pre-installations and preparations

node_modules/@mui/utils/composeClasses/composeClasses.d.ts

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+export default function composeClasses<ClassKey extends string>(slots: Record<ClassKey, ReadonlyArray<string | false | undefined | null>>, getUtilityClass: (slot: string) => string, classes?: Record<string, string> | undefined): Record<ClassKey, string>;

node_modules/@mui/utils/composeClasses/composeClasses.js

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+export default function composeClasses(slots, getUtilityClass, classes = undefined) {
+  const output = {};
+  Object.keys(slots).forEach(
+  // `Object.keys(slots)` can't be wider than `T` because we infer `T` from `slots`.
+  // @ts-expect-error https://github.com/microsoft/TypeScript/pull/12253#issuecomment-263132208
+  slot => {
+    output[slot] = slots[slot].reduce((acc, key) => {
+      if (key) {
+        const utilityClass = getUtilityClass(key);
+        if (utilityClass !== '') {
+          acc.push(utilityClass);
+        }
+        if (classes && classes[key]) {
+          acc.push(classes[key]);
+        }
+      }
+      return acc;
+    }, []).join(' ');
+  });
+  return output;
+}

node_modules/@mui/utils/composeClasses/index.d.ts

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+export { default } from './composeClasses';

node_modules/@mui/utils/composeClasses/index.js

@@ -0,0 +1 @@
+export { default } from './composeClasses';

node_modules/@mui/utils/composeClasses/package.json

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+{
+  "sideEffects": false,
+  "module": "./index.js",
+  "main": "../node/composeClasses/index.js",
+  "types": "./index.d.ts"
+}