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immer

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Create your next immutable state by mutating the current one

github.com/immerjs/immer

immerjs/immer

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// Should be no imports here! /** * The sentinel value returned by producers to replace the draft with undefined. */ export const NOTHING: unique symbol = Symbol.for("immer-nothing") /** * To let Immer treat your class instances as plain immutable objects * (albeit with a custom prototype), you must define either an instance property * or a static property on each of your custom classes. * * Otherwise, your class instance will never be drafted, which means it won't be * safe to mutate in a produce callback. */ export const DRAFTABLE: unique symbol = Symbol.for("immer-draftable") export const DRAFT_STATE: unique symbol = Symbol.for("immer-state")