import type { LogSink } from './types.js';
/**
 * Delivers nothing, by construction. `createLogger`'s dispatch identity-
 * checks the configured sink against this exact reference and counts the
 * record as dropped rather than calling `emit` — a no-op `emit` and a real
 * delivery both return `undefined`, so without the identity check nothing
 * downstream could ever tell "configured to discard" from "silently eating
 * every record".
 */
export declare const NOOP_SINK: LogSink;
/**
 * One JSON object per line — the canonical wire format for the machine-read
 * path (`namzu run-stream`'s stderr). JSON string-escaping neutralises
 * `\n`/`\r` by construction, closing the log-forging surface without a
 * single character-stripping call site, which is bypassable anyway.
 *
 * `JSON.stringify` leaves U+2028 and U+2029 literal in its output, and some
 * readers — older V8, some log shippers — treat either codepoint as a line
 * terminator regardless of the JSON quoting around it. Escaped here so a
 * record can never masquerade as two lines to a reader that split on them.
 */
export declare function jsonLinesSink(stream: NodeJS.WritableStream): LogSink;
/**
 * Human-readable line, one record per line — the boot narrative's renderer.
 *
 * Three things it does that a generic sink does not, each answering a
 * specific half of "the logs tell me nothing":
 *
 * - **`+Nms` instead of an absolute timestamp.** Elapsed since the previous
 *   record ON THIS SINK, so the column reads as which phase was slow. The
 *   state is a closure variable rather than module-level: two sinks in one
 *   process each measure their own stream, and a shared `lastTimestamp`
 *   would make each one's deltas depend on the other's traffic.
 * - **A fixed-width scope column, coloured by a stable hash.** A dozen
 *   module initialisations read as structure rather than scroll.
 * - **A template per boot event**, so `info` shows the two attributes that
 *   matter rather than all forty as JSON.
 *
 * Colour is emitted only when the stream reports `isTTY`, so a redirected
 * log has no escape bytes in it at all.
 */
export declare function prettySink(stream: NodeJS.WritableStream): LogSink;
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