Adds config entry for custom dark mode selectors (#45)

* fixes #44

* catch a bug

Author: Adam Argyle

index.js

@@ -30,7 +30,13 @@ const getAdaptivePropSelector = (selector) => {
 
 /** @type { import('postcss').PluginCreator<any> }*/
 module.exports = (options) => {
-  const { files, adaptive_prop_selector, custom_selector, layer, ...props } = options
+  const { 
+    files, 
+    adaptive_prop_selector, 
+    custom_selector, 
+    custom_selector_dark, 
+    layer, ...props
+  } = options
 
   const FilePropsCache = new Map();
 
@@ -55,6 +61,7 @@ module.exports = (options) => {
       return {
         Once(node, { parse, result, Rule, AtRule }) {
           let target_selector = custom_selector || ':root'
+          let target_selector_dark = custom_selector_dark || custom_selector || ':root'
 
           if (!files && !Object.keys(props).length) {
             return console.warn('postcss-jit-props: Variable source(s) not passed.')
@@ -121,7 +128,7 @@ module.exports = (options) => {
           STATE.mapped_dark = new Set()
 
           STATE.target_rule = new Rule({ selector: target_selector, source: node.first.source })
-          STATE.target_rule_dark = new Rule({ selector: target_selector, source: node.first.source })
+          STATE.target_rule_dark = new Rule({ selector: target_selector_dark, source: node.first.source })
           STATE.target_media_dark = new AtRule({ name: 'media', params: '(prefers-color-scheme: dark)', source: node.first.source })
 
           if (layer) {

index.test.js

@@ -413,6 +413,53 @@ a {
   )
 })
 
+it('Can jit light and dark props to a custom selector', async () => {
+  await run(
+`a {
+  color: var(--text);
+}`, 
+`:global {
+  --text: white;
+}
+a {
+  color: var(--text);
+}
+@media (prefers-color-scheme: dark) {
+  :global {
+    --text: black;
+  }
+}`, 
+  {
+    ... MockProps,
+    custom_selector: ':global',
+  }
+  )
+})
+
+it('Can jit light & dark props to a custom selector for use with a client side switch', async () => {
+  await run(
+`a {
+  color: var(--text);
+}`, 
+`.light {
+  --text: white;
+}
+a {
+  color: var(--text);
+}
+@media (prefers-color-scheme: dark) {
+  .dark {
+    --text: black;
+  }
+}`, 
+  {
+    ... MockProps,
+    custom_selector: '.light',
+    custom_selector_dark: '.dark',
+  }
+  )
+})
+
 it('Wont create a :root {} context unless props are found', async () => {
   await run(
 `a {