fix: source maps in Node v21.6.0+ & v20.12.0+ (#518)

Co-authored-by: Hiroki Osame <hiroki.osame@gmail.com>

.nvmrc

@@ -1 +1 @@
-20.10.0
+v20.12.0

src/source-map.ts

@@ -3,23 +3,19 @@ import type { Transformed } from './utils/transform/apply-transformers.js';
 const inlineSourceMapPrefix = '\n//# sourceMappingURL=data:application/json;base64,';
 
 export const installSourceMapSupport = () => {
-	const hasNativeSourceMapSupport = (
-
-		/**
-		 * Check if native source maps are supported by seeing if the API is available
-		 * https://nodejs.org/dist/latest-v18.x/docs/api/process.html#processsetsourcemapsenabledval
-		 */
-		'setSourceMapsEnabled' in process
-
-		/**
-		 * Overriding Error.prepareStackTrace prevents --enable-source-maps from modifying
-		 * the stack trace
-		 * https://nodejs.org/dist/latest-v18.x/docs/api/cli.html#:~:text=Overriding%20Error.prepareStackTrace%20prevents%20%2D%2Denable%2Dsource%2Dmaps%20from%20modifying%20the%20stack%20trace.
-		 *
-		 * https://github.com/nodejs/node/blob/91193825551f9301b6ab52d96211b38889149892/lib/internal/errors.js#L141
-		 */
-		&& typeof Error.prepareStackTrace !== 'function'
-	);
+	/**
+	 * Check if native source maps are supported by seeing if the API is available
+	 * https://nodejs.org/dist/latest-v18.x/docs/api/process.html#processsetsourcemapsenabledval
+	 *
+	 * Previously, we also checked Error.prepareStackTrace to opt-out of source maps
+	 * as per this recommendation:
+	 * https://nodejs.org/dist/latest-v18.x/docs/api/cli.html#:~:text=Overriding%20Error.prepareStackTrace%20prevents%20%2D%2Denable%2Dsource%2Dmaps%20from%20modifying%20the%20stack%20trace.
+	 *
+	 * But it's been removed because:
+	 * 1. It's set by default from Node v21.6.0 and v20.12.0
+	 * 2. It may have been possible for a custom prepareStackTrace to parse the source maps
+	 */
+	const hasNativeSourceMapSupport = 'setSourceMapsEnabled' in process;
 
 	if (hasNativeSourceMapSupport) {
 		process.setSourceMapsEnabled(true);

tests/utils/node-versions.ts

@@ -13,8 +13,9 @@ export const nodeVersions = [
 			&& process.platform !== 'win32'
 		)
 			? [
-				'21.5.0',
-				latestMajor('20.10.0'),
+				latestMajor('21.7.2'),
+				'21.0.0',
+				latestMajor('20.12.0'),
 				'20.0.0',
 				latestMajor('18.20.0'),
 				'18.0.0',