@microsoft/teams.apps/dist/state/options.d.ts

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import type { IStorage } from '@microsoft/teams.common';
/** Configures per-turn conversation and user state. */
export type StateOptions = {
    /**
     * Storage used for persisted state JSON strings.
     *
     * Providers may encode the strings to UTF-8 or another native representation.
     * Defaults to dedicated process-local storage.
     */
    readonly storage?: IStorage<string, string>;
    /**
     * Prefix applied to conversation and user storage keys.
     * @default 'ts'
     */
    readonly keyPrefix?: string;
};