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Date: Wed, 19 Aug 2026 16:13:31 +0000
Message-Id: <DKT1XLR7D0A0.1KDDOCDFZVGDP@debian.org>
Subject: highlight.js: Rollup change breaks hljs.registerLanguage calls
From: "Blair Noctis" <ncts@debian.org>
To: <submit@bugs.debian.org>
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Source: highlight.js
Version: 10.7.3+dfsg-1
Severity: grave
Justification: renders package unusable
Tags: patch
X-Debbugs-Cc: debian-js@lists.debian.org, ncts@debian.org

Dear Maintainer,

Due to a breaking change in behavior from Rollup 2 to 3, IIFE regex replace=
ment
for `hljs.registerLanguage` calls breaks.

Rollup 2, which this version of hljs targeted, generates this:

var dummyName =3D (function () { /* ... */ }());

which is replaced by hljs to:

hljs.registerLanguage('${language.name}', function () { /* ... */ }());

while Rollup 3 generates this:

var dummyName =3D (function () { /* ... */ })();

which is replaced by hljs to:

hljs.registerLanguage('${language.name}', function () { /* ... */ })();

You can see that while the previous replacement calls the function *inside*=
,
current replacement calls the "result" of the `hljs.registerLanguage` call.

The following patch fixes it by calling `hljs.registerLanguage` in a separa=
te
statement.

Note, it's intended to be in the debian/patches series, not a debdiff.

--- a/tools/lib/language.js
+++ b/tools/lib/language.js
@@ -86,14 +86,14 @@

 async function compileLanguage (language, options) {
   const EXPORT_REGEX =3D /export default (.*);/;
-  const IIFE_HEADER_REGEX =3D /^(var dummyName =3D )?\(function \(\)/;
+  //const IIFE_HEADER_REGEX =3D /^(var dummyName =3D )?\(function \(\)/;
=20
   // TODO: cant we use the source we already have?
   const input =3D { ...build_config.rollup.browser.input, input: language.=
path };
   const output =3D { ...build_config.rollup.browser.output,  name: `dummyN=
ame`, file: "out.js" };
   var data =3D await rollupCode(input, output)
=20
-  data =3D data.replace(IIFE_HEADER_REGEX, `hljs.registerLanguage('${langu=
age.name}', function ()`)
+  data =3D `(function() {\n${data}\nhljs.registerLanguage('${language.name=
}', dummyName);\n})();` //data =3D data.replace(IIFE_HEADER_REGEX, `hljs.re=
gisterLanguage('${language.name}', function ()`)
=20
   var original =3D data;
   language.module =3D data;

--=20
    ,Sdrager
Blair Noctis

=F0=9F=87=B5=F0=9F=87=B8

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