Merge pull request #2 from 2fd/fix/preserve-ts-packages

fix: preserve extension if the import is a package

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` |

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());
         }