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'use strict';
const common = require('../common');
const Countdown = require('../common/countdown');
const assert = require('assert');
const immediate = setImmediate(() => {});
assert.strictEqual(immediate.hasRef(), true);
immediate.unref();
assert.strictEqual(immediate.hasRef(), false);
clearImmediate(immediate);
// This immediate should execute as it was unrefed and refed again.
// It also confirms that unref/ref are chainable.
setImmediate(common.mustCall(firstStep)).ref().unref().unref().ref();
function firstStep() {
const countdown =
new Countdown(2, common.mustCall(() => setImmediate(secondStep)));
// Unrefed setImmediate executes if it was unrefed but something else keeps
// the loop open
setImmediate(() => countdown.dec()).unref();
setTimeout(() => countdown.dec(), 50);
}
function secondStep() {
// clearImmediate works just fine with unref'd immediates
const immA = setImmediate(() => {
clearImmediate(immA);
clearImmediate(immB);
// This should not keep the event loop open indefinitely
// or do anything else weird
immA.ref();
immB.ref();
}).unref();
const immB = setImmediate(common.mustNotCall()).unref();
setImmediate(common.mustCall(finalStep));
}
function finalStep() {
// This immediate should not execute as it was unrefed
// and nothing else is keeping the event loop alive
setImmediate(common.mustNotCall()).unref();
}