Fix race condition issue of postcss-custom-properties #332
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This PR fixed #331 . For more background please see that issue.
As I understand the
prepare
function is designed to store context variables for each CSS file, while the plugin function itself should contain some common code across CSS files, like some constant variables only related toopts
.In this case the
customProperties
is mutated and read between listeners. So it should be placed inprepare
rather tha plugin function.Ref: https://github.com/postcss/postcss/blob/main/docs/writing-a-plugin.md#step-3-find-nodes