/**
 * Env Loader Utility
 * Loads known AI provider API keys from .ralph/.env.local into process.env
 */
/**
 * Parse dotenv-style content into a key-value map.
 * - Ignores empty lines and comments (lines starting with #).
 * - Ignores malformed lines without `=`.
 * - Treats everything after the first `=` as the value.
 * - Trims whitespace around keys and values.
 * - Strips matching surrounding quotes (single or double) from values.
 */
export declare function parseEnvContent(content: string): Record<string, string>;
/**
 * Write API keys to an env file, preserving existing content.
 *
 * - Merges keys into existing file content (preserves other keys).
 * - Replaces existing key values if the key already exists.
 * - Creates parent directories if they don't exist.
 * - Creates the file if it doesn't exist.
 * - Skips empty values (keys with empty strings are ignored).
 *
 * @param filePath - Absolute path to the .env.local file
 * @param keys - Record of environment variable names to values
 */
export declare function writeKeysToEnvFile(filePath: string, keys: Record<string, string>): void;
/**
 * Load known AI provider API keys from .ralph/.env.local into process.env.
 *
 * - Prefers .ralph/.env.local as the canonical source (if it exists).
 * - Falls back to root .env.local if .ralph/.env.local does not exist (backward compatibility).
 * - Only keys in KNOWN_API_KEYS are loaded; all others are ignored.
 * - File values override existing process.env values (file takes precedence).
 * - If neither file exists or cannot be read, this is a silent no-op.
 * - Malformed lines are skipped without aborting.
 */
export declare function loadApiKeysFromEnvLocal(): void;