/**
 * Runtime rollout channels.
 *
 * A channel controls what an already-installed copy DOES. It selects no package
 * and no version: a user on `beta` is running the same bytes as a user on
 * `stable` and taking a different set of behaviours out of them. That separation
 * is the whole point -- an experiment can be turned on for the people who want it
 * without shipping them a different build to roll back from.
 *
 * The channels are ORDERED, and a wider channel takes everything the narrower one
 * has. Without that, "available in beta" and "available in canary" would be two
 * unrelated sets and a canary user would silently lose a beta feature.
 */
export declare enum RolloutChannel {
    Stable = "stable",
    Beta = "beta",
    Canary = "canary",
    Dev = "dev"
}
export declare class RolloutConfigurationError extends Error {
    constructor(message: string);
}
/** Normalises a name the way both channels and feature names are normalised. */
export declare function normalise(value: string): string;
export declare function channelOrder(channel: RolloutChannel): number;
/** True when a copy on `have` is wide enough to include something needing `need`. */
export declare function channelAllows(have: RolloutChannel, need: RolloutChannel): boolean;
export declare function allChannels(): readonly RolloutChannel[];
/**
 * Reads a channel name.
 *
 * An unreadable name falls back to `stable` rather than throwing, because the
 * thing asking is usually a hook with one job and no way to report a
 * configuration error -- and falling back to the NARROWEST channel is the only
 * safe direction to guess in. `strict` is for the inspector and the tests, which
 * both exist to tell a user their configuration is wrong.
 *
 * The refusal is returned rather than logged. A warning on stderr from inside a
 * hook is either invisible or corrupts a protocol stream, so the caller decides
 * where it goes.
 */
export declare function parseChannel(value: string | undefined, options?: {
    readonly strict?: boolean;
}): {
    readonly channel: RolloutChannel;
    readonly refused: string | null;
};
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