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37 lines
1.1 KiB
37 lines
1.1 KiB
2 years ago
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var now = require('./now');
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exports = function(condition) {
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var timeout =
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arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
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var interval =
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arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 250;
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function evalCondition() {
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return new Promise(function(resolve, reject) {
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try {
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resolve(condition());
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} catch (e) {
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reject(e);
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}
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});
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}
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return new Promise(function(resolve, reject) {
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var startTime = now();
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var pollCondition = function() {
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evalCondition().then(function(val) {
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var elapsed = now() - startTime;
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if (val) {
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resolve(val);
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} else if (timeout && elapsed >= timeout) {
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reject(
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Error('Wait timed out after '.concat(timeout, ' ms'))
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);
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} else {
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setTimeout(pollCondition, interval);
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}
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}, reject);
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};
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pollCondition();
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});
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};
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module.exports = exports;
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