import type { DreamuxEnvironment } from '@excitedjs/dreamux-types';
/** The process env a Codex app-server child spawns with, given its base env. */
export declare function codexSpawnEnv(baseEnv: DreamuxEnvironment, extraEnv?: Record<string, string>): NodeJS.ProcessEnv;
/**
 * The Codex home that applies for a given env: an explicit `CODEX_HOME`
 * override, else `$HOME/.codex` (falling back to the running process's own
 * home directory if the env carries no `HOME`). Pure and non-throwing — it
 * only says what path applies; a caller that needs existence/validity checks
 * (the activity reader, the doctor) layers its own error semantics on top.
 */
export declare function resolveCodexHomeDir(env: DreamuxEnvironment): string;
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