Code optimization

src/fast_transformer.js

@@ -58,14 +58,14 @@ export class FastTransformer {
 	 */
 	async listen() {
 		if (this.#process) return this.#port;
-
 		this.#port = await getPort();
-		return new Promise((fulfill, reject) => {
-			const args = ["-S", `${FastTransformer.#address}:${this.#port}`, "-t", import.meta.dirname];
-			this.#process = spawn(this.#executable, args, {stdio: ["ignore", "pipe", "ignore"]});
-			this.#process.on("error", reject);
-			this.#process.on("spawn", () => setTimeout(() => fulfill(this.#port), 1_000));
-		});
+
+		const {promise, reject, resolve: fulfill} = Promise.withResolvers();
+		const args = ["-S", `${FastTransformer.#address}:${this.#port}`, "-t", import.meta.dirname];
+		this.#process = spawn(this.#executable, args, {stdio: ["ignore", "pipe", "ignore"]});
+		this.#process.on("error", reject);
+		this.#process.on("spawn", () => setTimeout(() => fulfill(this.#port), 1_000));
+		return promise;
 	}
 
 	/**

src/safe_transformer.js

@@ -35,11 +35,12 @@ export class SafeTransformer {
 	 * @returns {Promise<string>} The transformed script.
 	 */
 	transform(file) {
-		const maxBuffer = 20 * 1_024 * 1_024;
-		// eslint-disable-next-line no-promise-executor-return
-		return new Promise((fulfill, reject) => execFile(this.#executable, ["-w", resolve(file)], {maxBuffer}, (error, stdout) => {
+		const {promise, reject, resolve: fulfill} = Promise.withResolvers();
+		execFile(this.#executable, ["-w", resolve(file)], {maxBuffer: 20 * 1_024 * 1_024}, (error, stdout) => {
 			if (error) reject(error);
 			else fulfill(stdout);
-		}));
+		});
+
+		return promise;
 	}
 }