/**
 * Per-collection write gate. Holds the (async) update decision
 * computed at registration; `Collection.put`/`delete` await it before
 * writing and throw the strategy's rejection error.
 *
 * Detection FAILURE (the promise rejecting) is deliberately NOT a write
 * block — schema detection is a fingerprint safety net, not a correctness
 * invariant (matches how persisted-schema write failures are swallowed).
 * Only an explicit `reject` decision blocks writes.
 */
import type { UpdateDecision } from './types.js';
export declare class SchemaUpdateGate {
    #private;
    constructor(decision: Promise<UpdateDecision>);
    assertWritable(): Promise<void>;
}