posthog-js/lib/src/extensions/types.d.ts

Posthog-js allows you to automatically capture usage and send events to PostHog.

import type { PostHog } from '../posthog-core';
import type { RemoteConfigResult } from '../types';
export type ExtensionConstructor<T extends Extension> = new (instance: PostHog, ...args: any[]) => T;
export interface Extension {
    initialize?(): boolean | void;
    /**
     * Receives the full remote config fetch result. Handlers must narrow on
     * `result.ok` before reading config fields, and encode their failure
     * behavior explicitly in the `!result.ok` branch.
     */
    onRemoteConfig?(result: RemoteConfigResult): void;
}