ExtractMutatorKeys type

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type ExtractMutatorKeys<
    TContext extends ServerMutatorContext,
    Mutators extends ServerMutatorDefs<TContext>
> = {
    readonly [K in keyof Mutators]: Mutators[K] extends ServerMutatorImpl<TContext>
        ? K & string
        : keyof Mutators[K] extends string
          ? `${K & string}|${keyof Mutators[K] & string}`
          : never;
}[keyof Mutators];