fix: now working as a loader

package.json

@@ -33,8 +33,5 @@
 		"rimraf": "^6.0.1",
 		"typescript": "^5.5.3"
 	},
-	"files": [
-		"dist",
-		"LICENSE.md"
-	]
+	"files": ["dist", "LICENSE.md"]
 }

src/loader.ts

@@ -1,14 +1,25 @@
-import swc from "../lib/wasm.js";
-import type { LoadHook } from "node:module";
-import { readFile } from "node:fs/promises";
+import type { LoadFnOutput, LoadHookContext } from "node:module";
+import { transformSync } from "./index.ts";
 
-export const load: LoadHook = async (source, context, nextLoad) => {
-	if (context.format?.includes("typescript")) {
-		const data = await readFile(source, "utf8");
+type NextLoad = (
+	url: string,
+	context?: LoadHookContext,
+) => LoadFnOutput | Promise<LoadFnOutput>;
+
+export async function load(
+	url: string,
+	context: LoadHookContext,
+	nextLoad: NextLoad,
+) {
+	const { format } = context;
+	if (format.includes("typescript")) {
+		const { source = "" } = await nextLoad(url, context);
+		const { code } = transformSync(source.toString(), { mode: "transform" });
 		return {
-			source: swc.transformSync(data).code,
-			shortCircuit: true, // Skips bundled transpilation
+			format: format.replace("-typescript", ""),
+			source: code,
+			shortCircuit: true,
 		};
 	}
-	return { source: await nextLoad(source, context) };
-};
+	return { source: await nextLoad(url, context) };
+}

test/fixtures/enum.ts

@@ -1,4 +1,4 @@
 enum Foo {
-    A = "Hello, TypeScript!"
+	A = "Hello, TypeScript!",
 }
 console.log(Foo.A);

test/loader.test.js

@@ -6,7 +6,7 @@ test("should work as a loader", async () => {
 	const result = await spawnPromisified(process.execPath, [
 		"--experimental-strip-types",
 		"--no-warnings",
-		"--import=./dist/index.js",
+		"--loader=./dist/index.js",
 		fixturesPath("hello.ts"),
 	]);
 
@@ -19,7 +19,7 @@ test("should work with enums", async () => {
 	const result = await spawnPromisified(process.execPath, [
 		"--experimental-strip-types",
 		"--no-warnings",
-		"--import=./dist/index.js",
+		"--loader=./dist/index.js",
 		fixturesPath("enum.ts"),
 	]);