export type EventType = "compile-started" | "compile-compiled" | "compile-errored" | "lint-linted" | "lint-errored" | "format-verified" | "format-errored" | "source-files-changed" | "report";
export type Callback = (info?: Report) => void;
export interface Report {
    tool: "format" | "lint" | "test" | "coverage" | "compiler";
    status: "ready" | "busy";
    errors?: number;
    fixable?: number;
}
export interface Bus {
    signal(eventType: EventType): void;
    report(report: Report): void;
    register(type: EventType, callback: Callback): void;
    registerAll(types: EventType[], callback: Callback): void;
    unregister(callback: Callback): void;
}
export declare let createBus: () => Bus;