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removeUnusedAtRules exception #1252

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andrewgoz opened this issue May 24, 2023 · 0 comments

andrewgoz commented May 24, 2023

I'm using html-minifier-terser 7.2.0 which includes clean-css 5.3 with node 18.12.0 on Windows 10. When I attempt to minify:

<!doctype html>
<html><head><title>Test</title>
<style>
@keyframes test {
   0% {rotate:  0deg;}
 100% {rotate:360deg;}
}
:root {
  --test-anim: 1s test;
}
p:hover {
  animation: var(--test-anim);
}
</style>
<body><p style="position:absolute">Hover me!</p></body>
</html>

I get the message:

clean-css\lib\optimizer\level-2\remove-unused-at-rules.js:194
        for (j = 0, m = component.value.length; j < m; j++) {
                                  ^
TypeError: Cannot read properties of undefined (reading 'value')

and no output file is produced.

For my configuration I have level 2 "all" set to true. If I add "removeUnusedAtRules:false" the problem goes away.

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