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backend/node_modules/postcss-minify-gradients/src/index.js

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+'use strict';
+const valueParser = require('postcss-value-parser');
+const { getArguments } = require('cssnano-utils');
+const isColorStop = require('./isColorStop.js');
+
+const angles = {
+  top: '0deg',
+  right: '90deg',
+  bottom: '180deg',
+  left: '270deg',
+};
+
+/**
+ * @param {valueParser.Dimension} a
+ * @param {valueParser.Dimension} b
+ * @return {boolean}
+ */
+function isLessThan(a, b) {
+  return (
+    a.unit.toLowerCase() === b.unit.toLowerCase() &&
+    parseFloat(a.number) >= parseFloat(b.number)
+  );
+}
+/**
+ * @param {import('postcss').Declaration} decl
+ * @return {void}
+ */
+function optimise(decl) {
+  const value = decl.value;
+
+  if (!value) {
+    return;
+  }
+
+  const normalizedValue = value.toLowerCase();
+
+  if (normalizedValue.includes('var(') || normalizedValue.includes('env(')) {
+    return;
+  }
+
+  if (!normalizedValue.includes('gradient')) {
+    return;
+  }
+
+  decl.value = valueParser(value)
+    .walk((node) => {
+      if (node.type !== 'function' || !node.nodes.length) {
+        return false;
+      }
+
+      const lowerCasedValue = node.value.toLowerCase();
+
+      if (
+        lowerCasedValue === 'linear-gradient' ||
+        lowerCasedValue === 'repeating-linear-gradient' ||
+        lowerCasedValue === '-webkit-linear-gradient' ||
+        lowerCasedValue === '-webkit-repeating-linear-gradient'
+      ) {
+        let args = getArguments(node);
+
+        if (
+          node.nodes[0].value.toLowerCase() === 'to' &&
+          args[0].length === 3
+        ) {
+          node.nodes = node.nodes.slice(2);
+          node.nodes[0].value =
+            angles[
+              /** @type {'top'|'right'|'bottom'|'left'}*/ (
+                node.nodes[0].value.toLowerCase()
+              )
+            ];
+        }
+
+        /** @type {valueParser.Dimension | false} */
+        let lastStop;
+
+        args.forEach((arg, index) => {
+          if (arg.length !== 3) {
+            return;
+          }
+
+          let isFinalStop = index === args.length - 1;
+          let thisStop = valueParser.unit(arg[2].value);
+
+          if (lastStop === undefined) {
+            lastStop = thisStop;
+
+            if (
+              !isFinalStop &&
+              lastStop &&
+              lastStop.number === '0' &&
+              lastStop.unit.toLowerCase() !== 'deg'
+            ) {
+              arg[1].value = arg[2].value = '';
+            }
+
+            return;
+          }
+
+          if (lastStop && thisStop && isLessThan(lastStop, thisStop)) {
+            arg[2].value = '0';
+          }
+
+          lastStop = thisStop;
+
+          if (isFinalStop && arg[2].value === '100%') {
+            arg[1].value = arg[2].value = '';
+          }
+        });
+
+        return false;
+      }
+
+      if (
+        lowerCasedValue === 'radial-gradient' ||
+        lowerCasedValue === 'repeating-radial-gradient'
+      ) {
+        let args = getArguments(node);
+        /** @type {valueParser.Dimension | false} */
+        let lastStop;
+
+        const hasAt = args[0].find((n) => n.value.toLowerCase() === 'at');
+
+        args.forEach((arg, index) => {
+          if (!arg[2] || (!index && hasAt)) {
+            return;
+          }
+
+          let thisStop = valueParser.unit(arg[2].value);
+
+          if (!lastStop) {
+            lastStop = thisStop;
+
+            return;
+          }
+
+          if (lastStop && thisStop && isLessThan(lastStop, thisStop)) {
+            arg[2].value = '0';
+          }
+
+          lastStop = thisStop;
+        });
+
+        return false;
+      }
+
+      if (
+        lowerCasedValue === '-webkit-radial-gradient' ||
+        lowerCasedValue === '-webkit-repeating-radial-gradient'
+      ) {
+        let args = getArguments(node);
+        /** @type {valueParser.Dimension | false} */
+        let lastStop;
+
+        args.forEach((arg) => {
+          let color;
+          let stop;
+
+          if (arg[2] !== undefined) {
+            if (arg[0].type === 'function') {
+              color = `${arg[0].value}(${valueParser.stringify(arg[0].nodes)})`;
+            } else {
+              color = arg[0].value;
+            }
+
+            if (arg[2].type === 'function') {
+              stop = `${arg[2].value}(${valueParser.stringify(arg[2].nodes)})`;
+            } else {
+              stop = arg[2].value;
+            }
+          } else {
+            if (arg[0].type === 'function') {
+              color = `${arg[0].value}(${valueParser.stringify(arg[0].nodes)})`;
+            }
+
+            color = arg[0].value;
+          }
+
+          color = color.toLowerCase();
+
+          const colorStop =
+            stop !== undefined
+              ? isColorStop(color, stop.toLowerCase())
+              : isColorStop(color);
+
+          if (!colorStop || !arg[2]) {
+            return;
+          }
+
+          let thisStop = valueParser.unit(arg[2].value);
+
+          if (!lastStop) {
+            lastStop = thisStop;
+
+            return;
+          }
+
+          if (lastStop && thisStop && isLessThan(lastStop, thisStop)) {
+            arg[2].value = '0';
+          }
+
+          lastStop = thisStop;
+        });
+
+        return false;
+      }
+    })
+    .toString();
+}
+/**
+ * @type {import('postcss').PluginCreator<void>}
+ * @return {import('postcss').Plugin}
+ */
+function pluginCreator() {
+  return {
+    postcssPlugin: 'postcss-minify-gradients',
+    OnceExit(css) {
+      css.walkDecls(optimise);
+    },
+  };
+}
+
+pluginCreator.postcss = true;
+module.exports = pluginCreator;

backend/node_modules/postcss-minify-gradients/src/isColorStop.js

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+'use strict';
+const { unit } = require('postcss-value-parser');
+const { colord, extend } = require('colord');
+const namesPlugin = require('colord/plugins/names');
+
+extend([/** @type {any} */ (namesPlugin)]);
+
+/* Code derived from https://github.com/pigcan/is-color-stop */
+
+const lengthUnits = new Set([
+  'PX',
+  'IN',
+  'CM',
+  'MM',
+  'EM',
+  'REM',
+  'POINTS',
+  'PC',
+  'EX',
+  'CH',
+  'VW',
+  'VH',
+  'VMIN',
+  'VMAX',
+  '%',
+]);
+
+/**
+ * @param {string} input
+ * @return {boolean}
+ */
+function isCSSLengthUnit(input) {
+  return lengthUnits.has(input.toUpperCase());
+}
+/**
+ * @param {string|undefined} str
+ * @return {boolean}
+ */
+function isStop(str) {
+  if (str) {
+    let stop = false;
+    const node = unit(str);
+    if (node) {
+      const number = Number(node.number);
+      if (number === 0 || (!isNaN(number) && isCSSLengthUnit(node.unit))) {
+        stop = true;
+      }
+    } else {
+      stop = /^calc\(\S+\)$/g.test(str);
+    }
+    return stop;
+  }
+  return true;
+}
+/**
+ * @param {string} color
+ * @param {string} [stop]
+ * @return {boolean}
+ */
+module.exports = function isColorStop(color, stop) {
+  return colord(color).isValid() && isStop(stop);
+};