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frontend/node_modules/@ant-design/cssinjs/es/theme/createTheme.js

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+import ThemeCache from "./ThemeCache";
+import Theme from "./Theme";
+var cacheThemes = new ThemeCache();
+
+/**
+ * Same as new Theme, but will always return same one if `derivative` not changed.
+ */
+export default function createTheme(derivatives) {
+  var derivativeArr = Array.isArray(derivatives) ? derivatives : [derivatives];
+  // Create new theme if not exist
+  if (!cacheThemes.has(derivativeArr)) {
+    cacheThemes.set(derivativeArr, new Theme(derivativeArr));
+  }
+
+  // Get theme from cache and return
+  return cacheThemes.get(derivativeArr);
+}