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Add a comment to explain performance optimization

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This commit is contained in:
Adam Wathan 2019-01-11 13:07:20 -05:00
parent 5ade923fa4
commit f01d79f76b
1 changed files with 9 additions and 0 deletions
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src/processTailwindFeatures.js
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@ -23,6 +23,15 @@ export default function(getConfig) {
substituteResponsiveAtRules(config),
substituteScreenAtRules(config),
substituteClassApplyAtRules(config, processedPlugins.utilities),
// This quick plugin is necessary to avoid a serious performance
// hit due to nodes created by postcss-js having an empty `raws`
// value, and PostCSS not providing a default `raws.semicolon`
// value. This turns determining what value to use there into an
// O(n) operation instead of an O(1) operation.
//
// The latest version of PostCSS 7.x has this patched internally,
// but patching from userland until we upgrade from v6 to v7.
function(root) {
root.rawCache = {
colon: ': ',