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website/node_modules/@mui/system/memoTheme.mjs

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+import preprocessStyles from "./preprocessStyles.mjs";
+
+/* eslint-disable @typescript-eslint/naming-convention */
+
+// We need to pass an argument as `{ theme }` for PigmentCSS, but we don't want to
+// allocate more objects.
+const arg = {
+  theme: undefined
+};
+
+/**
+ * Memoize style function on theme.
+ * Intended to be used in styled() calls that only need access to the theme.
+ */
+export default function unstable_memoTheme(styleFn) {
+  let lastValue;
+  let lastTheme;
+  return function styleMemoized(props) {
+    let value = lastValue;
+    if (value === undefined || props.theme !== lastTheme) {
+      arg.theme = props.theme;
+      value = preprocessStyles(styleFn(arg));
+      lastValue = value;
+      lastTheme = props.theme;
+    }
+    return value;
+  };
+}