export interface BooleanEnvOverrideOptions {
    /** The environment variable's name, for the error message. */
    envName: string;
    /** The config key's name, for the error message. */
    configName: string;
    envValue: string | undefined;
    configValue: unknown;
    /** Used when neither the environment nor the config sets the flag. */
    defaultValue: boolean;
}
/**
 * The one rule behind every daemon boolean flag whose environment variable
 * overrides its config key:
 *
 * - a SET environment variable wins and must read 1, 0, true or false (case
 *   and surrounding whitespace ignored). Anything else, the empty string
 *   included, throws so startup fails instead of silently picking a side;
 * - otherwise a config value must be a boolean;
 * - otherwise `defaultValue`.
 */
export declare function resolveBooleanEnvOverride(options: BooleanEnvOverrideOptions): boolean;
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