export type FeatureId = string | number;
export interface SourceSnapshot<TFeature> {
    readonly version: number;
    readonly features: readonly TFeature[];
}
/** Fine-grained mutation without a version (used inside `batch` payloads). */
export type FeatureSourceDelta<TFeature> = {
    readonly type: "add";
    readonly features: readonly TFeature[];
} | {
    readonly type: "update";
    readonly features: readonly TFeature[];
} | {
    readonly type: "remove";
    readonly ids: readonly FeatureId[];
};
export type FeatureSourceChange<TFeature> = {
    readonly type: "add";
    readonly features: readonly TFeature[];
    readonly version: number;
} | {
    readonly type: "update";
    readonly features: readonly TFeature[];
    readonly version: number;
} | {
    readonly type: "remove";
    readonly ids: readonly FeatureId[];
    readonly version: number;
} | {
    readonly type: "batch";
    readonly version: number;
    readonly changes: readonly FeatureSourceDelta<TFeature>[];
} | {
    readonly type: "reset";
    readonly version: number;
};
export type FeatureSourceListener<TFeature> = (change: FeatureSourceChange<TFeature>) => void;
/** Read-only structural protocol consumed by renderer layers. */
export interface ReadonlyFeatureSource<TFeature = unknown> {
    getSnapshot(): SourceSnapshot<TFeature>;
    subscribe(listener: FeatureSourceListener<TFeature>): () => void;
}
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