/**
 * The structural logging port every call site in this package logs
 * through. Frozen at four two-arg methods (decision 0004 in the sibling
 * logging package's repo): a static message plus optional structured
 * context, with `data.err` reserved for an Error-ish value.
 */
export interface Logger {
    debug(msg: string, data?: Record<string, unknown>): void;
    info(msg: string, data?: Record<string, unknown>): void;
    warn(msg: string, data?: Record<string, unknown>): void;
    error(msg: string, data?: Record<string, unknown>): void;
}
/**
 * Installs `next` as the logger every call site in this package logs
 * through, forwards it to `@interop/was-sync` as well, and returns the
 * PREVIOUS logger of this package -- so a test (or an app reconfiguring at
 * runtime) can restore it.
 *
 * @param next {Logger}
 * @returns {Logger} the logger that was installed before this call.
 */
export declare function setLogger(next: Logger): Logger;
/**
 * The package-wide logger. Each method forwards to whichever logger is
 * currently installed, so call sites bound at import time still observe a
 * later {@link setLogger}.
 */
export declare const log: Logger;
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