From c60204a6c35df9875ff347ae09ddb399498bbbcf Mon Sep 17 00:00:00 2001
From: Dmitry Sharabin <dmitrysharabin@gmail.com>
Date: Tue, 2 Jun 2026 22:57:34 +0200
Subject: [PATCH 1/2] Fix CJS build to actually emit CommonJS
MIME-Version: 1.0
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The CJS bundle was identical to the ESM bundle because the Rollup config
did not specify `format: 'cjs'`. This caused `require("prismjs")` to
throw a SyntaxError on Node 18–21, and return an unexpected ESM namespace
object on Node 22+.

- Add `format: 'cjs'` to the CJS output options
- Add `format: 'es'` to the ESM output options for clarity
- Write `dist/cjs/package.json` with `{"type":"commonjs"}` so Node
  parses the CJS files correctly despite the root `"type": "module"`

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 scripts/build.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/scripts/build.js b/scripts/build.js
index 0dc11ce06b..b228a710f8 100644
--- a/scripts/build.js
+++ b/scripts/build.js
@@ -411,7 +411,10 @@ async function buildJS () {
 	const bundles = {
 		esm: {
 			rollupOptions: defaultRollupOptions,
-			outputOptions: defaultOutputOptions,
+			outputOptions: {
+				...defaultOutputOptions,
+				format: 'es',
+			},
 		},
 		cjs: {
 			rollupOptions: {
@@ -421,6 +424,7 @@ async function buildJS () {
 			outputOptions: {
 				...defaultOutputOptions,
 				dir: './dist/cjs',
+				format: 'cjs',
 			},
 		},
 	};
@@ -430,6 +434,14 @@ async function buildJS () {
 			bundle.build = await rollup(bundle.rollupOptions);
 			await bundle.build.write(bundle.outputOptions);
 		}
+		// The root package.json has "type": "module", so Node treats all .js files as ESM.
+		// This overrides that for the CJS directory, since Node uses the nearest parent
+		// package.json to determine the module system: https://nodejs.org/api/packages.html#type
+		await writeFile(
+			path.join(DIST_DIR, 'cjs', 'package.json'),
+			JSON.stringify({ type: 'commonjs' }),
+			'utf-8'
+		);
 	}
 	finally {
 		for (const bundle of Object.values(bundles)) {

From 033ac248110fbf4c760621018b48d40135da50a1 Mon Sep 17 00:00:00 2001
From: Dmitry Sharabin <dmitrysharabin@gmail.com>
Date: Tue, 2 Jun 2026 23:23:54 +0200
Subject: [PATCH 2/2] Make CJS exports idiomatic so require() works without
 .default

Add a Rollup plugin that appends a one-liner to CJS chunks with mixed
default + named exports, making module.exports the default with named
exports as properties (the Axios pattern). Without this, CJS consumers
would need require("prismjs").default.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 scripts/build.js | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/scripts/build.js b/scripts/build.js
index b228a710f8..873706f2ed 100644
--- a/scripts/build.js
+++ b/scripts/build.js
@@ -304,6 +304,25 @@ const lazyGrammarPlugin = {
 	},
 };
 
+/**
+ * Makes `require("prismjs")` return the default export directly with named
+ * exports as properties, so CJS consumers don't need `.default`.
+ *
+ * @type {Plugin}
+ */
+const cjsExportPlugin = {
+	name: 'cjs-default-export',
+	renderChunk (code) {
+		if (!code.includes('exports.default=')) {
+			return null;
+		}
+
+		code += 'module.exports=Object.assign(exports.default,exports);';
+
+		return { code, map: null };
+	},
+};
+
 /**
  * @param {MagicString} s
  * @returns {{ code: string; map: SourceMapInput }}
@@ -419,7 +438,7 @@ async function buildJS () {
 		cjs: {
 			rollupOptions: {
 				...defaultRollupOptions,
-				plugins: [...defaultRollupOptions.plugins, commonjs()],
+				plugins: [...defaultRollupOptions.plugins, commonjs(), cjsExportPlugin],
 			},
 			outputOptions: {
 				...defaultOutputOptions,