export declare const PROTOCOL_VERSION: 1;
export type CorrelationId = string & {
    readonly __correlationId: unique symbol;
};
export type Capability = "Http" | "Storage" | "Clipboard" | "Navigation";
export type SemanticEvent = {
    readonly kind: "Event";
    readonly name: string;
    readonly key?: string;
    readonly value?: string;
};
export type BrowserLocation = {
    readonly origin: string;
    readonly path: string;
    readonly query: string;
    readonly hash: string;
};
export type EffectOutcome = {
    readonly kind: "Success";
    readonly status: number;
    readonly body: unknown;
} | {
    readonly kind: "Failure";
    readonly reason: "network" | "aborted" | "invalid-response";
    readonly status?: number;
} | {
    readonly kind: "Cancelled";
} | {
    readonly kind: "OutcomeUnknown";
    readonly reason: "timeout-after-dispatch";
};
export type StorageOutcome = {
    readonly kind: "Success";
    readonly value: string | null;
} | {
    readonly kind: "Failure";
    readonly reason: "unavailable" | "quota-exceeded";
};
export type ClipboardOutcome = {
    readonly kind: "Success";
} | {
    readonly kind: "Failure";
    readonly reason: "denied" | "unavailable" | "unknown";
};
export type NavigationOutcome = {
    readonly kind: "Success";
    readonly location: BrowserLocation;
} | {
    readonly kind: "Dispatched";
} | {
    readonly kind: "Failure";
    readonly reason: "unavailable" | "not-same-origin";
};
export type EffectResult = {
    readonly kind: "HttpResult";
    readonly correlationId: CorrelationId;
    readonly outcome: EffectOutcome;
} | {
    readonly kind: "StorageResult";
    readonly correlationId: CorrelationId;
    readonly outcome: StorageOutcome;
} | {
    readonly kind: "ClipboardResult";
    readonly correlationId: CorrelationId;
    readonly outcome: ClipboardOutcome;
} | {
    readonly kind: "NavigationResult";
    readonly correlationId: CorrelationId;
    readonly outcome: NavigationOutcome;
};
export type BrowserToEngineMessage = {
    readonly kind: "Initialize";
    readonly protocolVersion: typeof PROTOCOL_VERSION;
    readonly capabilities: readonly Capability[];
    readonly location: BrowserLocation;
} | {
    readonly kind: "Event";
    readonly event: SemanticEvent;
} | {
    readonly kind: "EffectResult";
    readonly result: EffectResult;
} | {
    readonly kind: "LocationChanged";
    readonly location: BrowserLocation;
};
export type ViewPrimitive = string | number | boolean;
export type ViewItem = {
    readonly [field: string]: ViewPrimitive;
};
export type ViewValue = ViewPrimitive | readonly ViewItem[];
export type ViewState = {
    readonly [key: string]: ViewValue;
};
export type HttpMethod = "GET" | "PUT" | "POST" | "PATCH" | "DELETE";
export type HttpEffectRequest = {
    readonly kind: "Http";
    readonly correlationId: CorrelationId;
    readonly method: HttpMethod;
    readonly url: string;
    readonly headers?: Readonly<Record<string, string>>;
    readonly body?: string;
    readonly timeoutMs: number;
};
export type StorageEffectRequest = {
    readonly kind: "Storage";
    readonly correlationId: CorrelationId;
    readonly operation: "get";
    readonly key: string;
} | {
    readonly kind: "Storage";
    readonly correlationId: CorrelationId;
    readonly operation: "set";
    readonly key: string;
    readonly value: string;
} | {
    readonly kind: "Storage";
    readonly correlationId: CorrelationId;
    readonly operation: "remove";
    readonly key: string;
};
export type ClipboardEffectRequest = {
    readonly kind: "Clipboard";
    readonly correlationId: CorrelationId;
    readonly operation: "writeText";
    readonly text: string;
};
export type NavigationEffectRequest = {
    readonly kind: "Navigation";
    readonly correlationId: CorrelationId;
    readonly operation: "push";
    readonly url: string;
} | {
    readonly kind: "Navigation";
    readonly correlationId: CorrelationId;
    readonly operation: "replace";
    readonly url: string;
} | {
    readonly kind: "Navigation";
    readonly correlationId: CorrelationId;
    readonly operation: "back";
} | {
    readonly kind: "Navigation";
    readonly correlationId: CorrelationId;
    readonly operation: "forward";
};
export type EffectRequest = HttpEffectRequest | StorageEffectRequest | ClipboardEffectRequest | NavigationEffectRequest;
export type EngineToBrowserMessage = {
    readonly view: ViewState;
    readonly effects: readonly EffectRequest[];
    readonly cancellations: readonly CorrelationId[];
};
export interface EngineTransport {
    start(): Promise<void>;
    dispatch(message: BrowserToEngineMessage): Promise<EngineToBrowserMessage>;
}
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