/** Base storage contract for reading, writing, and observing app settings. */
export declare class AppSettingsStorageBase {
    private defaults;
    private prefix;
    /** Initializes the storage adapter with its setting schema and defaults. */
    constructor(prefix?: string, defaults?: Record<string, unknown>);
    /** Returns boolean from the current app-settings state. */
    getBoolean(name: string): boolean;
    /** Returns number from the current app-settings state. */
    getNumber(name: string): number;
    /** Returns object from the current app-settings state. */
    getObject<T>(name: string): T;
    /** Returns string from the current app-settings state. */
    getString(name: string): string;
    /** Returns string array from the current app-settings state. */
    getStringArray(name: string): string[];
    /** Updates boolean in the current app-settings state. */
    setBoolean(name: string, value: boolean): void;
    /** Updates number in the current app-settings state. */
    setNumber(name: string, value: number): void;
    /** Updates object in the current app-settings state. */
    setObject<T>(name: string, value: T): void;
    /** Updates string in the current app-settings state. */
    setString(name: string, value: string): void;
    /** Updates string array in the current app-settings state. */
    setStringArray(name: string, value: string[]): void;
}
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