/**
 * Parse a string env var value into a boolean using the strtobool set:
 *
 *   truthy: 1 / true / t / yes / y / on
 *   falsy:  0 / false / f / no / n / off
 *
 * Case-insensitive. Leading / trailing whitespace tolerated. The set
 * is the same one Python's `distutils.util.strtobool` uses and that
 * envalid's `bool()` accepts. v1.17 B-03.
 *
 * On unrecognized non-empty input, emits a one-time stderr warning
 * naming the env var and falls back to `defaultValue`. The warning is
 * suppressed when `MEMORYDETECTIVE_SUPPRESS_PLATFORM_ADVISORY=1` is set
 * (consistent with the rest of our advisory plumbing).
 *
 * `varName` is required so the warning surfaces a useful message; pass
 * the literal env var name (e.g. "MEMORYDETECTIVE_AUTO_OPEN_INSTRUMENTS")
 * even if you read it from another source.
 */
export declare function parseBooleanEnv(raw: string | undefined, defaultValue: boolean, varName: string): boolean;
/** Test-only: reset the once-per-var warning flag set. */
export declare function resetParseBooleanEnvWarningsForTests(): void;