import { type KeychainIO } from './claude-keychain-write.js';
/** Mutate `env` in place to authenticate a darwin-spawned claude, then return it.
 *  No-op on every other platform and when `claudeConfigDir` is empty. On darwin
 *  with a valid credentials file it write-through the full blob to the Keychain
 *  and skips the env token; on an unresolved item or write failure it injects the
 *  token instead. When `logger` is passed, emits one `op=spawn-hostcreds` line and
 *  one `op=connector-availability` verdict. `io` is injected for tests. */
export declare function applyHostCredsEnv(env: NodeJS.ProcessEnv, claudeConfigDir: string, platform?: NodeJS.Platform, logger?: (line: string) => void, io?: KeychainIO): NodeJS.ProcessEnv;
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