test: add tests for nativeClassProperties

src/loader.ts

@@ -1,5 +1,5 @@
-import assert from "node:assert";
 import type { LoadFnOutput, LoadHookContext } from "node:module";
+import type { Options } from "../lib/wasm";
 import { transformSync } from "./index.ts";
 
 type NextLoad = (
@@ -22,7 +22,9 @@ export async function load(
 		});
 		if (source == null)
 			throw new Error("Source code cannot be null or undefined");
-		const { code } = transformSync(source.toString(), { mode: "strip-only" });
+		const { code } = transformSync(source.toString(), {
+			mode: "strip-only",
+		} as Options);
 		return {
 			format: format.replace("-typescript", ""),
 			source: code,

src/transform.ts

@@ -1,9 +1,9 @@
 import type { Options, TransformOutput } from "../lib/wasm";
 import swc from "../lib/wasm.js";
 
-const DEFAULT_OPTIONS: Options = {
+const DEFAULT_OPTIONS = {
 	mode: "strip-only",
-};
+} as Options;
 
 export function transformSync(
 	source: string,

test/snapshots/transform.test.js.snapshot

@@ -49,3 +49,7 @@ exports[`should transform TypeScript private class fields 1`] = `
 exports[`should transform TypeScript type annotations and type guards 1`] = `
 "function isString(value) {\\n    return typeof value === 'string';\\n}\\nconst check = isString(\\"hello\\");\\noutput = check;\\n"
 `;
+
+exports[`test native class properties 1`] = `
+"class Foo {\\n    y;\\n    x;\\n    constructor(y = console.log(2)){\\n        this.y = y;\\n        this.x = console.log(1);\\n        console.log(3);\\n    }\\n}\\n"
+`;

test/transform.test.js

@@ -282,3 +282,22 @@ test("should transform TypeScript namespaces with additional functionality", (t)
 	assert.ok(result.validator);
 	assert.strictEqual(result.isValid, true);
 });
+
+test("test native class properties", (t) => {
+	const inputCode = `
+	class Foo {
+		x = console.log(1)
+		constructor(public y = console.log(2)) {
+			console.log(3)
+		}
+	}`;
+	const { code } = transformSync(inputCode, {
+		mode: "transform",
+		sourceMap: true,
+		transform: {
+			verbatimModuleSyntax: true,
+			nativeClassProperties: true,
+		},
+	});
+	t.assert.snapshot(code);
+});