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node_modules/next/dist/shared/lib/deep-readonly.d.ts

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+/**
+ * A type that represents a deeply readonly object. This is similar to
+ * TypeScript's `Readonly` type, but it recursively applies the `readonly`
+ * modifier to all properties of an object and all elements of arrays.
+ */
+export type DeepReadonly<T> = T extends (infer R)[] ? ReadonlyArray<DeepReadonly<R>> : T extends object ? {
+    readonly [K in keyof T]: DeepReadonly<T[K]>;
+} : T;