct Config {
 }
 
 fn replace_ts_extension(src: &ast::Str, config: &Config) -> Option<ast::Str> {
-    if src.value.ends_with(".ts") && !src.value.ends_with(".d.ts") {
+    if !src.value.starts_with('.') {
+        return None;
+    } else if src.value.ends_with(".ts") && !src.value.ends_with(".d.ts") {
         if let Some(file) = src.value.strip_suffix(".ts") {
             return Some(format!("{}.js", file).into());
         }

From f5b047070efffcfb313526af08c25021f50809d0 Mon Sep 17 00:00:00 2001
From: frami <i@2fd.me>
Date: Wed, 17 Apr 2024 20:42:53 -0300
Subject: [PATCH 2/2] docs: update README.md

---
 README.md | 59 ++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 50 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 68461fd..57db620 100644
--- a/README.md
+++ b/README.md
@@ -1,18 +1,59 @@
 # swc-plugin-allow-importing-ts-extensions
+
 SWC Plugin for allowImportingTsExtensions
 
+## When and Why
+
+If you are using SWC to transpile your TypeScript code, and your target is `es2016` or higher, you can use this plugin to import `.ts` files extensions (instead of `.js`), and it will be transpiled to `.js` files.
+
 ## Usage
 
+First, setup your `tsconfig.json` to allow importing `.ts` files extensions.
 
-```json
-  {
-  "$schema": "http://json.schemastore.org/swcrc",
-  "jsc": {
-    "experimental": {
-      "plugins": [
-        ["swc-plugin-allow-importing-ts-extensions", {}]
-      ]
-    }
+```json5
+// tsconfig.json
+{
+  compilerOptions: {
+    // ...
+    noEmit: true,
+    allowImportingTsExtensions: true,
   },
+  // ...
 }
 ```
+
+Then, add the plugin to your `.swcrc` file.
+
+```json5
+// .swcrc
+{
+  $schema: "http://json.schemastore.org/swcrc",
+  jsc: {
+    experimental: {
+      plugins: [["swc-plugin-allow-importing-ts-extensions", {}]],
+    },
+  },
+}
+```
+
+## Options
+
+```json5
+// .swcrc
+{
+  // ...
+  plugins: [
+    [
+      "swc-plugin-allow-importing-ts-extensions",
+      {
+        preserveImportExtension: true, // default: false
+      },
+    ],
+  ],
+  // ...
+}
+```
+
+| option                    | type      | default | description                                              |
+| ------------------------- | --------- | ------- | -------------------------------------------------------- |
+| `preserveImportExtension` | `boolean` | `false` | If `true` all imports with extension `.mts` and `.cts` with be map to `.mjs` and `.cjs` respectively, otherwise it will map to `.js` |