/**
 * manually trigger a signal
 * @param {function} $signal
 * @returns
 */
export function triggerSignal($signal: Function): boolean;
export const subscribeSymbol: unique symbol;
export const triggerSymbol: unique symbol;
export function observeNow($signal: Function | any, callback: Function): Function | undefined;
export function observe($signal: Function | any, callback: Function, trigger?: boolean): Function | undefined;
export function subscribe($signal: Function | any, callback: Function, trigger?: boolean): Function | undefined;
export function isObservable(obj: any): boolean;
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