Encode

1import { Sink, type Writer } from "../src/writers/core.js";
2
3/**
4 * Encode a single value with `write` into a fresh {@link Sink} and return the
5 * bytes. The shared shape of every `*.write.test.ts`.
6 *
7 * Writer tests are INDEPENDENT of the readers: the test supplies the JS value
8 * itself and asserts the encoded bytes equal what ClickHouse emits (the source of
9 * truth, see `clickhouse.ts`) or a hard-coded expectation — never a value decoded
10 * by the reader. That way a reader bug cannot mask a writer bug, and vice versa.
11 *
12 * `capacity` sizes the (fixed-length) sink buffer; the default comfortably fits
13 * every value under test.
14 */
15export function encode<T>(write: Writer<T>, value: T, capacity = 4096): Buffer {
16  const sink = new Sink(Buffer.allocUnsafe(capacity));
17  write(sink, value);
18  return Buffer.from(sink.bytes());
19}