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spec/async-spec-helpers.js
45 строк
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Amin Yahyaabadi
support sync conditions
21 янв 2021, 21:20
21 янв 2021, 21:20
12ddf94
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async function conditionPromise( condition, description = 'anonymous condition' ) { const startTime = Date.now(); while (true) { await timeoutPromise(100); // if condition is sync if (condition.constructor.name !== 'AsyncFunction' && condition()) { return; } // if condition is async else if (await condition()) { return; } if (Date.now() - startTime > 5000) { throw new Error('Timed out waiting on ' + description); } } } function timeoutPromise(timeout) { return new Promise(resolve => { global.setTimeout(resolve, timeout); }); } function emitterEventPromise(emitter, event, timeout = 15000) { return new Promise((resolve, reject) => { const timeoutHandle = setTimeout(() => { reject(new Error(`Timed out waiting for '${event}' event`)); }, timeout); emitter.once(event, () => { clearTimeout(timeoutHandle); resolve(); }); }); } exports.conditionPromise = conditionPromise; exports.emitterEventPromise = emitterEventPromise; exports.timeoutPromise = timeoutPromise;