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import '../common/index.mjs';
import { Readable } from 'stream';
import { deepStrictEqual, rejects, throws } from 'assert';
{
// asIndexedPairs with a synchronous stream
const pairs = await Readable.from([1, 2, 3]).asIndexedPairs().toArray();
deepStrictEqual(pairs, [[0, 1], [1, 2], [2, 3]]);
const empty = await Readable.from([]).asIndexedPairs().toArray();
deepStrictEqual(empty, []);
}
{
// asIndexedPairs works an asynchronous streams
const asyncFrom = (...args) => Readable.from(...args).map(async (x) => x);
const pairs = await asyncFrom([1, 2, 3]).asIndexedPairs().toArray();
deepStrictEqual(pairs, [[0, 1], [1, 2], [2, 3]]);
const empty = await asyncFrom([]).asIndexedPairs().toArray();
deepStrictEqual(empty, []);
}
{
// Does not enumerate an infinite stream
const infinite = () => Readable.from(async function* () {
while (true) yield 1;
}());
const pairs = await infinite().asIndexedPairs().take(3).toArray();
deepStrictEqual(pairs, [[0, 1], [1, 1], [2, 1]]);
const empty = await infinite().asIndexedPairs().take(0).toArray();
deepStrictEqual(empty, []);
}
{
// AbortSignal
await rejects(async () => {
const ac = new AbortController();
const { signal } = ac;
const p = Readable.from([1, 2, 3]).asIndexedPairs({ signal }).toArray();
ac.abort();
await p;
}, { name: 'AbortError' });
await rejects(async () => {
const signal = AbortSignal.abort();
await Readable.from([1, 2, 3]).asIndexedPairs({ signal }).toArray();
}, /AbortError/);
}
{
// Error cases
throws(() => Readable.from([1]).asIndexedPairs(1), /ERR_INVALID_ARG_TYPE/);
throws(() => Readable.from([1]).asIndexedPairs({ signal: true }), /ERR_INVALID_ARG_TYPE/);
}
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