/**
 * In-memory log sink for tests. Captures messages so tests can assert on log output.
 * Equivalent to Go's cre/testutils/test_writer.go.
 */
export declare class TestWriter {
    private logs;
    /** Appends a message to the captured log buffer. */
    log(message: string): void;
    /** Returns a copy of all captured log messages in order. */
    getLogs(): string[];
    /** Clears the captured log buffer. */
    clear(): void;
}