import { FeatureFlags, FormDefinition, WorkflowDefinition } from './types.js';
/**
 * Is a `flag` expression on (spec 01 §12)?
 * - no flag        -> always on
 * - 'name'         -> on only while flags.name is true
 * - '!name'        -> on only while flags.name is NOT true
 * A missing key counts as false — new features stay dark until the flags
 * file explicitly turns them on.
 */
export declare function flagEnabled(flag: string | undefined, flags: FeatureFlags): boolean;
/**
 * Resolve every `flag` in a definition against the current flag values:
 * flag-off fields/steps/rules come back REMOVED, as if never authored —
 * they don't render, don't validate, and never reach the payload. Run the
 * same call server-side (bank20baht-validator re-exports it) with the same
 * flags JSON so both sides agree. Returns the input untouched when nothing
 * in it carries a flag.
 */
export declare function applyFlags<T extends FormDefinition | WorkflowDefinition>(schema: T, flags?: FeatureFlags): T;