import { Injector, Signal, ValueEqualityFn, WritableSignal } from '@angular/core';
import { Path, PathValue, StateStore } from '@emuanalytics/flow-rdf-core';
export interface FlowSignalOptions<T> {
    /**
     * Name of signal to use in debugging.
     */
    name?: string;
    /**
     * If `true`, the signal will be writable and changes will be propagated to the state store.
     */
    writable?: boolean;
    /**
     * `Injector` which will provide the `DestroyRef` used to clean up the toStream subscription.
     *
     * If this is not provided, a `DestroyRef` will be retrieved from the current [injection
     * context](guide/di/dependency-injection-context), unless manual cleanup is requested.
     */
    injector?: Injector;
    /**
     * A comparison function which defines equality for values emitted by `toStream`.
     *
     * Equality comparisons are executed against the initial value if one is provided.
     */
    equal?: ValueEqualityFn<T>;
}
export declare function flowSignal<TState extends StateStore, P extends Path<TState, StateStore>>(state: TState, path: P): Signal<PathValue<TState, P, StateStore>>;
export declare function flowSignal<TState extends StateStore, P extends Path<TState, StateStore>>(state: TState, path: P, options: FlowSignalOptions<PathValue<TState, P, StateStore>> & {
    writable?: false;
}): Signal<PathValue<TState, P, StateStore>>;
export declare function flowSignal<TState extends StateStore, P extends Path<TState, StateStore>>(state: TState, path: P, options: FlowSignalOptions<PathValue<TState, P, StateStore>> & {
    writable: true;
}): WritableSignal<PathValue<TState, P, StateStore>>;
export declare function flowSignal<TState extends StateStore, R>(state: TState, path: (state: TState) => R): Signal<R>;
export declare function flowSignal<TState extends StateStore, R>(state: TState, path: (state: TState) => R, options: FlowSignalOptions<R> & {
    writable?: false;
}): Signal<R>;