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mobx-keystone-mindreframer

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A MobX powered state management solution based on data trees with first class support for Typescript, snapshots, patches and much more

mobx-keystone.js.org

xaviergonz/mobx-keystone

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export declare function getOrCreate<K, V>(map: Map<K, V>, key: K, create: () => V): V; export declare function getOrCreate<K extends object, V>(map: WeakMap<K, V>, key: K, create: () => V): V;