import type { DesktopPaths } from '../shared/types.js';
import type { ExternalRuntimeCandidate } from './runtime-service.js';
type ReadTextFile = (path: string, encoding: BufferEncoding) => string;
type StatFile = (path: string) => {
    size: number;
};
type ExecFile = (file: string, args: string[], options: {
    encoding: BufferEncoding;
    timeout: number;
    stdio: ['ignore', 'pipe', 'ignore'];
}) => string;
interface InstallEntry {
    binPath: string;
    root: string;
    pathEnv?: string;
}
export interface ExternalRuntimeDiscoveryDeps {
    binPaths?: string[];
    platform?: NodeJS.Platform;
    env?: NodeJS.ProcessEnv;
    execFileSync?: ExecFile;
    existsSync?: (path: string) => boolean;
    readFileSync?: ReadTextFile;
    realpathSync?: (path: string) => string;
    statSync?: StatFile;
}
export declare function discoverExternalRuntimeCandidate(paths: DesktopPaths, deps?: ExternalRuntimeDiscoveryDeps): ExternalRuntimeCandidate | null;
export declare function selectExternalRuntimeCandidate(entries: InstallEntry[], _paths: DesktopPaths, deps?: ExternalRuntimeDiscoveryDeps): ExternalRuntimeCandidate | null;
/**
 * Merged login+interactive shell PATH for GUI-launched processes (darwin only;
 * undefined elsewhere or when probing fails). The bundled-runtime daemon spawn
 * uses this so per-bot CLIs installed via nvm/fnm/homebrew stay findable —
 * PtyBackend spawns CLIs without any rc-sourcing shell wrapper, so whatever
 * PATH the daemon starts with is what `#!/usr/bin/env node` resolves against.
 */
export declare function probeShellPathEnv(): string | undefined;
export {};
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