import { Box } from "@opendaw/lib-box";
import { Pointers } from "@opendaw/studio-enums";
import { JSONValue, Nullable, Observer, Option, Terminable } from "@opendaw/lib-std";
export declare namespace MetaData {
    /**
     * Stores the given JSONValue in the target box under the given origin.
     * Needs to be called within a transaction.
     * @param target The box to store the meta-data in.
     * @param value The value to store. Must be JSON-serializable.
     * @param origin The origin of the meta-data. Must be unique to the app.
     */
    const store: (target: Box<Pointers.MetaData | Pointers>, value: JSONValue, origin: string) => void;
    /**
     * Reads the meta-data from the target box.
     * Returns a failed Attempt if no meta-data is found or the value is not deserializable.
     * @param target The box to read the meta-data from.
     * @param origin The origin of the meta-data. Should be unique to the app.
     */
    const read: (target: Box<Pointers.MetaData | Pointers>, origin: string) => Nullable<JSONValue>;
    /**
     * Deletes all meta-data from the target box with the given origin.
     * Needs to be called within a transaction.
     * @param target The box to delete the meta-data from.
     * @param origin The origin of the meta-data. Must be unique to the app.
     */
    const clear: (target: Box<Pointers.MetaData | Pointers>, origin: string) => void;
    /**
     * Subscribes to meta-data changes on the target box for the given origin.
     * Catches up with existing meta-data and subscribes to future additions/removals.
     * The observer receives the parsed JSONValue or null when cleared.
     * @param target The box to observe meta-data on.
     * @param origin The origin of the meta-data. Must be unique to the app.
     * @param observer Called with the current value whenever it changes, or null when removed.
     */
    const catchupAndSubscribe: (target: Box<Pointers.MetaData | Pointers>, origin: string, observer: Observer<Option<JSONValue>>) => Terminable;
}
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