import * as Effect from "effect/Effect";
import type { AppError } from "../app-error/index.js";
import type { InstallableExtensionType } from "../extensions/index.js";
import type { WorkspaceMutationsService } from "./service-interface.js";
/**
 * Determine installation from the observable workspace inventory. Lock
 * presence is intentionally irrelevant.
 */
export declare const isObservedInstalled: (workspace: WorkspaceMutationsService, type: InstallableExtensionType, name: string) => Effect.Effect<boolean, AppError>;
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