export declare type MutableSet<A> = Set<A>
export declare type MutableArray<A> = Array<A>
export declare type MutableRecord<K extends string, T> = Record<K, T>
export declare type MutableMap<K, T> = Map<K, T>
export declare type Mutable<T> = {
  -readonly [P in keyof T]: T[P]
}
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