postcss,(plugins): nanocss, postcss-preset-env

1 files changed, 167 insertions, 0 deletions

diff --git a/node_modules/postcss-discard-duplicates/src/index.js b/node_modules/postcss-discard-duplicates/src/index.js
new file mode 100644
index 00000000..28ca2ca5
--- /dev/null
+++ b/node_modules/postcss-discard-duplicates/src/index.js
@@ -0,0 +1,167 @@
+'use strict';
+/**
+ * @param {string | undefined} value
+ * @return {string | undefined}
+ */
+function trimValue(value) {
+  return value ? value.trim() : value;
+}
+
+/**
+ * @param {{nodes: import('postcss').Node[]}} node
+ * @return {boolean}
+ */
+function empty(node) {
+  return !node.nodes.filter((child) => child.type !== 'comment').length;
+}
+
+/**
+ * @param {import('postcss').AnyNode} nodeA
+ * @param {import('postcss').AnyNode} nodeB
+ * @return {boolean}
+ */
+function equals(nodeA, nodeB) {
+  const a = /** @type {any} */ (nodeA);
+  const b = /** @type {any} */ (nodeB);
+  if (a.type !== b.type) {
+    return false;
+  }
+
+  if (a.important !== b.important) {
+    return false;
+  }
+
+  if ((a.raws && !b.raws) || (!a.raws && b.raws)) {
+    return false;
+  }
+
+  switch (a.type) {
+    case 'rule':
+      if (a.selector !== b.selector) {
+        return false;
+      }
+      break;
+    case 'atrule':
+      if (a.name !== b.name || a.params !== b.params) {
+        return false;
+      }
+
+      if (a.raws && trimValue(a.raws.before) !== trimValue(b.raws.before)) {
+        return false;
+      }
+
+      if (
+        a.raws &&
+        trimValue(a.raws.afterName) !== trimValue(b.raws.afterName)
+      ) {
+        return false;
+      }
+      break;
+    case 'decl':
+      if (a.prop !== b.prop || a.value !== b.value) {
+        return false;
+      }
+
+      if (a.raws && trimValue(a.raws.before) !== trimValue(b.raws.before)) {
+        return false;
+      }
+      break;
+  }
+
+  if (a.nodes) {
+    if (a.nodes.length !== b.nodes.length) {
+      return false;
+    }
+
+    for (let i = 0; i < a.nodes.length; i++) {
+      if (!equals(a.nodes[i], b.nodes[i])) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+/**
+ * @param {import('postcss').Rule} last
+ * @param {import('postcss').AnyNode[]} nodes
+ * @return {void}
+ */
+function dedupeRule(last, nodes) {
+  let index = nodes.indexOf(last) - 1;
+  while (index >= 0) {
+    const node = nodes[index--];
+    if (node && node.type === 'rule' && node.selector === last.selector) {
+      last.each((child) => {
+        if (child.type === 'decl') {
+          dedupeNode(child, node.nodes);
+        }
+      });
+
+      if (empty(node)) {
+        node.remove();
+      }
+    }
+  }
+}
+
+/**
+ * @param {import('postcss').AtRule | import('postcss').Declaration} last
+ * @param {import('postcss').AnyNode[]} nodes
+ * @return {void}
+ */
+function dedupeNode(last, nodes) {
+  let index = nodes.includes(last) ? nodes.indexOf(last) - 1 : nodes.length - 1;
+
+  while (index >= 0) {
+    const node = nodes[index--];
+    if (node && equals(node, last)) {
+      node.remove();
+    }
+  }
+}
+
+/**
+ * @param {import('postcss').AnyNode} root
+ * @return {void}
+ */
+function dedupe(root) {
+  const { nodes } =
+    /** @type {import('postcss').Container<import('postcss').ChildNode>} */ (
+      root
+    );
+
+  if (!nodes) {
+    return;
+  }
+
+  let index = nodes.length - 1;
+  while (index >= 0) {
+    let last = nodes[index--];
+    if (!last || !last.parent) {
+      continue;
+    }
+    dedupe(last);
+    if (last.type === 'rule') {
+      dedupeRule(last, nodes);
+    } else if (last.type === 'atrule' || last.type === 'decl') {
+      dedupeNode(last, nodes);
+    }
+  }
+}
+
+/**
+ * @type {import('postcss').PluginCreator<void>}
+ * @return {import('postcss').Plugin}
+ */
+function pluginCreator() {
+  return {
+    postcssPlugin: 'postcss-discard-duplicates',
+    OnceExit(css) {
+      dedupe(css);
+    },
+  };
+}
+
+pluginCreator.postcss = true;
+module.exports = pluginCreator;