export interface ConfigWriteResult {
    success: boolean;
    content?: string;
    error?: string;
}
/**
 * Check whether a config key is in the whitelist.
 * Explicit keys and autoload/* patterns are accepted.
 */
export declare function isAllowedConfigKey(key: string): boolean;
/**
 * Validate a value against the rule for a given key.
 * Returns { valid: true } or { valid: false, error: "..." }.
 */
export declare function validateConfigValue(key: string, value: string): {
    valid: boolean;
    error?: string;
};
/**
 * Write a config key=value into project.godot content string.
 * Returns the modified content or an error.
 */
export declare function projectWriteConfig(content: string, key: string, value: string): ConfigWriteResult;