export type ConditionPredicate = () => boolean;
export interface ConditionOptions {
    timeout?: Promise<any>;
}
/**
 * A condition which will resolve when the predicate resolves to true.
 *
 * The contents of the condition should be deterministic and contain no task calls.
 * Should only be called from within a workflow.
 *
 * ```ts
 * workflow("myWorkflow", async () => {
 *    let n = 0;
 *    onSignal("mySignal", () => { n++ });
 *
 *    await condition(() => n === 5); // after 5 mySignals, this promise will be resolved.
 *
 *    return "got 5!"
 * });
 * ```
 *
 * Supports a timeout to avoid running forever. When the condition times out, it returns false.
 *
 * ```ts
 * workflow("myWorkflow", async () => {
 *    let n = 0;
 *    onSignal("mySignal", () => { n++ });
 *
 *    // after 5 mySignals, this promise will be resolved.
 *    if(!(await condition({ timeout: duration(5, "minutes") }, () => n === 5))) {
 *       return "did not get 5 in 5 minutes."
 *    }
 *
 *    return "got 5!"
 * });
 * ```
 */
export declare function condition(predicate: ConditionPredicate): Promise<boolean>;
export declare function condition(opts: ConditionOptions, predicate: ConditionPredicate): Promise<boolean>;
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