/**
 * The registration form, the two seats, and the screen every registration passes before admission:
 * shape, unique name, the seat × tier table, the `uses` declaration, and the `budgetMs` fallback.
 */
import { type ModBusSide, type ModEventName, type ModRegistrationTier, type ModSeat, type ModTier } from "./events.js";
import { type ModBudgetReading } from "./budget.js";
import type { ModEventPayload, ModFailureCause, ModMatcher, ModSkip } from "./site-rules.js";
/** The configuration refusal: a registration the kernel cannot take refuses the whole prepare. */
export declare const MODS_INVALID_CODE = "config.mods_invalid";
/** The notice an admission refusal becomes (the run goes on without the refused registration). */
export declare const MODS_REGISTRATION_REFUSED_CODE = "mods.registration_refused";
/** What a registration declares it will touch — the upper bound the kernel holds it to. */
export interface ModUses {
    /** Events it hangs handlers on (names or `<prefix>.*`). */
    readonly events: readonly string[];
    /** `$` methods it calls (method event names). */
    readonly calls: readonly string[];
}
/** Who raised a dispatch: a registration (through its `$`), or the engine (`{plugin: "engine", tier: "core"}`). */
export interface ModOrigin {
    readonly plugin: string;
    readonly tier: ModTier;
}
/** The engine's own origin; its `plugin` word is reserved (no registration may take it). */
export declare const ENGINE_ORIGIN: ModOrigin;
/** The facts `$.plugin` carries. */
export interface ModPluginFacts {
    readonly name: string;
}
/** The part of `$` every bus gives; each side adds its methods (`$.<noun>.<method>`). */
export interface ModDollarBase {
    readonly plugin: ModPluginFacts;
}
/** One entry of `next.trace`: a handler (or the core) that ran beneath, and how it ended. */
export interface ModTraceEntry {
    readonly index: number;
    readonly plugin: string;
    readonly tier: ModTier;
    readonly outcome: ModTraceOutcome;
    readonly ms: number;
}
/** How a chain member ended (CC words). */
export declare const MOD_TRACE_OUTCOMES: readonly ["returned", "passed", "rejected", "caught", "expired", "kept", "skipped", "bypassed"];
export type ModTraceOutcome = (typeof MOD_TRACE_OUTCOMES)[number];
/** What a `.catch` reads off `next.error`. */
export interface ModCaughtError {
    readonly kind: ModFailureCause;
    readonly message?: string;
    readonly budget: number;
}
/** The third argument of a handler: continue the chain, or jump (prepend / append only). */
export interface ModNext {
    (e: ModEventPayload): Promise<unknown>;
    to(e: ModEventPayload, tier: ModTier): Promise<unknown>;
    readonly origin: ModOrigin;
    readonly signal: AbortSignal;
    /** What ran beneath this handler's last `next`. */
    readonly trace: readonly ModTraceEntry[];
    readonly budget: ModBudgetReading;
    /** Present on a `.catch`'s `next` only. */
    readonly error?: ModCaughtError;
    /** Present on a `.catch`'s `next` only: whether the failed handler had called `next`. */
    readonly called?: boolean;
}
export type ModHandler<D extends ModDollarBase = ModDollarBase> = ($: D, e: ModEventPayload, next: ModNext) => unknown;
export interface ModHandlerOptions<D extends ModDollarBase = ModDollarBase> {
    /** Answers for the handler when it throws, runs out of budget or breaks the site's contract. */
    readonly catch?: ModHandler<D>;
    /** Watch only: a detached `e`, outside the chain, its answer refused and disclosed. */
    readonly observe?: boolean;
}
/** `on(pattern, handler, options?)` or `on(pattern, matcher, handler, options?)`. */
export interface On<D extends ModDollarBase = ModDollarBase> {
    (pattern: string, handler: ModHandler<D>, options?: ModHandlerOptions<D>): void;
    (pattern: string, matcher: ModMatcher, handler: ModHandler<D>, options?: ModHandlerOptions<D>): void;
}
export interface ModRegistration<D extends ModDollarBase = ModDollarBase> {
    /** Unique in the run; names the registration everywhere (origin, trace, disclosures, admission). */
    readonly name: string;
    /** Deployment seat: required. Task seat: absent or `user`. */
    readonly tier?: ModRegistrationTier;
    readonly uses: ModUses;
    /** The host's provenance label, handed to admission as given. */
    readonly provenance?: string;
    /** Each handler's own time; default 10 000 ms. */
    readonly budgetMs?: number;
    readonly options?: unknown;
    register(on: On<D>, options: unknown): void;
}
/** One admission result: mounted (with the patterns it actually hung) or refused (by whom, why). */
export type ModAdmissionRecord = {
    readonly name: string;
    readonly seat: ModSeat;
    readonly tier: ModTier;
    readonly events: readonly string[];
    readonly observe?: readonly string[];
    /** Judges skipped while this registration was judged (their failure or site violation), as the dispatch listed them. */
    readonly skipped?: readonly ModSkip[];
} | {
    readonly name: string;
    readonly seat: ModSeat;
    readonly tier: ModTier;
    readonly refusedBy: string;
    readonly reason: string;
};
/** The two seats as a bus receives them; a seat is a list of registrations or absent. Screened as untrusted input. */
export interface ModSeats<D extends ModDollarBase = ModDollarBase> {
    readonly deployment?: readonly ModRegistration<D>[];
    readonly task?: readonly ModRegistration<D>[];
}
/** A registration that passed the screen, in run order. */
export interface ScreenedRegistration<D extends ModDollarBase = ModDollarBase> {
    readonly registration: ModRegistration<D>;
    readonly name: string;
    readonly seat: ModSeat;
    readonly tier: ModRegistrationTier;
    readonly budgetMs: number;
    readonly uses: ModUses;
    readonly provenance?: string;
    readonly eventsBound: ReadonlySet<ModEventName>;
    readonly callsBound: ReadonlySet<ModEventName>;
}
export declare function modsInvalid(message: string): Error & {
    readonly code: string;
};
/**
 * Screen both seats and put the registrations in run order: by tier, then deployment before task, then
 * each seat's own order. Throws `config.mods_invalid` for anything the kernel cannot take; a bad
 * `budgetMs` is reported and replaced by the default instead.
 */
export declare function screenModSeats<D extends ModDollarBase>(seats: ModSeats<D>, side: ModBusSide, report: (err: Error) => void): ScreenedRegistration<D>[];