/**
 * The rollout inspector.
 *
 * A flag system whose state can only be learned by reading the source is a flag
 * system nobody can debug. These lines answer the three questions a user actually
 * has -- which channel am I on, what is on right now, and WHY is this one on -- and
 * one more that matters most when something is wrong: what did you ignore?
 *
 * A refused input is printed even though it changed nothing, because changing
 * nothing is the whole problem. A user who set TOKEN_OPTIMIZER_FEATURES=substitue
 * has a typo, an experiment that is not running, and no other way to find out.
 */
import { RolloutChannel } from './channel.js';
import { FeatureDecision, RolloutSnapshot } from './resolve.js';
/** Why this one is the way it is, in words, naming the switch that decided. */
export declare function explainDecision(decision: FeatureDecision): string;
/**
 * The block the doctor prints.
 *
 * Only the enabled features are listed in full. A user on stable has nine things
 * off for the same uninteresting reason, and printing all eleven every time buries
 * the two that are on -- so the rest are counted, and the reader can widen the
 * question if they want them.
 */
export declare function describeRollout(snapshot: RolloutSnapshot): string[];
/** Every feature and its state, for the case where the summary is not enough. */
export declare function describeEveryFeature(snapshot: RolloutSnapshot): string[];
/** The doctor's section, headed and indented like the others. */
export declare function rolloutSection(env?: NodeJS.ProcessEnv, options?: {
    readonly verbose?: boolean;
}): string[];
/** Named so a caller can print the variable rather than hard-coding it twice. */
export declare function channelVariable(): string;
export declare function widestChannel(): RolloutChannel;
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