feat: support _cacheGroup

Author: pi0

src/lib/setupContext.js

@@ -25,6 +25,7 @@ const { isBuffer } = require('util')
 let contextMap = sharedState.contextMap
 let configContextMap = sharedState.configContextMap
 let contextSourcesMap = sharedState.contextSourcesMap
+let configHashMap = sharedState.configHashMap
 let env = sharedState.env
 
 // Earmarks a directory for our touch files.
@@ -629,6 +630,8 @@ function setupContext(configOrPath) {
     let [tailwindConfig, userConfigPath, tailwindConfigHash] = getTailwindConfig(configOrPath)
     let isConfigFile = userConfigPath !== null
 
+    const { _cacheGroup = 'default', _hash } = tailwindConfig
+
     let contextDependencies = new Set()
 
     // If there are no @tailwind rules, we don't consider this CSS file or it's dependencies
@@ -656,8 +659,13 @@ function setupContext(configOrPath) {
     if (!contextDependenciesChanged) {
       // If this file already has a context in the cache and we don't need to
       // reset the context, return the cached context.
-      if (isConfigFile && contextMap.has(sourcePath)) {
-        return contextMap.get(sourcePath)
+      if (contextMap.has(sourcePath)) {
+        if (
+          isConfigFile ||
+          (_hash && configHashMap.has(_cacheGroup) && _hash === configHashMap.get(_cacheGroup))
+        ) {
+          return contextMap.get(sourcePath)
+        }
       }
 
       // If the config used already exists in the cache, return that.
@@ -669,6 +677,10 @@ function setupContext(configOrPath) {
       }
     }
 
+    if (_hash) {
+      configHashMap.set(_cacheGroup, _hash)
+    }
+
     // If this source is in the context map, get the old context.
     // Remove this source from the context sources for the old context,
     // and clean up that context if no one else is using it. This can be

src/lib/sharedState.js

@@ -9,5 +9,6 @@ module.exports = {
   contextMap: new Map(),
   configContextMap: new Map(),
   contextSourcesMap: new Map(),
+  configHashMap: new Map(),
   contentMatchCache: new LRU({ maxSize: 25000 }),
 }