type DeepValue<TValue, TAccessor, TNullable>: unknown extends TValue ? TValue : TValue extends ReadonlyArray<any> ? TAccessor extends `[${infer TBrackets}].${infer TAfter}` ? DeepValue<DeepValue<TValue, TBrackets>, TAfter> : TAccessor extends `[${infer TBrackets}]` ? DeepValue<TValue, TBrackets> : TAccessor extends keyof TValue ? TValue[TAccessor] : TValue[TAccessor & number] : TValue extends Record<string | number, any> ? TAccessor extends `${infer TBefore}[${infer TEverythingElse}` ? DeepValue<DeepValue<TValue, TBefore>, `[${TEverythingElse}`> : TAccessor extends `[${infer TBrackets}]` ? DeepValue<TValue, TBrackets> : TAccessor extends `${infer TBefore}.${infer TAfter}` ? DeepValue<DeepValue<TValue, TBefore>, TAfter> : TAccessor extends string ? TNullable extends true ? Nullable<TValue[TAccessor]> : TValue[TAccessor] : never : never;