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backend/node_modules/postcss-normalize-repeat-style/src/index.js

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+'use strict';
+const valueParser = require('postcss-value-parser');
+const mappings = require('./lib/map');
+
+/**
+ * @param {unknown} item
+ * @param {number} index
+ * @return {boolean}
+ */
+function evenValues(item, index) {
+  return index % 2 === 0;
+}
+
+const repeatKeywords = new Set(mappings.values());
+
+/**
+ * @param {valueParser.Node} node
+ * @return {boolean}
+ */
+function isCommaNode(node) {
+  return node.type === 'div' && node.value === ',';
+}
+
+const variableFunctions = new Set(['var', 'env', 'constant']);
+/**
+ * @param {valueParser.Node} node
+ * @return {boolean}
+ */
+function isVariableFunctionNode(node) {
+  if (node.type !== 'function') {
+    return false;
+  }
+
+  return variableFunctions.has(node.value.toLowerCase());
+}
+
+/**
+ * @param {string} value
+ * @return {string}
+ */
+function transform(value) {
+  const parsed = valueParser(value);
+
+  if (parsed.nodes.length === 1) {
+    return value;
+  }
+  /** @type {{start: number?, end: number?}[]} */
+  const ranges = [];
+  let rangeIndex = 0;
+  let shouldContinue = true;
+
+  parsed.nodes.forEach((node, index) => {
+    // After comma (`,`) follows next background
+    if (isCommaNode(node)) {
+      rangeIndex += 1;
+      shouldContinue = true;
+
+      return;
+    }
+
+    if (!shouldContinue) {
+      return;
+    }
+
+    // After separator (`/`) follows `background-size` values
+    // Avoid them
+    if (node.type === 'div' && node.value === '/') {
+      shouldContinue = false;
+
+      return;
+    }
+
+    if (!ranges[rangeIndex]) {
+      ranges[rangeIndex] = {
+        start: null,
+        end: null,
+      };
+    }
+
+    // Do not try to be processed `var and `env` function inside background
+    if (isVariableFunctionNode(node)) {
+      shouldContinue = false;
+      ranges[rangeIndex].start = null;
+      ranges[rangeIndex].end = null;
+
+      return;
+    }
+
+    const isRepeatKeyword =
+      node.type === 'word' && repeatKeywords.has(node.value.toLowerCase());
+
+    if (ranges[rangeIndex].start === null && isRepeatKeyword) {
+      ranges[rangeIndex].start = index;
+      ranges[rangeIndex].end = index;
+
+      return;
+    }
+
+    if (ranges[rangeIndex].start !== null) {
+      if (node.type === 'space') {
+        return;
+      } else if (isRepeatKeyword) {
+        ranges[rangeIndex].end = index;
+
+        return;
+      }
+
+      return;
+    }
+  });
+
+  ranges.forEach((range) => {
+    if (range.start === null) {
+      return;
+    }
+
+    const nodes = parsed.nodes.slice(
+      range.start,
+      /** @type {number} */ (range.end) + 1
+    );
+
+    if (nodes.length !== 3) {
+      return;
+    }
+    const key = nodes
+      .filter(evenValues)
+      .map((n) => n.value.toLowerCase())
+      .toString();
+
+    const match = mappings.get(key);
+
+    if (match) {
+      nodes[0].value = match;
+      nodes[1].value = nodes[2].value = '';
+    }
+  });
+
+  return parsed.toString();
+}
+
+/**
+ * @type {import('postcss').PluginCreator<void>}
+ * @return {import('postcss').Plugin}
+ */
+function pluginCreator() {
+  return {
+    postcssPlugin: 'postcss-normalize-repeat-style',
+    prepare() {
+      const cache = new Map();
+      return {
+        OnceExit(css) {
+          css.walkDecls(
+            /^(background(-repeat)?|(-\w+-)?mask-repeat)$/i,
+            (decl) => {
+              const value = decl.value;
+
+              if (!value) {
+                return;
+              }
+
+              if (cache.has(value)) {
+                decl.value = cache.get(value);
+
+                return;
+              }
+
+              const result = transform(value);
+
+              decl.value = result;
+              cache.set(value, result);
+            }
+          );
+        },
+      };
+    },
+  };
+}
+
+pluginCreator.postcss = true;
+module.exports = pluginCreator;

backend/node_modules/postcss-normalize-repeat-style/src/lib/map.js

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+'use strict';
+module.exports = new Map([
+  [['repeat', 'no-repeat'].toString(), 'repeat-x'],
+  [['no-repeat', 'repeat'].toString(), 'repeat-y'],
+  [['repeat', 'repeat'].toString(), 'repeat'],
+  [['space', 'space'].toString(), 'space'],
+  [['round', 'round'].toString(), 'round'],
+  [['no-repeat', 'no-repeat'].toString(), 'no-repeat'],
+]);