paradiego

node_modules/@mui/material/modern/utils/memoTheme.js

@@ -0,0 +1,24 @@
+// 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 memoTheme(styleFn) {
+  let lastValue;
+  let lastTheme;
+  return props => {
+    let value = lastValue;
+    if (value === undefined || props.theme !== lastTheme) {
+      arg.theme = props.theme;
+      value = styleFn(arg);
+      lastValue = value;
+      lastTheme = props.theme;
+    }
+    return value;
+  };
+}